【摘要】 用轻气炮加载和冲击波测量技术测量了Ｔａ和Ｔａ－Ｗ合金在１０４／ｓ～１０６／ｓ应变率下的形变行为。根据平板冲击载荷条件，实验上建立了Ｔａ－Ｗ合金的动态响应的本构关系，测量出合金的各动力学特性参数。本研究还就Ｔａ和Ｔａ－Ｗ合金在高应变率下的塑性形变方式、Ｗ的添加和应变率对动态形变过程及动力学性能的影响进行了观察分析和讨论。更多还原

【Abstract】 The deformation behaviour of TaW alloy under the strain rates between 104/sec. and 106/sec. is studied by means of an air gun loading and shock wave measuring technique. The characterization of the alloy under the strain rates above were determined by the measurments of the shock wave propagation through the thickness of alloy targets. The results show that the value of yield strength of the alloy under the tests of air gun is almost twice the quasistatic value. Based on the experimental results and the elasticplasticfluid dynamics theory, the constitutive equation has been constructed for TaW alloy. The microstructure observation shows that the twinning is the major dynamic plastic deformation mode of Ta and TaW alloy. The influences of tungsten addition and the strain rate on the dynamic mechanical responce are also discussed in detail.更多还原