The Experts below are selected from a list of 924 Experts worldwide ranked by ideXlab platform
Nikhilesh Chawla - One of the best experts on this subject based on the ideXlab platform.
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unveiling the deformation behavior and strengthening mechanisms of al3bc al composites via in situ Micropillar Compression
Journal of Alloys and Compounds, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Qingdong Zhang, Shery L. Y. Chang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as the reinforcement for Al alloys. However the deformation behavior and strengthening mechanisms remain unclear hitherto. In this work, the deformation behavior and strengthening mechanisms of Al3BC/Al composites were investigated via in-situ Micropillar Compression. Wrinkled slip bands and slip homogenization were observed in the composites instead of large parallel slip bands in pure Al. The interaction between Al3BC and dislocations was investigated in this work. Microstructural characterization reveals that the high density dislocations and Al3BC-induced ultrafine sub-grains determine its excellent strengthening effects on Al matrix.
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micromechanical properties and deformation behavior of al3bc 6061 al composites via Micropillar Compression
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2020Co-Authors: Arun Sundar S. Singaravelu, Yongfeng Zhao, Xiangfa Liu, Qingdong Zhang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as reinforcement of Al alloy. In this work, Al3BC reinforced 6061 Al composites were in-situ fabricated through a liquid-solid reaction method followed by hot extrusion, and the micromechanical properties as well as deformation behavior of the composites were investigated via Micropillar Compression. The Al3BC/6061 composites show a significant improvement of Compression strength than the matrix alloy, indicating an outstanding strengthening effect of Al3BC. Compared with the large parallel local slip bands on the post-compressed pillars of unreinforced matrix materials, the wrinkled slip bands were observed and homogenously distribute on the post-compressed pillars of the composites, indicating an impeding effect on the propagation of slip bands and a better slip homogenization caused by Al3BC particles. The strengthening mechanisms were also discussed and microstructural characterizations reveal that the high strength of the composites is mainly attributed to its high dislocation density, grains refinement and load transfer effects caused by Al3BC.
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Unveiling the deformation behavior and strengthening mechanisms of Al3BC/Al composites via in-situ Micropillar Compression
Journal of Alloys and Compounds, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Qingdong Zhang, Shery L. Y. Chang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as the reinforcement for Al alloys. However the deformation behavior and strengthening mechanisms remain unclear hitherto. In this work, the deformation behavior and strengthening mechanisms of Al3BC/Al composites were investigated via in-situ Micropillar Compression. Wrinkled slip bands and slip homogenization were observed in the composites instead of large parallel slip bands in pure Al. The interaction between Al3BC and dislocations was investigated in this work. Microstructural characterization reveals that the high density dislocations and Al3BC-induced ultrafine sub-grains determine its excellent strengthening effects on Al matrix.
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Mechanical properties of Al3BC by nanoindentation and Micropillar Compression
Materials Letters, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Nikhilesh ChawlaAbstract:Abstract Mechanical properties of Al3BC are still not sufficiently investigated yet for its synthesis difficulties. In this work, the mechanical properties of single-crystal Al3BC were experimentally measured through nanoindentation and Micropillar Compression for the first time. The hardness, modulus and Compression strength were measured to be 24 GPa, 332 GPa and 8.7 GPa, respectively. The high mechanical properties of Al3BC are one prerequisite for it as the reinforcement of Al alloys. This work is expected to have a profound significance for the design and optimization of Al3BC/Al composites.
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Micromechanical properties and deformation behavior of Al3BC/6061 Al composites via Micropillar Compression
Materials Science and Engineering: A, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Qingdong Zhang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as reinforcement of Al alloy. In this work, Al3BC reinforced 6061 Al composites were in-situ fabricated through a liquid-solid reaction method followed by hot extrusion, and the micromechanical properties as well as deformation behavior of the composites were investigated via Micropillar Compression. The Al3BC/6061 composites show a significant improvement of Compression strength than the matrix alloy, indicating an outstanding strengthening effect of Al3BC. Compared with the large parallel local slip bands on the post-compressed pillars of unreinforced matrix materials, the wrinkled slip bands were observed and homogenously distribute on the post-compressed pillars of the composites, indicating an impeding effect on the propagation of slip bands and a better slip homogenization caused by Al3BC particles. The strengthening mechanisms were also discussed and microstructural characterizations reveal that the high strength of the composites is mainly attributed to its high dislocation density, grains refinement and load transfer effects caused by Al3BC.
