The Experts below are selected from a list of 2913 Experts worldwide ranked by ideXlab platform
Jun Zhou - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of b4c 6061al Neutron Absorber composite tube fabricated by spark plasma sintering and hot spinning
Journal of Nuclear Materials, 2019Co-Authors: Hongsheng Chen, H. H. Nie, W X Wang, Jun Zhou, Peng Zhang, Yuyang Zhang, Jinfeng Wang, Run Feng LiuAbstract:Abstract In this study, a B4C/6061Al Neutron Absorber composite (NAC) tube containing 5 wt.% B4C particle was first fabricated by spark plasma sintering (SPS) followed by hot spinning (HS), then its microstructure and mechanical properties were experimentally investigated. It was found that, through spinning, B4C particles were better distributed in the 6061 Al matrix and the bonding of the B4C/6061Al matrix interface was improved. Dislocation pileups around B4C particles and dislocation loops were both observed. B4C particles could promote dynamic recrystallized nucleation and pin grain boundaries, resulting in grain refinement in the material. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the spinned composite tube were found higher than that of the SPSed composite tube. The strength improvement of the fabricated B4C/6061Al Neutron Absorber composite tube was mainly due to the dislocation strengthening mechanism and grain refinement through spinning.
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Microstructure and mechanical properties of B4C/6061Al Neutron Absorber composite tube fabricated by spark plasma sintering and hot spinning
Journal of Nuclear Materials, 2019Co-Authors: Hongsheng Chen, H. H. Nie, W X Wang, Jun Zhou, Peng Zhang, Zhang Yuyang, Wang Jinfeng, Run Feng LiuAbstract:Abstract In this study, a B4C/6061Al Neutron Absorber composite (NAC) tube containing 5 wt.% B4C particle was first fabricated by spark plasma sintering (SPS) followed by hot spinning (HS), then its microstructure and mechanical properties were experimentally investigated. It was found that, through spinning, B4C particles were better distributed in the 6061 Al matrix and the bonding of the B4C/6061Al matrix interface was improved. Dislocation pileups around B4C particles and dislocation loops were both observed. B4C particles could promote dynamic recrystallized nucleation and pin grain boundaries, resulting in grain refinement in the material. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the spinned composite tube were found higher than that of the SPSed composite tube. The strength improvement of the fabricated B4C/6061Al Neutron Absorber composite tube was mainly due to the dislocation strengthening mechanism and grain refinement through spinning.
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the dynamic properties of b4c 6061al Neutron Absorber composites fabricated by power metallurgy
Materials Science and Technology, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Peng ZhangAbstract:ABSTRACTThe dynamic compression properties of B4C/6061Al Neutron Absorber composites (NACs) with three B4C volume fractions (20–40%), fabricated by power metallurgy, were studied. Compression tests were conducted at strain rates ranging from 760 to 1150 s−1, using a split Hopkinson pressure bar. The damage mechanism was studied through microstructural analysis. Results show that the B4C particles exhibited a uniform distribution in the 6061Al matrix. The NACs dynamic strength was found to improve with increasing quantities of B4C particles, and with strain rate. The damage mechanisms include particle fracture and interface debonding. Dislocation pile-up was observed at grain boundaries and at the interface between particles and the matrix. A constitutive model under dynamic compression was developed based on the Johnson–Cook model.This paper is part of a thematic issue on Nuclear Materials.
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microstructure evolution and mechanical properties of b4c 6061al Neutron Absorber composite sheets fabricated by powder metallurgy
Journal of Alloys and Compounds, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Ruixiang Liu, Yan Zhang, Peng ZhangAbstract:Abstract B4C particle reinforced 6061Al matrix composites is interestingly used for Neutron shielding due to its light weight and good strength and Neutron absorbing. In this study, B4C/6061Al Neutron Absorber composite (B4C/6061Al NAC) sheet containing 30 wt% B4C particle was first fabricated by powder metallurgy (hot pressed sintering→extrusion→rolling), then its microstructure and mechanical properties were investigated. It was found that B4C particles distributed relatively homogeneously in the 6061Al matrix and the composite was mainly consisted of B4C, Al and Al2O3 phases. B4C particles were found to be able to stimulate dynamic recrystallization (DRX) nucleation; restrain the grain growth; and reduce the preferential orientation of the aluminum grains. Moreover, under increasing deformation, amount of DRX was found to increases; the ultimate tensile and yield strength of the composites first increased and then decreased; while its elongation to fracture dropped. The decrease in strength was found to be due to the fracture of large B4C particles and the stress concentration in the locations between the B4C particle and the 6061Al matrix.
