Wang Yu-Ting, Zu Xu-Dong, Liu Xiang-Kui, Huang Zheng-Xiang, Jin Peng-Gang, Kong Jian
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
School of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Materials (Basel). 2020 Dec 21;13(24):5828. doi: 10.3390/ma13245828.
The mechanical properties of (CuZrAl)Dy bulk metallic glass (BMG) were characterized under various strain rates by quasi-static and dynamic compressive tests. In the quasi-static compressive tests, the yield stress of (CuZrAl)Dy BMG increased from 1234 MPa to 1844 MPa when the strain rate was increased from 0.001 s to 0.01 s, and the yield stress decreased to 1430 MPa at the strain rate of 0.1 s. In the dynamic compressive tests, when the strain rate increased from 1550 s to 2990 s, the yield stress of (CuZrAl)Dy BMG first decreased from 1508 MPa to 1404 MPa, and then increased to 1593 MPa. The fracture behaviors of (CuZrAl)Dy BMG were studied by using scanning electron microscopy to examine the fracture surface. Fracture occurred in the pure shear mode with strain rates below 2100 s, whereas shear fracture and normal fracture occurred simultaneously under strain rates of 2650 s and 2990 s.
通过准静态和动态压缩试验，在不同应变率下对（CuZrAl）Dy块体金属玻璃（BMG）的力学性能进行了表征。在准静态压缩试验中，当应变率从0.001 s增加到0.01 s时，（CuZrAl）Dy BMG的屈服应力从1234 MPa增加到1844 MPa，而在应变率为0.1 s时屈服应力降至1430 MPa。在动态压缩试验中，当应变率从1550 s增加到2990 s时，（CuZrAl）Dy BMG的屈服应力首先从1508 MPa降至1404 MPa，然后又增加到1593 MPa。利用扫描电子显微镜观察断裂表面，研究了（CuZrAl）Dy BMG的断裂行为。在应变率低于2100 s时，断裂以纯剪切模式发生，而在应变率为2650 s和2990 s时，剪切断裂和正断同时发生。
