Deformation mechanisms of the Zr40Ti14Ni10Cu12Be24 bulk metallic glass

被引:353
作者
Wright, WJ [1 ]
Saha, R [1 ]
Nix, WD [1 ]
机构
[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA
关键词
adiabatic heating; amorphous metal; free volume; metallic glass; Mohr-Coulomb; nanoindentation; serrated flow;
D O I
10.2320/matertrans.42.642
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have studied the mechanical behavior of Zr40Ti14Ni10Cu12Be24 through uniaxial compression and nanoindentation experiments. Quantitative measurements of the serrated plastic flow observed during uniaxial compression are reported. These data are used to predict temperature increases in single shear bands due to local adiabatic heating caused by the work done on the sample as shear propagates progressively across the sample. Since the predicted temperature increases are insufficient to reach the glass transition temperature, it is unlikely that localized hearing is the primary cause of flow localization Instead, localization of shear is more likely caused by changes in viscosity associated with increased free volume in the sheer bands. The orientation of the shear bands in compression tests and an indentation size effect for the onset of plastic Bow in nanoindentation both point to increased free volume as the cause of localization.
引用
收藏
页码:642 / 649
页数:8
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