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Microstructure evolution and mechanical properties of B4C/6061Al Neutron Absorber composite sheets fabricated by powder metallurgy
Journal of Alloys and Compounds, 2018Co-Authors: Chen Hongsheng, H. H. Nie, Jun Zhou, Wenxian Wang, Ruixiang Liu, Yan Zhang, Peng ZhangAbstract:Abstract B4C particle reinforced 6061Al matrix composites is interestingly used for Neutron shielding due to its light weight and good strength and Neutron absorbing. In this study, B4C/6061Al Neutron Absorber composite (B4C/6061Al NAC) sheet containing 30 wt% B4C particle was first fabricated by powder metallurgy (hot pressed sintering→extrusion→rolling), then its microstructure and mechanical properties were investigated. It was found that B4C particles distributed relatively homogeneously in the 6061Al matrix and the composite was mainly consisted of B4C, Al and Al2O3 phases. B4C particles were found to be able to stimulate dynamic recrystallization (DRX) nucleation; restrain the grain growth; and reduce the preferential orientation of the aluminum grains. Moreover, under increasing deformation, amount of DRX was found to increases; the ultimate tensile and yield strength of the composites first increased and then decreased; while its elongation to fracture dropped. The decrease in strength was found to be due to the fracture of large B4C particles and the stress concentration in the locations between the B4C particle and the 6061Al matrix.
Hongsheng Chen - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of b4c 6061al Neutron Absorber composite tube fabricated by spark plasma sintering and hot spinning
Journal of Nuclear Materials, 2019Co-Authors: Hongsheng Chen, H. H. Nie, W X Wang, Jun Zhou, Peng Zhang, Yuyang Zhang, Jinfeng Wang, Run Feng LiuAbstract:Abstract In this study, a B4C/6061Al Neutron Absorber composite (NAC) tube containing 5 wt.% B4C particle was first fabricated by spark plasma sintering (SPS) followed by hot spinning (HS), then its microstructure and mechanical properties were experimentally investigated. It was found that, through spinning, B4C particles were better distributed in the 6061 Al matrix and the bonding of the B4C/6061Al matrix interface was improved. Dislocation pileups around B4C particles and dislocation loops were both observed. B4C particles could promote dynamic recrystallized nucleation and pin grain boundaries, resulting in grain refinement in the material. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the spinned composite tube were found higher than that of the SPSed composite tube. The strength improvement of the fabricated B4C/6061Al Neutron Absorber composite tube was mainly due to the dislocation strengthening mechanism and grain refinement through spinning.
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Microstructure and mechanical properties of B4C/6061Al Neutron Absorber composite tube fabricated by spark plasma sintering and hot spinning
Journal of Nuclear Materials, 2019Co-Authors: Hongsheng Chen, H. H. Nie, W X Wang, Jun Zhou, Peng Zhang, Zhang Yuyang, Wang Jinfeng, Run Feng LiuAbstract:Abstract In this study, a B4C/6061Al Neutron Absorber composite (NAC) tube containing 5 wt.% B4C particle was first fabricated by spark plasma sintering (SPS) followed by hot spinning (HS), then its microstructure and mechanical properties were experimentally investigated. It was found that, through spinning, B4C particles were better distributed in the 6061 Al matrix and the bonding of the B4C/6061Al matrix interface was improved. Dislocation pileups around B4C particles and dislocation loops were both observed. B4C particles could promote dynamic recrystallized nucleation and pin grain boundaries, resulting in grain refinement in the material. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the spinned composite tube were found higher than that of the SPSed composite tube. The strength improvement of the fabricated B4C/6061Al Neutron Absorber composite tube was mainly due to the dislocation strengthening mechanism and grain refinement through spinning.
