Mechanical properties of tungsten heavy alloy and damage behaviors after hypervelocity impact
来源期刊：Rare Metals2014年第4期
论文作者：Zhe Wu Yang Zhang Chun-Mei Yang Qian-Jun Liu
文章页码：414 - 418
摘 要：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 highdynamic mechanical properties, significant temperature effects, and strain hardening behaviors. Used two-stage light gas gun, the penetration test of 93 W projectile was finished. After the completion of the test, through the microstructure observation of the residual 93 W 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 93 W display good self-sharpening property in the process of hypervelocity penetration. At the same time,the results of TEM observation show that there are highdensity dislocations at the interface between W and Ni–Fe–Co-based alloy inside the 93 W.
Zhe Wu1，Yang Zhang2，Chun-Mei Yang1，Qian-Jun Liu1
1. College of Mechanical and Electrical Engineering,Northeast Forestry University2. College of Science,Northeast Forestry University
摘 要：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 highdynamic mechanical properties, significant temperature effects, and strain hardening behaviors. Used two-stage light gas gun, the penetration test of 93 W projectile was finished. After the completion of the test, through the microstructure observation of the residual 93 W 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 93 W display good self-sharpening property in the process of hypervelocity penetration. At the same time,the results of TEM observation show that there are highdensity dislocations at the interface between W and Ni–Fe–Co-based alloy inside the 93 W.
关键词：