Haruyuki Inui - One of the best experts on this subject based on the ideXlab platform.
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Micropillar Compression deformation of single crystals of fe 3 ge with the l1 2 structure
2021Co-Authors: Zhenghao Chen, Haruyuki InuiAbstract:The plastic deformation behavior of single crystals of Fe3Ge with the L12 structure has been investigated at room temperature as a function of crystal orientation by Micropillar Compression tests. In addition to slip on (010), slip on (111) is observed to occur in Fe3Ge for the first time. The CRSS (critical resolved shear stress) for (111)[10‾1] slip, estimated by extrapolating the size-dependent strength variation to the ‘bulk’ size, is ~240 MPa, which is almost 6 times that (~40 MPa) for (010)[101] slip similarly estimated. The dissociation scheme for the superlattice dislocation with b=[10‾1] is confirmed to be of the APB (anti-phase boundary)-type both on (010) and on (111), in contrast to the previous prediction for the SISF (superlattice intrinsic stacking fault) scheme on (111) because of the expected APB instability. While superlattice dislocations do not have any preferential directions to align when gliding on (010) (indicative of low frictional stress at room temperature), the alignment of superlattice dislocations along their screw orientation is observed when gliding on (111). This is proved to be due to thermally-activated cross-slip to form Kear-Wilsdorf locks, indicative of the occurrence of yield stress anomaly that is observed in many other L12 compounds such as Ni3Al. Some important deformation characteristics expected to occur in Fe3Ge (such as the absence of SISF-couple dissociation and the occurrence of yield stress anomaly) will be discussed in the light of the experimental results obtained (APB energies on (111) and (010) and CRSS values for slip on (111) and (010)).
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Micropillar Compression deformation of single crystals of α-Nb5Si3 with the tetragonal D8 l structure.
Science and technology of advanced materials, 2021Co-Authors: Kyosuke Kishida, Takuto Maruyama, Takayoshi Fukuyama, Haruyuki InuiAbstract:The plastic deformation behavior of single crystals of α-Nb5Si3 with the tetragonal D8 l structure has been investigated by Micropillar Compression at room temperature as a function of crystal orie...
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Micropillar Compression deformation of single crystals of Fe3Ge with the L12 structure
Acta Materialia, 2021Co-Authors: Zhenghao Chen, Haruyuki InuiAbstract:Abstract The plastic deformation behavior of single crystals of Fe3Ge with the L12 structure has been investigated at room temperature as a function of crystal orientation by Micropillar Compression tests. In addition to slip on (010), slip on (111) is observed to occur in Fe3Ge for the first time. The CRSS (critical resolved shear stress) for (111)[10 1 ¯ ] slip, estimated by extrapolating the size-dependent strength variation to the ‘bulk’ size, is ∼240 MPa, which is almost 6 times that (∼40 MPa) for (010)[10 1 ¯ ] slip similarly estimated. The dissociation scheme for the superlattice dislocation with b=[10 1 ¯ ] is confirmed to be of the APB (anti-phase boundary)-type both on (010) and on (111), in contrast to the previous prediction for the SISF (superlattice intrinsic stacking fault) scheme on (111) because of the expected APB instability. While superlattice dislocations do not have any preferential directions to align when gliding on (010) (indicative of low frictional stress at room temperature), the alignment of superlattice dislocations along their screw orientation is observed when gliding on (111). This is proved to be due to thermally-activated cross-slip to form Kear-Wilsdorf locks, indicative of the occurrence of yield stress anomaly that is observed in many other L12 compounds such as Ni3Al. Some important deformation characteristics expected to occur in Fe3Ge (such as the absence of SISF-couple dissociation and the occurrence of yield stress anomaly) will be discussed in the light of the experimental results obtained (APB energies on (111) and (010) and CRSS values for slip on (111) and (010)).