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the dynamic properties of b4c 6061al Neutron Absorber composites fabricated by power metallurgy
Materials Science and Technology, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Peng ZhangAbstract:ABSTRACTThe dynamic compression properties of B4C/6061Al Neutron Absorber composites (NACs) with three B4C volume fractions (20–40%), fabricated by power metallurgy, were studied. Compression tests were conducted at strain rates ranging from 760 to 1150 s−1, using a split Hopkinson pressure bar. The damage mechanism was studied through microstructural analysis. Results show that the B4C particles exhibited a uniform distribution in the 6061Al matrix. The NACs dynamic strength was found to improve with increasing quantities of B4C particles, and with strain rate. The damage mechanisms include particle fracture and interface debonding. Dislocation pile-up was observed at grain boundaries and at the interface between particles and the matrix. A constitutive model under dynamic compression was developed based on the Johnson–Cook model.This paper is part of a thematic issue on Nuclear Materials.
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microstructure evolution and mechanical properties of b4c 6061al Neutron Absorber composite sheets fabricated by powder metallurgy
Journal of Alloys and Compounds, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Ruixiang Liu, Yan Zhang, Peng ZhangAbstract:Abstract B4C particle reinforced 6061Al matrix composites is interestingly used for Neutron shielding due to its light weight and good strength and Neutron absorbing. In this study, B4C/6061Al Neutron Absorber composite (B4C/6061Al NAC) sheet containing 30 wt% B4C particle was first fabricated by powder metallurgy (hot pressed sintering→extrusion→rolling), then its microstructure and mechanical properties were investigated. It was found that B4C particles distributed relatively homogeneously in the 6061Al matrix and the composite was mainly consisted of B4C, Al and Al2O3 phases. B4C particles were found to be able to stimulate dynamic recrystallization (DRX) nucleation; restrain the grain growth; and reduce the preferential orientation of the aluminum grains. Moreover, under increasing deformation, amount of DRX was found to increases; the ultimate tensile and yield strength of the composites first increased and then decreased; while its elongation to fracture dropped. The decrease in strength was found to be due to the fracture of large B4C particles and the stress concentration in the locations between the B4C particle and the 6061Al matrix.
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The dynamic properties of B4C/6061Al Neutron Absorber composites fabricated by power metallurgy
Materials Science and Technology, 2017Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Peng ZhangAbstract:ABSTRACTThe dynamic compression properties of B4C/6061Al Neutron Absorber composites (NACs) with three B4C volume fractions (20–40%), fabricated by power metallurgy, were studied. Compression tests were conducted at strain rates ranging from 760 to 1150 s−1, using a split Hopkinson pressure bar. The damage mechanism was studied through microstructural analysis. Results show that the B4C particles exhibited a uniform distribution in the 6061Al matrix. The NACs dynamic strength was found to improve with increasing quantities of B4C particles, and with strain rate. The damage mechanisms include particle fracture and interface debonding. Dislocation pile-up was observed at grain boundaries and at the interface between particles and the matrix. A constitutive model under dynamic compression was developed based on the Johnson–Cook model.This paper is part of a thematic issue on Nuclear Materials.
H. H. Nie - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of b4c 6061al Neutron Absorber composite tube fabricated by spark plasma sintering and hot spinning
Journal of Nuclear Materials, 2019Co-Authors: Hongsheng Chen, H. H. Nie, W X Wang, Jun Zhou, Peng Zhang, Yuyang Zhang, Jinfeng Wang, Run Feng LiuAbstract:Abstract In this study, a B4C/6061Al Neutron Absorber composite (NAC) tube containing 5 wt.% B4C particle was first fabricated by spark plasma sintering (SPS) followed by hot spinning (HS), then its microstructure and mechanical properties were experimentally investigated. It was found that, through spinning, B4C particles were better distributed in the 6061 Al matrix and the bonding of the B4C/6061Al matrix interface was improved. Dislocation pileups around B4C particles and dislocation loops were both observed. B4C particles could promote dynamic recrystallized nucleation and pin grain boundaries, resulting in grain refinement in the material. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the spinned composite tube were found higher than that of the SPSed composite tube. The strength improvement of the fabricated B4C/6061Al Neutron Absorber composite tube was mainly due to the dislocation strengthening mechanism and grain refinement through spinning.
