The correlation between the strength at the macroscale and the elastic deformation as well as shear cracking behavior at the microscale of bulk metallic glasses (BMGs) is investigated. The temperatures of 298 K and 77 K as well as the strain rate ranging from 10−6 s−1 to 10−2 s−1 are applied to the BMGs, in which the mechanical responses of the BMGs are profiled through the compression tests. The yield strength is associated with the activation of the elementary deformation unit, which is insensitive to the strain rate. The maximum compressive strength is linked to the crack propagation during shear fracture process, which is influenced by the strain rate. The cryogenic temperature of 77 K significantly improves the yield strength and the maximum compressive strength of the BMGs.
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机译：研究了大块金属玻璃（BMGs）宏观强度与弹性变形以及微观尺度上的剪切开裂行为之间的相关性。 298 K和77 K的温度以及10 -6 s -1 到10 -2 s -1 应用于BMG，其中BMG的机械响应通过压缩测试进行了剖析。屈服强度与基本变形单元的激活相关，而基本变形单元对应变率不敏感。最大抗压强度与剪切断裂过程中的裂纹扩展有关，这受应变速率的影响。 77 K的低温可显着提高BMG的屈服强度和最大抗压强度。
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