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Plastic deformation of single crystals of the δ1p and δ1k intermetallic compounds in the Fe–Zn system by Micropillar Compression
International Journal of Plasticity, 2021Co-Authors: Yukichika Hashizume, Masahiro Inomoto, Norihiko L Okamoto, Haruyuki InuiAbstract:Abstract The plastic deformation behavior of single crystals of the δ1p and δ1k phase compounds in the Fe–Zn system, which are the major constituent phases in the coating layer of galvannealed (GA) steels, has been investigated by Micropillar Compression tests at room temperature as a function of crystal orientation and specimen size. (0001)[11 2 ‾ 0] basal slip and (10 1 ‾ 0)[ 1 ‾ 2 1 ‾ 0] prism slip are observed to operate in the δ1p phase compound while (0001)[11 2 ‾ 0] basal slip is observed in the δ1k phase compound. For all cases, a significant strain burst occurs immediately after yielding, forming giant steps on the slip planes along the slip direction and leading in many cases to instantaneous ‘slip plane (shear) failure’. The extent of such strain burst as well as instantaneous ‘slip plane failure’ is reduced by introducing dislocations (pre-straining) prior to Micropillar testing, accompanied by the reduction in the stress at which such strain burst occurs as well as that in the extent of strain burst. The critical resolved shear stress (CRSS) for basal and prism slip in the δ1p and δ1k phase compounds all show an inverse power-law scaling against the specimen size with an exponent in the range of 0.02–0.06. The bulk CRSS values are estimated respectively to be approximately 320, 430, and 765 MPa for the basal slip in the δ1p and δ1k compounds and the prism slip in the δ1p compound by taking into account the specimen size effects of CRSS.
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Room temperature deformation of single crystals of Ti 5 Si 3 with the hexagonal D8 8 structure investigated by Micropillar Compression tests
Scientific reports, 2020Co-Authors: Kyosuke Kishida, Takuto Maruyama, Takayoshi Fukuyama, Haruyuki InuiAbstract:Micropillar Compression tests of Ti5Si3 single crystals were conducted at room temperature as a function of loading axis orientation and specimen size in order to investigate their room temperature plastic deformation behavior. Plastic flow by the operation of three deformation modes, {1 $${\overline{1}}$$ 00}[0001], {2 $${\overline{1}}$$ $${\overline{1}}$$ 2} and {1 $${\overline{1}}$$ 01} slip were observed in [2 $${\overline{2}}$$ 05]-, [0001]- and [4 $${\overline{3}}$$ $${\overline{1}}$$ 0]-oriented Micropillar specimens deformed at room temperature, respectively. The CRSS values were evaluated to be very high above 2.7 GPa and were confirmed to increase up to about 6 GPa with the decrease in the specimen size. The fracture toughness values are evaluated to be 0.45 MPa m1/2 (notch plane // (0001)) and 0.73 MPa m1/2 (notch plane //(1 $${\overline{1}}$$ 00)) based on the results of micro-cantilever bend tests of chevron-notched specimens. The fracture toughness values are considerably lower than those for D8l-Mo5SiB2 and D8l-Nb5Si3 evaluated by the same method, indicating the inherent brittleness of binary Ti5Si3 compared to the other transition-metal silicides of the TM5Si3 type (TM: transition-metal).
Kyosuke Kishida - One of the best experts on this subject based on the ideXlab platform.
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Micropillar Compression deformation of single crystals of α-Nb5Si3 with the tetragonal D8 l structure.
Science and technology of advanced materials, 2021Co-Authors: Kyosuke Kishida, Takuto Maruyama, Takayoshi Fukuyama, Haruyuki InuiAbstract:The plastic deformation behavior of single crystals of α-Nb5Si3 with the tetragonal D8 l structure has been investigated by Micropillar Compression at room temperature as a function of crystal orie...