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Microstructure and mechanical properties of B4C/6061Al Neutron Absorber composite tube fabricated by spark plasma sintering and hot spinning
Journal of Nuclear Materials, 2019Co-Authors: Hongsheng Chen, H. H. Nie, W X Wang, Jun Zhou, Peng Zhang, Zhang Yuyang, Wang Jinfeng, Run Feng LiuAbstract:Abstract In this study, a B4C/6061Al Neutron Absorber composite (NAC) tube containing 5 wt.% B4C particle was first fabricated by spark plasma sintering (SPS) followed by hot spinning (HS), then its microstructure and mechanical properties were experimentally investigated. It was found that, through spinning, B4C particles were better distributed in the 6061 Al matrix and the bonding of the B4C/6061Al matrix interface was improved. Dislocation pileups around B4C particles and dislocation loops were both observed. B4C particles could promote dynamic recrystallized nucleation and pin grain boundaries, resulting in grain refinement in the material. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the spinned composite tube were found higher than that of the SPSed composite tube. The strength improvement of the fabricated B4C/6061Al Neutron Absorber composite tube was mainly due to the dislocation strengthening mechanism and grain refinement through spinning.
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the dynamic properties of b4c 6061al Neutron Absorber composites fabricated by power metallurgy
Materials Science and Technology, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Peng ZhangAbstract:ABSTRACTThe dynamic compression properties of B4C/6061Al Neutron Absorber composites (NACs) with three B4C volume fractions (20–40%), fabricated by power metallurgy, were studied. Compression tests were conducted at strain rates ranging from 760 to 1150 s−1, using a split Hopkinson pressure bar. The damage mechanism was studied through microstructural analysis. Results show that the B4C particles exhibited a uniform distribution in the 6061Al matrix. The NACs dynamic strength was found to improve with increasing quantities of B4C particles, and with strain rate. The damage mechanisms include particle fracture and interface debonding. Dislocation pile-up was observed at grain boundaries and at the interface between particles and the matrix. A constitutive model under dynamic compression was developed based on the Johnson–Cook model.This paper is part of a thematic issue on Nuclear Materials.
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microstructure evolution and mechanical properties of b4c 6061al Neutron Absorber composite sheets fabricated by powder metallurgy
Journal of Alloys and Compounds, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Ruixiang Liu, Yan Zhang, Peng ZhangAbstract:Abstract B4C particle reinforced 6061Al matrix composites is interestingly used for Neutron shielding due to its light weight and good strength and Neutron absorbing. In this study, B4C/6061Al Neutron Absorber composite (B4C/6061Al NAC) sheet containing 30 wt% B4C particle was first fabricated by powder metallurgy (hot pressed sintering→extrusion→rolling), then its microstructure and mechanical properties were investigated. It was found that B4C particles distributed relatively homogeneously in the 6061Al matrix and the composite was mainly consisted of B4C, Al and Al2O3 phases. B4C particles were found to be able to stimulate dynamic recrystallization (DRX) nucleation; restrain the grain growth; and reduce the preferential orientation of the aluminum grains. Moreover, under increasing deformation, amount of DRX was found to increases; the ultimate tensile and yield strength of the composites first increased and then decreased; while its elongation to fracture dropped. The decrease in strength was found to be due to the fracture of large B4C particles and the stress concentration in the locations between the B4C particle and the 6061Al matrix.
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Microstructure evolution and mechanical properties of B4C/6061Al Neutron Absorber composite sheets fabricated by powder metallurgy
Journal of Alloys and Compounds, 2018Co-Authors: Chen Hongsheng, H. H. Nie, Jun Zhou, Wenxian Wang, Ruixiang Liu, Yan Zhang, Peng ZhangAbstract:Abstract B4C particle reinforced 6061Al matrix composites is interestingly used for Neutron shielding due to its light weight and good strength and Neutron absorbing. In this study, B4C/6061Al Neutron Absorber composite (B4C/6061Al NAC) sheet containing 30 wt% B4C particle was first fabricated by powder metallurgy (hot pressed sintering→extrusion→rolling), then its microstructure and mechanical properties were investigated. It was found that B4C particles distributed relatively homogeneously in the 6061Al matrix and the composite was mainly consisted of B4C, Al and Al2O3 phases. B4C particles were found to be able to stimulate dynamic recrystallization (DRX) nucleation; restrain the grain growth; and reduce the preferential orientation of the aluminum grains. Moreover, under increasing deformation, amount of DRX was found to increases; the ultimate tensile and yield strength of the composites first increased and then decreased; while its elongation to fracture dropped. The decrease in strength was found to be due to the fracture of large B4C particles and the stress concentration in the locations between the B4C particle and the 6061Al matrix.
