Mechanical properties of tungsten heavy alloy and damage behaviors after hypervelocity impact
Mechanical properties of tungsten heavy alloy and damage behaviors after hypervelocity impact
复制标题
DOI：
10.1007/s12598-014-0320-5
复制
发表时间：
2014-06
期刊：
影响因子：
8.8
通讯作者：
Zhe Wu;Yang Zhang;Chunguagn Yang;Qian-Jun Liu
中科院分区：
文献类型：
--
作者：
Zhe Wu;Yang Zhang;Chunguagn Yang;Qian-Jun Liu
采用粉末冶金法制备了93W-4.5Ni-1.5Fe-1Co (W)，并用高温分离式霍普金森压杆（SHPB）测试了该材料的高温动态力学性能。结果表明，该材料具有较高的动态力学性能、显著的温度效应和应变硬化行为。采用两级轻气炮，完成了93W弹的侵彻试验。试验完成后，通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对残余93W弹丸进行微观结构观察，可以发现弹丸表面存在明显的热熔现象，弹丸内部存在大量绝热剪切带，绝热剪切带末端存在微裂纹。试验结果表明，绝热剪切是造成弹体破坏的主要形式，正是绝热剪切现象的出现，使得93W在超高速侵彻过程中表现出良好的自锐性能。同时，TEM观察结果表明，93W内部W与ni - fe - co基合金界面处存在高密度位错。
93W-4.5Ni-1.5Fe-1Co (W) was prepared by powder metallurgic method, and then dynamic mechanical properties of this material were tested at high temperature by means of high-temperature split Hopkinson pressure bar (SHPB). The results show that the material possesses high-dynamic mechanical properties, significant temperature effects, and strain hardening behaviors. Used two-stage light gas gun, the penetration test of 93W projectile was finished. After the completion of the test, through the microstructure observation of the residual 93W projectiles with the aid of scanning electron microscopy (SEM) and transmission electron microscopy (TEM), it can be found that there are obvious signs of hot melt existing on the surface of the projectile, a lot of adiabatic shear bands inside the projectile, and microcracks exist at the end of adiabatic shear bands. The test results show that adiabatic shear is the main form to cause the projectile failure and it is the emergence of the adiabatic shearing phenomenon that makes 93W display good self-sharpening property in the process of hypervelocity penetration. At the same time, the results of TEM observation show that there are high-density dislocations at the interface between W and Ni–Fe–Co-based alloy inside the 93W.