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Room temperature deformation of single crystals of Ti 5 Si 3 with the hexagonal D8 8 structure investigated by Micropillar Compression tests
Scientific reports, 2020Co-Authors: Kyosuke Kishida, Takuto Maruyama, Takayoshi Fukuyama, Haruyuki InuiAbstract:Micropillar Compression tests of Ti5Si3 single crystals were conducted at room temperature as a function of loading axis orientation and specimen size in order to investigate their room temperature plastic deformation behavior. Plastic flow by the operation of three deformation modes, {1 $${\overline{1}}$$ 00}[0001], {2 $${\overline{1}}$$ $${\overline{1}}$$ 2} and {1 $${\overline{1}}$$ 01} slip were observed in [2 $${\overline{2}}$$ 05]-, [0001]- and [4 $${\overline{3}}$$ $${\overline{1}}$$ 0]-oriented Micropillar specimens deformed at room temperature, respectively. The CRSS values were evaluated to be very high above 2.7 GPa and were confirmed to increase up to about 6 GPa with the decrease in the specimen size. The fracture toughness values are evaluated to be 0.45 MPa m1/2 (notch plane // (0001)) and 0.73 MPa m1/2 (notch plane //(1 $${\overline{1}}$$ 00)) based on the results of micro-cantilever bend tests of chevron-notched specimens. The fracture toughness values are considerably lower than those for D8l-Mo5SiB2 and D8l-Nb5Si3 evaluated by the same method, indicating the inherent brittleness of binary Ti5Si3 compared to the other transition-metal silicides of the TM5Si3 type (TM: transition-metal).
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room temperature deformation of single crystals of ti 5 si 3 with the hexagonal d8 8 structure investigated by Micropillar Compression tests
Scientific Reports, 2020Co-Authors: Kyosuke Kishida, Takuto Maruyama, Takayoshi Fukuyama, Haruyuki InuiAbstract:Micropillar Compression tests of Ti5Si3 single crystals were conducted at room temperature as a function of loading axis orientation and specimen size in order to investigate their room temperature plastic deformation behavior. Plastic flow by the operation of three deformation modes, {1 $${\overline{1}}$$ 00}[0001], {2 $${\overline{1}}$$ $${\overline{1}}$$ 2} < 2 $${\overline{1}}$$ $${\overline{1}}$$ $${\overline{3}}$$ > and {1 $${\overline{1}}$$ 01} < 2 $${\overline{1}}$$ $${\overline{1}}$$ $${\overline{3}}$$ > slip were observed in [2 $${\overline{2}}$$ 05]-, [0001]- and [4 $${\overline{3}}$$ $${\overline{1}}$$ 0]-oriented Micropillar specimens deformed at room temperature, respectively. The CRSS values were evaluated to be very high above 2.7 GPa and were confirmed to increase up to about 6 GPa with the decrease in the specimen size. The fracture toughness values are evaluated to be 0.45 MPa m1/2 (notch plane // (0001)) and 0.73 MPa m1/2 (notch plane //(1 $${\overline{1}}$$ 00)) based on the results of micro-cantilever bend tests of chevron-notched specimens. The fracture toughness values are considerably lower than those for D8l-Mo5SiB2 and D8l-Nb5Si3 evaluated by the same method, indicating the inherent brittleness of binary Ti5Si3 compared to the other transition-metal silicides of the TM5Si3 type (TM: transition-metal).
