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进行了10一27 GPa应力范围内Zr_(51)Ti_5 Ni_(10)Cu_(25)Al_9金属玻璃的平面冲击实验以研究其高压-高应变率加载下的塑性行为.由样品自由面粒子速度剖面的分析获得了冲击加载过程的轴向应力,并通过轴向应力与静水压线的比较获得剪应力.实验结果表明,尽管存在明显的松弛效应,但Zr基金属玻璃的Hugoniot弹性极限随着冲击应力的增加而增加.然而,塑性波阵面上的剪应力则显示先硬化而后软化现象,而且软化的幅度随冲击应力的增加而增加.冲击加载下Zr基金属玻璃的上述剪应力变化特征与分子动力学模拟结果比较一致,但与压剪实验结果和一维应力冲击实验结果明显不同.
The plane impact experiments of Zr 51 Ti 5 Ni 10 Cu 25 Al 9 glass were carried out to study the plastic behavior under high pressure and high strain rate.The results of the experiments show that the free surface particle velocity profile , The axial stress of the impact loading process was obtained and the shear stress was obtained by comparing the axial stress with the hydrostatic pressure.The experimental results show that Hugoniot elastic limit of Zr-based metallic glass, with the obvious relaxation effect, However, the shear stress on the plastic wavefront shows the first hardening and then softening phenomenon, and the softening amplitude increases with the increase of the impact stress.Characteristics of the shear stress of the Zr-based metallic glass under impact loading Which is in good agreement with the results of molecular dynamics simulation. However, the results are obviously different from those of the compression-shear test and the one-dimensional stress-impact test.