激光金属沉积Ti-Zr-Ta合金的制备及其冲击释能特性研究

难熔金属型含能结构材料（ESMs）具有良好的力学性能和优异的冲击释能特性，但由于组元熔点高，利用传统的熔炼铸造法难以制备出大尺寸无缺陷铸件。本研究利用等离子旋转电极雾化制粉技术制备出Ti-Zr-Ta难熔合金粉末，结合激光金属沉积（LMD）技术制备了Ti-Zr-Ta难熔金属型ESMs，并对其组织结构、力学性能和冲击释能特性进行研究。结果表明，利用LMD技术可实现Ti-Zr-Ta难熔金属型ESMs的致密化成型，合金致密度达到98.75%，具有良好的力学性能，其准静态抗拉强度达到1202MPa。弹道枪试验结果表明，在1202m/s的冲击速度下，激光金属沉积Ti-Zr-Ta合金在27 L密闭靶箱内可产生0.144 MPa的准静态压力，释能特性优良。

Impact initiated energy release characteristics of Ti-Zr-Ta alloy prepared by laser metal deposition

Refractory metal energetic structural materials (ESMs) have good mechanical properties and excellent impact initiated energy release characteristics. However, due to the high melting point of refractory elements, it is difficult to fabricate large size defect-free castings by traditional methods of melting and casting. In this paper, Ti-Zr-Ta refractory alloy powders were prepared by plasma rotating electrode processing technology, and Ti-Zr-Ta refractory metal ESMs was prepared by laser metal deposition (LMD) technology. The microstructure, mechanical properties and impact initiated energy release characteristics of Ti-Zr-Ta refractory metal ESMs were studied. The results show that the densification of Ti-Zr-Ta refractory metal ESMs can be achieved by LMD technology and the density of alloy reaches 98.75 %. The alloy has good mechanical property, the quasi-static tensile stress reaches 1202 MPa. Ballistic gun experiments imply that Ti-Zr-Ta alloy prepared by laser metal deposition can generate quasi-static pressure of 0.144 MPa in 27 L airtight target chamber at the impact velocity of 1202 m/s, which reveals excellent energy release characteristics.