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experimental evaluation of critical resolved shear stress for the first order pyramidal c a slip in commercially pure ti by Micropillar Compression method
Acta Materialia, 2020Co-Authors: Kyosuke Kishida, Jim Geum Kim, Tadashige Nagae, Haruyuki InuiAbstract:Abstract The plastic deformation behavior of commercially pure Ti single crystals has been investigated by uniaxial Micropillar Compression tests as a function of crystal orientation and specimen size at room temperature. {10 1 ¯ 1} (first-order) pyramidal c+a slip and prism a slip are activated in Micropillar specimens with the [0001] and [2 1 ¯ 1 ¯ 0] orientations, respectively. {10 1 ¯ 1} pyramidal c+a slip has never been observed to operate as a major deformation mode in Compression tests of ‘bulk’ single crystals at room temperature, in which {11 2 ¯ 2} 2 ¯ 3 ¯ > twinning is usually observed. The CRSS values for {10 1 ¯ 1} pyramidal c+a slip and prism a slip increase with the decrease in the specimen size, following an inverse power-law relationship with a power-law exponent of about 0.06 and 0.59, respectively. The extrapolation of the inverse power-law relationship up to the ‘bulk’ specimen size estimated from the CRSS values of prism a slip gives the ‘bulk’ CRSS value for {10 1 ¯ 1} pyramidal c+a slip to be 580-635 MPa, which is by far higher than those for any other deformation modes operative at room temperature.
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Experimental evaluation of critical resolved shear stress for the first-order pyramidal c + a slip in commercially pure Ti by Micropillar Compression method
Acta Materialia, 2020Co-Authors: Kyosuke Kishida, Jim Geum Kim, Tadashige Nagae, Haruyuki InuiAbstract:Abstract The plastic deformation behavior of commercially pure Ti single crystals has been investigated by uniaxial Micropillar Compression tests as a function of crystal orientation and specimen size at room temperature. {10 1 ¯ 1} (first-order) pyramidal c+a slip and prism a slip are activated in Micropillar specimens with the [0001] and [2 1 ¯ 1 ¯ 0] orientations, respectively. {10 1 ¯ 1} pyramidal c+a slip has never been observed to operate as a major deformation mode in Compression tests of ‘bulk’ single crystals at room temperature, in which {11 2 ¯ 2} 2 ¯ 3 ¯ > twinning is usually observed. The CRSS values for {10 1 ¯ 1} pyramidal c+a slip and prism a slip increase with the decrease in the specimen size, following an inverse power-law relationship with a power-law exponent of about 0.06 and 0.59, respectively. The extrapolation of the inverse power-law relationship up to the ‘bulk’ specimen size estimated from the CRSS values of prism a slip gives the ‘bulk’ CRSS value for {10 1 ¯ 1} pyramidal c+a slip to be 580-635 MPa, which is by far higher than those for any other deformation modes operative at room temperature.
Qingdong Zhang - One of the best experts on this subject based on the ideXlab platform.
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unveiling the deformation behavior and strengthening mechanisms of al3bc al composites via in situ Micropillar Compression
Journal of Alloys and Compounds, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Qingdong Zhang, Shery L. Y. Chang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as the reinforcement for Al alloys. However the deformation behavior and strengthening mechanisms remain unclear hitherto. In this work, the deformation behavior and strengthening mechanisms of Al3BC/Al composites were investigated via in-situ Micropillar Compression. Wrinkled slip bands and slip homogenization were observed in the composites instead of large parallel slip bands in pure Al. The interaction between Al3BC and dislocations was investigated in this work. Microstructural characterization reveals that the high density dislocations and Al3BC-induced ultrafine sub-grains determine its excellent strengthening effects on Al matrix.
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micromechanical properties and deformation behavior of al3bc 6061 al composites via Micropillar Compression
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2020Co-Authors: Arun Sundar S. Singaravelu, Yongfeng Zhao, Xiangfa Liu, Qingdong Zhang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as reinforcement of Al alloy. In this work, Al3BC reinforced 6061 Al composites were in-situ fabricated through a liquid-solid reaction method followed by hot extrusion, and the micromechanical properties as well as deformation behavior of the composites were investigated via Micropillar Compression. The Al3BC/6061 composites show a significant improvement of Compression strength than the matrix alloy, indicating an outstanding strengthening effect of Al3BC. Compared with the large parallel local slip bands on the post-compressed pillars of unreinforced matrix materials, the wrinkled slip bands were observed and homogenously distribute on the post-compressed pillars of the composites, indicating an impeding effect on the propagation of slip bands and a better slip homogenization caused by Al3BC particles. The strengthening mechanisms were also discussed and microstructural characterizations reveal that the high strength of the composites is mainly attributed to its high dislocation density, grains refinement and load transfer effects caused by Al3BC.
