School of Mechanical Engineering, Shanghai Dianji University, 201306, Shanghai, China.
Materials Program, Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY 40506, USA.
J Nanosci Nanotechnol. 2020 Mar 1;20(3):1530-1539. doi: 10.1166/jnn.2020.16954.
In this work, we study the indentation deformation of a CuZrHfA bulk-metallic glass-matrix composite and characterize the effects of the indentation-loading rate and the holding time at the peak-indentation load. For the same peak-indentation load, increasing the holding time and/or decreasing the indentation-loading rate cause the increase of the indentation depth. There exists the "bulge" of the unloading curve at the onset of the unloading for small indentation-loading rates. The Vickers hardness is a monotonically increasing function of the indentation-loading rate for the same peak-indentation load. For the indentations with the same loading and unloading time of 30 s and without an intermediate stage at the peak-indentation load, the Vickers hardness of the CuZrHfA bulk-metallic glass-matrix composite decreases with the increase of the indentation load. The strain energy dissipated through plastic deformation during the indentation is a power-law function of the indentation load with a power index of 3/2, and the energy ratio (total energy/plastic energy) linearly increases with the depth ratio (residual indentation depth/maximum indentation depth).
在这项工作中，我们研究了 CuZrHfA 块体金属玻璃基复合材料的压痕变形，并表征了压痕加载速率和在压痕峰值负载下保持时间的影响。对于相同的压痕峰值负载，增加保持时间和/或降低压痕加载速率会导致压痕深度增加。在小压痕加载速率下，卸载曲线的起始处存在“凸起”。对于相同的压痕峰值负载，维氏硬度是压痕加载速率的单调递增函数。对于具有相同加载和卸载时间 30 s 且在压痕峰值负载处没有中间阶段的压痕，CuZrHfA 块体金属玻璃基复合材料的维氏硬度随压痕负载的增加而减小。在压痕过程中通过塑性变形耗散的应变能是压痕负载的幂律函数，幂指数为 3/2，能量比（总能量/塑性能量）随深度比（残余压痕深度/最大压痕深度）线性增加。
