钨含量对钨合金动态剪切性能的影响

Tungsten Content Effects on Dynamic Shear Properties of Tungsten Heavy Alloys

摘要:

利用帽形试样在Hopkinson压杆上测试钨合金动态剪切应力应变关系,研究了钨含量在90%～97%（质量分数）范围内,应变率约为10^5s^-1时,钨含量对动态剪切性能的影响.结果表明,钨含量增加,动态剪切强度随之增加,断裂应变随之降低.动态剪切强度与钨的体积分数呈线性递增关系.断口分析表明,断口表现以粘结相撕裂和钨颗粒劈裂的混合断裂,钨颗粒劈裂比例近似等于钨颗粒体积分数.

Abstract:

Dynamic shear properties of the tungsten heavy alloys containing 90% to 97% W (mass) were investigated using a hat-shaped specimen on the Hopkinson rod of Split Compression at a shear strain rate of 105 s-1. The results show that the dynamic shear strength increased and the shear strain decreased with the tungsten content increasing. The shear strength increased linearly with the increase of volume fraction of tungsten particles in the alloys. The shear fracture surface mainly exhibits tungsten grains split and matrix phase rupture, and the split proportion of tungsten particles equaled approximately to the volume fraction of tungsten particles.