Peng Zhang - One of the best experts on this subject based on the ideXlab platform.
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microstructure and mechanical properties of b4c 6061al Neutron Absorber composite tube fabricated by spark plasma sintering and hot spinning
Journal of Nuclear Materials, 2019Co-Authors: Hongsheng Chen, H. H. Nie, W X Wang, Jun Zhou, Peng Zhang, Yuyang Zhang, Jinfeng Wang, Run Feng LiuAbstract:Abstract In this study, a B4C/6061Al Neutron Absorber composite (NAC) tube containing 5 wt.% B4C particle was first fabricated by spark plasma sintering (SPS) followed by hot spinning (HS), then its microstructure and mechanical properties were experimentally investigated. It was found that, through spinning, B4C particles were better distributed in the 6061 Al matrix and the bonding of the B4C/6061Al matrix interface was improved. Dislocation pileups around B4C particles and dislocation loops were both observed. B4C particles could promote dynamic recrystallized nucleation and pin grain boundaries, resulting in grain refinement in the material. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the spinned composite tube were found higher than that of the SPSed composite tube. The strength improvement of the fabricated B4C/6061Al Neutron Absorber composite tube was mainly due to the dislocation strengthening mechanism and grain refinement through spinning.
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Microstructure and mechanical properties of B4C/6061Al Neutron Absorber composite tube fabricated by spark plasma sintering and hot spinning
Journal of Nuclear Materials, 2019Co-Authors: Hongsheng Chen, H. H. Nie, W X Wang, Jun Zhou, Peng Zhang, Zhang Yuyang, Wang Jinfeng, Run Feng LiuAbstract:Abstract In this study, a B4C/6061Al Neutron Absorber composite (NAC) tube containing 5 wt.% B4C particle was first fabricated by spark plasma sintering (SPS) followed by hot spinning (HS), then its microstructure and mechanical properties were experimentally investigated. It was found that, through spinning, B4C particles were better distributed in the 6061 Al matrix and the bonding of the B4C/6061Al matrix interface was improved. Dislocation pileups around B4C particles and dislocation loops were both observed. B4C particles could promote dynamic recrystallized nucleation and pin grain boundaries, resulting in grain refinement in the material. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the spinned composite tube were found higher than that of the SPSed composite tube. The strength improvement of the fabricated B4C/6061Al Neutron Absorber composite tube was mainly due to the dislocation strengthening mechanism and grain refinement through spinning.
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the dynamic properties of b4c 6061al Neutron Absorber composites fabricated by power metallurgy
Materials Science and Technology, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Peng ZhangAbstract:ABSTRACTThe dynamic compression properties of B4C/6061Al Neutron Absorber composites (NACs) with three B4C volume fractions (20–40%), fabricated by power metallurgy, were studied. Compression tests were conducted at strain rates ranging from 760 to 1150 s−1, using a split Hopkinson pressure bar. The damage mechanism was studied through microstructural analysis. Results show that the B4C particles exhibited a uniform distribution in the 6061Al matrix. The NACs dynamic strength was found to improve with increasing quantities of B4C particles, and with strain rate. The damage mechanisms include particle fracture and interface debonding. Dislocation pile-up was observed at grain boundaries and at the interface between particles and the matrix. A constitutive model under dynamic compression was developed based on the Johnson–Cook model.This paper is part of a thematic issue on Nuclear Materials.