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Unveiling the deformation behavior and strengthening mechanisms of Al3BC/Al composites via in-situ Micropillar Compression
Journal of Alloys and Compounds, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Qingdong Zhang, Shery L. Y. Chang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as the reinforcement for Al alloys. However the deformation behavior and strengthening mechanisms remain unclear hitherto. In this work, the deformation behavior and strengthening mechanisms of Al3BC/Al composites were investigated via in-situ Micropillar Compression. Wrinkled slip bands and slip homogenization were observed in the composites instead of large parallel slip bands in pure Al. The interaction between Al3BC and dislocations was investigated in this work. Microstructural characterization reveals that the high density dislocations and Al3BC-induced ultrafine sub-grains determine its excellent strengthening effects on Al matrix.
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Micromechanical properties and deformation behavior of Al3BC/6061 Al composites via Micropillar Compression
Materials Science and Engineering: A, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Qingdong Zhang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as reinforcement of Al alloy. In this work, Al3BC reinforced 6061 Al composites were in-situ fabricated through a liquid-solid reaction method followed by hot extrusion, and the micromechanical properties as well as deformation behavior of the composites were investigated via Micropillar Compression. The Al3BC/6061 composites show a significant improvement of Compression strength than the matrix alloy, indicating an outstanding strengthening effect of Al3BC. Compared with the large parallel local slip bands on the post-compressed pillars of unreinforced matrix materials, the wrinkled slip bands were observed and homogenously distribute on the post-compressed pillars of the composites, indicating an impeding effect on the propagation of slip bands and a better slip homogenization caused by Al3BC particles. The strengthening mechanisms were also discussed and microstructural characterizations reveal that the high strength of the composites is mainly attributed to its high dislocation density, grains refinement and load transfer effects caused by Al3BC.
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Three-Dimensional (3D) Microstructure-Based Modeling of a Thermally-Aged Cast Duplex Stainless Steel Based on X-ray Microtomography, Nanoindentation and Micropillar Compression
Metals, 2019Co-Authors: Qingdong Zhang, Arun Sundar S. Singaravelu, Tao Jing, Kai Zhu, Weizhao Sun, Nikhilesh ChawlaAbstract:Finite element analysis was conducted on a thermally-aged cast duplex stainless steel based on the true three-dimensional (3D) microstructure obtained from X-ray microtomography experiments and using the constitutive behavior of each individual phase extracted from nanoindentation on single-crystal and bicrystal Micropillar Compression tests. The evolution of the phase morphology, the mechanical properties and the boundary deformation behavior during the aging process are highlighted. Quantitative analysis in terms of the distribution and evolution of the stress and strain in both the as received and aged conditions was performed. The experimental results show that aging at an intermediate temperature has a negligible influence on the morphology of the two phases in cast duplex stainless steel (CDSS). Results from simulations reveal that the mechanical behavior of this material were seriously affected by the microstructure and the mechanical properties of the individual phase and the necking deformation tend to form in the area with less large ferrite grains after aging. In addition, stress localization tends to form at the austenite/ferrite interface, in the narrow region of ferrite grains and in the small ferrite grains.
Arun Sundar S. Singaravelu - One of the best experts on this subject based on the ideXlab platform.
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unveiling the deformation behavior and strengthening mechanisms of al3bc al composites via in situ Micropillar Compression
Journal of Alloys and Compounds, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Qingdong Zhang, Shery L. Y. Chang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as the reinforcement for Al alloys. However the deformation behavior and strengthening mechanisms remain unclear hitherto. In this work, the deformation behavior and strengthening mechanisms of Al3BC/Al composites were investigated via in-situ Micropillar Compression. Wrinkled slip bands and slip homogenization were observed in the composites instead of large parallel slip bands in pure Al. The interaction between Al3BC and dislocations was investigated in this work. Microstructural characterization reveals that the high density dislocations and Al3BC-induced ultrafine sub-grains determine its excellent strengthening effects on Al matrix.
