80W-Cu合金力学行为的拉压不对称性研究

在不同加载应变率下，对熔渗法制备的80W-Cu合金进行压缩和拉伸力学性能研究，对比分析应力状态对80W-Cu合金力学行为的影响规律。结果表明，80W-Cu合金在准静态和动态加载条件下的力学行为均具有明显的拉压不对称性，在压缩加载条件下80W-Cu合金具有良好的塑性，而在拉伸加载条件下材料的塑性极差。微观分析表明，80W-Cu合金具有高的钨-钨连接度，在拉伸加载时钨-钨界面极易发生开裂，导致材料破坏，因此塑性变形能力极差；而在压缩加载时钨骨架发生坍塌变形，塑性良好的铜在压应力的作用下发生延性流动，填充到钨-钨界面之间，从而使材料具有良好的塑性变形能力

Asymmetry between Compression and Tensile Properties of 80W-Cu Alloy

The quasistatic properties and dynamic properties of 80W-Cu alloy in different loading conditions were studied, and the influence of stress state on mechanical properties of the alloy was analyzed. The results show that there exists an obvious asymmetry between compression and tensile properties of 80W-Cu alloy. In the compression process, 80W-Cu alloy exhibits good ductility while in the tensile process the material shows extremely poor ductility. Micro-analysis shows that the high W-W contiguity makes the failure easy to occur under tensile stress, which causes poor ductility of 80W-Cu alloy, while in the compression process, the whole deformation is well coordinated by the abruption of W skeleton and the plastic deformation of Cu phase, which results in good ductility of 80W-Cu alloy