The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
William L. Johnson - One of the best experts on this subject based on the ideXlab platform.
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Effect of oxygen concentration upon the ductility of amorphous Zr57Nb5Al10Cu15.4Ni12.6
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: R.d. Conner, R.e. Maire, William L. JohnsonAbstract:The effect of oxygen content on the mechanical and thermal properties of Zr57Nb5Al10Cu15.4Ni12.6 bulk metallic glass was measured. Oxygen was systematically added to a master alloy through the addition of ZrO2. Compression, Vickers hardness and bending, differential scanning calorimetry (DSC) and X-ray measurements were performed. Material with no additional oxygen demonstrated the ability to deform through Multiple Shear Band formation, while that with higher oxygen content retained up to 90% of its compressive strength but lost virtually all ductility. The loss of ductility is attributed to the formation of Zr2Cu- and Zr2Ni-type intermetallic oxide particles.
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Shear Band spacing under bending of zr based metallic glass plates
Acta Materialia, 2004Co-Authors: R.d. Conner, W D Nix, William L. JohnsonAbstract:Metallic glasses often exhibit marked ductility when subjected to compressive or bending loads as a result of Multiple Shear Band formation. This observed ductility depends upon sample geometry; thin plates show ductility in bending while thicker plates of the same composition fracture under similar loading. The thickness dependence of yielding and fracture of metallic glass plates subjected to bending is considered in terms of the Shear Band processes responsible for these properties. Experimental results show that Shear Band spacing and length scale with the thickness of the plate at a ratio of 1:10. Both Shear Band offset and Shear Band spacing increase with increasing curvature; Shear Band offset as the square of the plate thickness. As bending is increased beyond yield, Shear Band spacing continues to increase until the strain is accommodated by a few long Shear Bands. Continued bending leads to crack formation and failure.
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Shear Band spacing under bending of zr based metallic glass plates
Acta Materialia, 2004Co-Authors: R.d. Conner, Yat Li, William L. JohnsonAbstract:Metallic glasses often exhibit marked ductility when subjected to compressive or bending loads as a result of Multiple Shear Band formation. This observed ductility depends upon sample geometry; thin plates show ductility in bending while thicker plates of the same composition fracture under similar loading. The thickness dependence of yielding and fracture of metallic glass plates subjected to bending is considered in terms of the Shear Band processes responsible for these properties. Experimental results show that Shear Band spacing and length scale with the thickness of the plate at a ratio of 1:10. Both Shear Band offset and Shear Band spacing increase with increasing curvature; Shear Band offset as the square of the plate thickness. As bending is increased beyond yield, Shear Band spacing continues to increase until the strain is accommodated by a few long Shear Bands. Continued bending leads to crack formation and failure.
R.d. Conner - One of the best experts on this subject based on the ideXlab platform.
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Effect of oxygen concentration upon the ductility of amorphous Zr57Nb5Al10Cu15.4Ni12.6
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: R.d. Conner, R.e. Maire, William L. JohnsonAbstract:The effect of oxygen content on the mechanical and thermal properties of Zr57Nb5Al10Cu15.4Ni12.6 bulk metallic glass was measured. Oxygen was systematically added to a master alloy through the addition of ZrO2. Compression, Vickers hardness and bending, differential scanning calorimetry (DSC) and X-ray measurements were performed. Material with no additional oxygen demonstrated the ability to deform through Multiple Shear Band formation, while that with higher oxygen content retained up to 90% of its compressive strength but lost virtually all ductility. The loss of ductility is attributed to the formation of Zr2Cu- and Zr2Ni-type intermetallic oxide particles.
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Shear Band spacing under bending of zr based metallic glass plates
Acta Materialia, 2004Co-Authors: R.d. Conner, W D Nix, William L. JohnsonAbstract:Metallic glasses often exhibit marked ductility when subjected to compressive or bending loads as a result of Multiple Shear Band formation. This observed ductility depends upon sample geometry; thin plates show ductility in bending while thicker plates of the same composition fracture under similar loading. The thickness dependence of yielding and fracture of metallic glass plates subjected to bending is considered in terms of the Shear Band processes responsible for these properties. Experimental results show that Shear Band spacing and length scale with the thickness of the plate at a ratio of 1:10. Both Shear Band offset and Shear Band spacing increase with increasing curvature; Shear Band offset as the square of the plate thickness. As bending is increased beyond yield, Shear Band spacing continues to increase until the strain is accommodated by a few long Shear Bands. Continued bending leads to crack formation and failure.
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Shear Band spacing under bending of zr based metallic glass plates
Acta Materialia, 2004Co-Authors: R.d. Conner, Yat Li, William L. JohnsonAbstract:Metallic glasses often exhibit marked ductility when subjected to compressive or bending loads as a result of Multiple Shear Band formation. This observed ductility depends upon sample geometry; thin plates show ductility in bending while thicker plates of the same composition fracture under similar loading. The thickness dependence of yielding and fracture of metallic glass plates subjected to bending is considered in terms of the Shear Band processes responsible for these properties. Experimental results show that Shear Band spacing and length scale with the thickness of the plate at a ratio of 1:10. Both Shear Band offset and Shear Band spacing increase with increasing curvature; Shear Band offset as the square of the plate thickness. As bending is increased beyond yield, Shear Band spacing continues to increase until the strain is accommodated by a few long Shear Bands. Continued bending leads to crack formation and failure.