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micromechanical properties and deformation behavior of al3bc 6061 al composites via Micropillar Compression
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2020Co-Authors: Arun Sundar S. Singaravelu, Yongfeng Zhao, Xiangfa Liu, Qingdong Zhang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as reinforcement of Al alloy. In this work, Al3BC reinforced 6061 Al composites were in-situ fabricated through a liquid-solid reaction method followed by hot extrusion, and the micromechanical properties as well as deformation behavior of the composites were investigated via Micropillar Compression. The Al3BC/6061 composites show a significant improvement of Compression strength than the matrix alloy, indicating an outstanding strengthening effect of Al3BC. Compared with the large parallel local slip bands on the post-compressed pillars of unreinforced matrix materials, the wrinkled slip bands were observed and homogenously distribute on the post-compressed pillars of the composites, indicating an impeding effect on the propagation of slip bands and a better slip homogenization caused by Al3BC particles. The strengthening mechanisms were also discussed and microstructural characterizations reveal that the high strength of the composites is mainly attributed to its high dislocation density, grains refinement and load transfer effects caused by Al3BC.
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Mechanical properties of Al3BC by nanoindentation and Micropillar Compression
Materials Letters, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Nikhilesh ChawlaAbstract:Abstract Mechanical properties of Al3BC are still not sufficiently investigated yet for its synthesis difficulties. In this work, the mechanical properties of single-crystal Al3BC were experimentally measured through nanoindentation and Micropillar Compression for the first time. The hardness, modulus and Compression strength were measured to be 24 GPa, 332 GPa and 8.7 GPa, respectively. The high mechanical properties of Al3BC are one prerequisite for it as the reinforcement of Al alloys. This work is expected to have a profound significance for the design and optimization of Al3BC/Al composites.
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Unveiling the deformation behavior and strengthening mechanisms of Al3BC/Al composites via in-situ Micropillar Compression
Journal of Alloys and Compounds, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Qingdong Zhang, Shery L. Y. Chang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as the reinforcement for Al alloys. However the deformation behavior and strengthening mechanisms remain unclear hitherto. In this work, the deformation behavior and strengthening mechanisms of Al3BC/Al composites were investigated via in-situ Micropillar Compression. Wrinkled slip bands and slip homogenization were observed in the composites instead of large parallel slip bands in pure Al. The interaction between Al3BC and dislocations was investigated in this work. Microstructural characterization reveals that the high density dislocations and Al3BC-induced ultrafine sub-grains determine its excellent strengthening effects on Al matrix.
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Micromechanical properties and deformation behavior of Al3BC/6061 Al composites via Micropillar Compression
Materials Science and Engineering: A, 2020Co-Authors: Yongfeng Zhao, Arun Sundar S. Singaravelu, Xiangfa Liu, Qingdong Zhang, Nikhilesh ChawlaAbstract:Abstract Al3BC has been proved to be a promising candidate as reinforcement of Al alloy. In this work, Al3BC reinforced 6061 Al composites were in-situ fabricated through a liquid-solid reaction method followed by hot extrusion, and the micromechanical properties as well as deformation behavior of the composites were investigated via Micropillar Compression. The Al3BC/6061 composites show a significant improvement of Compression strength than the matrix alloy, indicating an outstanding strengthening effect of Al3BC. Compared with the large parallel local slip bands on the post-compressed pillars of unreinforced matrix materials, the wrinkled slip bands were observed and homogenously distribute on the post-compressed pillars of the composites, indicating an impeding effect on the propagation of slip bands and a better slip homogenization caused by Al3BC particles. The strengthening mechanisms were also discussed and microstructural characterizations reveal that the high strength of the composites is mainly attributed to its high dislocation density, grains refinement and load transfer effects caused by Al3BC.