Effect of temperature on shear bands and bending plasticity of metallic glasses
Effect of temperature on shear bands and bending plasticity of metallic glasses
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DOI：
10.1016/j.jallcom.2017.10.276
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发表时间：
2018-01
影响因子：
6.2
通讯作者：
C. Meduri;Molla Hasan;S. Adam;G. Kumar
中科院分区：
文献类型：
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作者：
C. Meduri;Molla Hasan;S. Adam;G. Kumar
研究了温度对pt57.5 cu14.7 ni5.3 p22.5和zr35ti30cu8.25 be26.75金属玻璃弯曲塑性的影响。弯曲测试范围从液氮到玻璃化转变温度，使用定制的设置进行。两种金属玻璃成形材料的弯曲应变、剪切带密度和断口临界剪切偏移量均随温度升高而减小。恒应变实验（无断裂）表明，低温下产生的剪切带更多，且剪切带长度更短，以适应相同的施加应变。根据成核和扩展模型预测的温度依赖性，可以对结果进行合理化。
We report the effect of testing temperature on the bending plasticity of Pt57.5Cu14.7Ni5.3P22.5and Zr35Ti30Cu8.25Be26.75metallic glasses. Bend tests ranging from liquid nitrogen to the glass transition temperature were conducted using a customized setup. The bending strain, the shear band density, and the critical shear offset at fracture decreased with increasing temperature in both the metallic glass formers. The constant strain experiments (without fracture) revealed that low temperature generates more shear bands of smaller lengths to accommodate the same applied strain. The results can be rationalized in terms of temperature dependence predicted by the nucleation and propagation models.