激光熔化沉积Ti_2AlNb基合金的显微组织和拉伸性能  

Microstructure and Tensile Properties of Laser Melting Deposited Ti_2AlNb-Based Alloy

作　　者：刘彦涛[1] 宫新勇[1] 刘铭坤[1] 张永忠[1] 

机构地区：[1]北京有色金属研究总院复合材料中心,北京100088

出　　处：《中国激光》2014年第1期71-77,共7页Chinese Journal of Lasers

基　　金：国家973计划(2011CB606305)

摘　　要：通过激光熔化沉积同步输送的Ti-22Al-25Nb合金粉末,在TA15钛合金基板上制备出Ti2AlNb基合金薄壁试样,分析了沉积态和热处理态Ti2AlNb基合金的微观组织、相组成,测试了沿沉积扫描方向热处理态材料在室温25℃和高温750℃下的拉伸性能。结果表明,激光熔化沉积Ti2AlNb基合金组织致密,沉积态和热处理态均由B2,α2和O相组成,热处理状态下,激光熔化沉积Ti2AlNb基合金室温和750℃下抗拉强度分别为1012 MPa和702MPa,延伸率分别为1.8%和2.2%。Thin wall samples from Ti2AlNb-based alloy are deposited on TA15 titanium alloy plate by laser melting deposition of coaxially fed Ti-22Al-25Nb metallic powders. The microstructure, phase constitution for as-deposited and heat treated materials are investigated. The tensile properties along longitude direction at room temperature and 750 ℃ high temperature are tested for materials after heat treatment. The results show that laser direct deposited Ti2AlNb-based alloy is full dense. Both as-deposited and heat treated materials are composed of B2, α2 and O phases. For the deposited Ti2AlNb-based alloy after heat treatment, the tensile strength at room temperature and 750 ℃ are 1012 MPa and 702 MPa, with elongations of 1.8% and 2.2%, respectively.

关 键 词：激光技术 激光熔化沉积 TI2ALNB基合金 微观组织 力学性能 

分 类 号：TN249[电子电信—物理电子学] TF124[冶金工程—粉末冶金]