压痕法测量Zr基非晶压力敏感因子(英文)

A New Approach to Measure the Pressure Sensitivity Index of Zr-Based Metallic Glasses Using the Indentation Tests

采用压痕法研究了两种Zr基非晶依赖于压力屈服行为,非晶的压力敏感因子可以通过对剪切带之间的夹角(2θ)测量得到.纳米压痕P-h曲线也表现出相似的结果,随着压力敏感因子而改变,这个结果与有限元模拟压痕测量的结果非常一致.剪切带之间的夹角(2θ)和纳米压痕P-h曲线都显著的依赖压力敏感因子改变而变化,这说明非晶是一种依赖于压力屈服行为.压痕实验结果依赖压力敏感因子变化行为进一步说明可以采用压痕法测量非晶压力敏感因子.

In this work, the indentation test is employed to characterise the pressure-dependent yield behavior of two Zr-based BMGs, and the pressure sensitivity index of the alloys was measured on the basis of the measurement of the included angles （ 2θ ） between two families of shear bands. The nanoindentation P-h curves of the alloys with the different pressure sensitivity indexes were measured and the results are compared with the finite element simulations. The experimental curves are in good agreement with the simulated ones. The included angles （ 2θ ） and the P-h curve depend markedly on the above index. This dependence can be exploited to determine it from indentation experiments using an inverse approach.