Rate dependent of strength in metallic glasses at different temperatures.
Rate dependent of strength in metallic glasses at different temperatures.
复制标题
DOI：
10.1038/srep27747
复制
发表时间：
2016-06-08
影响因子：
4.6
通讯作者：
Wang G
中科院分区：
文献类型：
--
作者：
Wang YW;Bian XL;Wu SW;Hussain I;Jia YD;Yi J;Wang G
研究了块体金属玻璃宏观强度与微观弹性变形和剪切开裂行为之间的相关性。在298 K和77 K的温度以及10 - 6 s-1 ~ 10 - 2 s-1的应变速率下，对BMG进行了压缩试验，得到了BMG的力学响应曲线。屈服强度与基本变形单元的激活有关，基本变形单元对应变速率不敏感。最大抗压强度与剪切断裂过程中的裂纹扩展有关，并受应变率的影响。77 K的低温显著提高了BMG的屈服强度和最大抗压强度。
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.