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microstructure evolution and mechanical properties of b4c 6061al Neutron Absorber composite sheets fabricated by powder metallurgy
Journal of Alloys and Compounds, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Ruixiang Liu, Yan Zhang, Peng ZhangAbstract:Abstract B4C particle reinforced 6061Al matrix composites is interestingly used for Neutron shielding due to its light weight and good strength and Neutron absorbing. In this study, B4C/6061Al Neutron Absorber composite (B4C/6061Al NAC) sheet containing 30 wt% B4C particle was first fabricated by powder metallurgy (hot pressed sintering→extrusion→rolling), then its microstructure and mechanical properties were investigated. It was found that B4C particles distributed relatively homogeneously in the 6061Al matrix and the composite was mainly consisted of B4C, Al and Al2O3 phases. B4C particles were found to be able to stimulate dynamic recrystallization (DRX) nucleation; restrain the grain growth; and reduce the preferential orientation of the aluminum grains. Moreover, under increasing deformation, amount of DRX was found to increases; the ultimate tensile and yield strength of the composites first increased and then decreased; while its elongation to fracture dropped. The decrease in strength was found to be due to the fracture of large B4C particles and the stress concentration in the locations between the B4C particle and the 6061Al matrix.
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Microstructure evolution and mechanical properties of B4C/6061Al Neutron Absorber composite sheets fabricated by powder metallurgy
Journal of Alloys and Compounds, 2018Co-Authors: Chen Hongsheng, H. H. Nie, Jun Zhou, Wenxian Wang, Ruixiang Liu, Yan Zhang, Peng ZhangAbstract:Abstract B4C particle reinforced 6061Al matrix composites is interestingly used for Neutron shielding due to its light weight and good strength and Neutron absorbing. In this study, B4C/6061Al Neutron Absorber composite (B4C/6061Al NAC) sheet containing 30 wt% B4C particle was first fabricated by powder metallurgy (hot pressed sintering→extrusion→rolling), then its microstructure and mechanical properties were investigated. It was found that B4C particles distributed relatively homogeneously in the 6061Al matrix and the composite was mainly consisted of B4C, Al and Al2O3 phases. B4C particles were found to be able to stimulate dynamic recrystallization (DRX) nucleation; restrain the grain growth; and reduce the preferential orientation of the aluminum grains. Moreover, under increasing deformation, amount of DRX was found to increases; the ultimate tensile and yield strength of the composites first increased and then decreased; while its elongation to fracture dropped. The decrease in strength was found to be due to the fracture of large B4C particles and the stress concentration in the locations between the B4C particle and the 6061Al matrix.
Wenxian Wang - One of the best experts on this subject based on the ideXlab platform.
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the dynamic properties of b4c 6061al Neutron Absorber composites fabricated by power metallurgy
Materials Science and Technology, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Peng ZhangAbstract:ABSTRACTThe dynamic compression properties of B4C/6061Al Neutron Absorber composites (NACs) with three B4C volume fractions (20–40%), fabricated by power metallurgy, were studied. Compression tests were conducted at strain rates ranging from 760 to 1150 s−1, using a split Hopkinson pressure bar. The damage mechanism was studied through microstructural analysis. Results show that the B4C particles exhibited a uniform distribution in the 6061Al matrix. The NACs dynamic strength was found to improve with increasing quantities of B4C particles, and with strain rate. The damage mechanisms include particle fracture and interface debonding. Dislocation pile-up was observed at grain boundaries and at the interface between particles and the matrix. A constitutive model under dynamic compression was developed based on the Johnson–Cook model.This paper is part of a thematic issue on Nuclear Materials.
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microstructure evolution and mechanical properties of b4c 6061al Neutron Absorber composite sheets fabricated by powder metallurgy
Journal of Alloys and Compounds, 2018Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Ruixiang Liu, Yan Zhang, Peng ZhangAbstract:Abstract B4C particle reinforced 6061Al matrix composites is interestingly used for Neutron shielding due to its light weight and good strength and Neutron absorbing. In this study, B4C/6061Al Neutron Absorber composite (B4C/6061Al NAC) sheet containing 30 wt% B4C particle was first fabricated by powder metallurgy (hot pressed sintering→extrusion→rolling), then its microstructure and mechanical properties were investigated. It was found that B4C particles distributed relatively homogeneously in the 6061Al matrix and the composite was mainly consisted of B4C, Al and Al2O3 phases. B4C particles were found to be able to stimulate dynamic recrystallization (DRX) nucleation; restrain the grain growth; and reduce the preferential orientation of the aluminum grains. Moreover, under increasing deformation, amount of DRX was found to increases; the ultimate tensile and yield strength of the composites first increased and then decreased; while its elongation to fracture dropped. The decrease in strength was found to be due to the fracture of large B4C particles and the stress concentration in the locations between the B4C particle and the 6061Al matrix.