H. K. Lim - One of the best experts on this subject based on the ideXlab platform.
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Fabrication and mechanical properties of WC particulate reinforced Cu_47Ti_33Zr_11Ni_6Sn_2Si_1 bulk metallic glass matrix composites
Journal of Materials Science, 2005Co-Authors: H. K. Lim, E. S. Park, J. S. Park, W. T. Kim, D. H. KimAbstract:The mechanical behavior of the WC particulate (WC_p) reinforced Cu_47Ti_33Zr_11Ni_6Sn_2Si_1 bulk metallic glass (BMG) matrix composites has been examined. The mechanical properties are improved with increasing WC_p content up to 20 wt%. The ultimate compression strength and plastic strain of the composite containing 20 wt% WC_p are 2.4 GPa and 2.4%, while those of the monolithic BMG are 1.6 GPa and ∼0%, respectively. The Multiple Shear Band formation and crack deflections through WC particles have been identified as the main mechanism for the improved toughness.
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Fabrication and mechanical properties of WC particulate reinforced Cu47Ti33Zr11Ni6Sn2Si1 bulk metallic glass matrix composites
Journal of Materials Science, 2005Co-Authors: H. K. Lim, E. S. Park, J. S. Park, Wonjin Kim, Dooreh KimAbstract:The mechanical behavior of the WC particulate (WCp) reinforced Cu47Ti33Zr11Ni6Sn2Si1 bulk metallic glass (BMG) matrix composites has been examined. The mechanical properties are improved with increasing WCp content up to 20 wt%. The ultimate compression strength and plastic strain of the composite containing 20 wt% WCp are 2.4 GPa and 2.4%, while those of the monolithic BMG are 1.6 GPa and ∼0%, respectively. The Multiple Shear Band formation and crack deflections through WC particles have been identified as the main mechanism for the improved toughness.
J. S. Park - One of the best experts on this subject based on the ideXlab platform.
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Fabrication and mechanical properties of WC particulate reinforced Cu_47Ti_33Zr_11Ni_6Sn_2Si_1 bulk metallic glass matrix composites
Journal of Materials Science, 2005Co-Authors: H. K. Lim, E. S. Park, J. S. Park, W. T. Kim, D. H. KimAbstract:The mechanical behavior of the WC particulate (WC_p) reinforced Cu_47Ti_33Zr_11Ni_6Sn_2Si_1 bulk metallic glass (BMG) matrix composites has been examined. The mechanical properties are improved with increasing WC_p content up to 20 wt%. The ultimate compression strength and plastic strain of the composite containing 20 wt% WC_p are 2.4 GPa and 2.4%, while those of the monolithic BMG are 1.6 GPa and ∼0%, respectively. The Multiple Shear Band formation and crack deflections through WC particles have been identified as the main mechanism for the improved toughness.
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Fabrication and mechanical properties of WC particulate reinforced Cu47Ti33Zr11Ni6Sn2Si1 bulk metallic glass matrix composites
Journal of Materials Science, 2005Co-Authors: H. K. Lim, E. S. Park, J. S. Park, Wonjin Kim, Dooreh KimAbstract:The mechanical behavior of the WC particulate (WCp) reinforced Cu47Ti33Zr11Ni6Sn2Si1 bulk metallic glass (BMG) matrix composites has been examined. The mechanical properties are improved with increasing WCp content up to 20 wt%. The ultimate compression strength and plastic strain of the composite containing 20 wt% WCp are 2.4 GPa and 2.4%, while those of the monolithic BMG are 1.6 GPa and ∼0%, respectively. The Multiple Shear Band formation and crack deflections through WC particles have been identified as the main mechanism for the improved toughness.
E. S. Park - One of the best experts on this subject based on the ideXlab platform.
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Fabrication and mechanical properties of WC particulate reinforced Cu_47Ti_33Zr_11Ni_6Sn_2Si_1 bulk metallic glass matrix composites
Journal of Materials Science, 2005Co-Authors: H. K. Lim, E. S. Park, J. S. Park, W. T. Kim, D. H. KimAbstract:The mechanical behavior of the WC particulate (WC_p) reinforced Cu_47Ti_33Zr_11Ni_6Sn_2Si_1 bulk metallic glass (BMG) matrix composites has been examined. The mechanical properties are improved with increasing WC_p content up to 20 wt%. The ultimate compression strength and plastic strain of the composite containing 20 wt% WC_p are 2.4 GPa and 2.4%, while those of the monolithic BMG are 1.6 GPa and ∼0%, respectively. The Multiple Shear Band formation and crack deflections through WC particles have been identified as the main mechanism for the improved toughness.
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Fabrication and mechanical properties of WC particulate reinforced Cu47Ti33Zr11Ni6Sn2Si1 bulk metallic glass matrix composites
Journal of Materials Science, 2005Co-Authors: H. K. Lim, E. S. Park, J. S. Park, Wonjin Kim, Dooreh KimAbstract:The mechanical behavior of the WC particulate (WCp) reinforced Cu47Ti33Zr11Ni6Sn2Si1 bulk metallic glass (BMG) matrix composites has been examined. The mechanical properties are improved with increasing WCp content up to 20 wt%. The ultimate compression strength and plastic strain of the composite containing 20 wt% WCp are 2.4 GPa and 2.4%, while those of the monolithic BMG are 1.6 GPa and ∼0%, respectively. The Multiple Shear Band formation and crack deflections through WC particles have been identified as the main mechanism for the improved toughness.