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Microstructure evolution and mechanical properties of B4C/6061Al Neutron Absorber composite sheets fabricated by powder metallurgy
Journal of Alloys and Compounds, 2018Co-Authors: Chen Hongsheng, H. H. Nie, Jun Zhou, Wenxian Wang, Ruixiang Liu, Yan Zhang, Peng ZhangAbstract:Abstract B4C particle reinforced 6061Al matrix composites is interestingly used for Neutron shielding due to its light weight and good strength and Neutron absorbing. In this study, B4C/6061Al Neutron Absorber composite (B4C/6061Al NAC) sheet containing 30 wt% B4C particle was first fabricated by powder metallurgy (hot pressed sintering→extrusion→rolling), then its microstructure and mechanical properties were investigated. It was found that B4C particles distributed relatively homogeneously in the 6061Al matrix and the composite was mainly consisted of B4C, Al and Al2O3 phases. B4C particles were found to be able to stimulate dynamic recrystallization (DRX) nucleation; restrain the grain growth; and reduce the preferential orientation of the aluminum grains. Moreover, under increasing deformation, amount of DRX was found to increases; the ultimate tensile and yield strength of the composites first increased and then decreased; while its elongation to fracture dropped. The decrease in strength was found to be due to the fracture of large B4C particles and the stress concentration in the locations between the B4C particle and the 6061Al matrix.
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The dynamic properties of B4C/6061Al Neutron Absorber composites fabricated by power metallurgy
Materials Science and Technology, 2017Co-Authors: Hongsheng Chen, H. H. Nie, Jun Zhou, Wenxian Wang, Peng ZhangAbstract:ABSTRACTThe dynamic compression properties of B4C/6061Al Neutron Absorber composites (NACs) with three B4C volume fractions (20–40%), fabricated by power metallurgy, were studied. Compression tests were conducted at strain rates ranging from 760 to 1150 s−1, using a split Hopkinson pressure bar. The damage mechanism was studied through microstructural analysis. Results show that the B4C particles exhibited a uniform distribution in the 6061Al matrix. The NACs dynamic strength was found to improve with increasing quantities of B4C particles, and with strain rate. The damage mechanisms include particle fracture and interface debonding. Dislocation pile-up was observed at grain boundaries and at the interface between particles and the matrix. A constitutive model under dynamic compression was developed based on the Johnson–Cook model.This paper is part of a thematic issue on Nuclear Materials.
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hot deformation behaviors and processing maps of b4c al6061 Neutron Absorber composites
Materials Characterization, 2017Co-Authors: Wenxian Wang, Jun Zhou, Hongsheng ChenAbstract:Abstract In this study, the hot deformation behaviors of 30 wt.% B4C/Al6061 Neutron Absorber composites (NACs) have been investigated by conducting isothermal compression tests at temperatures ranging from 653 K to 803 K and strain rates from 0.01 to 10 s− 1. It was found that, during hot compression, the B4C/Al6061 NACs exhibited a steady flow characteristic which can be expressed by the Zener-Hollomon parameter as a hyperbolic-sine function of flow stress. High average activation energy (185.62 kJ/mol) of B4C/Al6061 NACs is noted in current study owing to the high content of B4C particle. The optimum hot working conditions for B4C/Al6061 NACs are found to be 760–803 K/0.01–0.05 s− 1 based on processing map and microstructure evolution. Typical material instabilities are thought to be attributed to void formation, adiabatic shear bands (ASB), particle debonding, and matrix cracking. Finally, the effect of the plastic deformation zones (PDZs) on the microstructure evolution in this 30 wt.% B4C/Al6061 composite is found to be very important.