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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%。
Ti2AlNb-based alloy thin-walled samples were prepared on TA15 titanium alloy substrate by laser melting deposition of Ti-22Al-25Nb alloy powder. The microstructure and phase composition of Ti2AlNb-based alloy in as-deposited and heat treated state were analyzed. Tensile properties of heat-treated materials in deposition scan direction at room temperature of 25 ℃ and high temperature of 750 ℃. The results show that the dense, as-deposited and heat-treated Ti2AlNb-based alloys are composed of B2, α2 and O phases. The tensile strengths of laser-melted Ti2AlNb-based alloys at room temperature and 750 ℃ are 1012 MPa and 702MPa, elongation of 1.8% and 2.2% respectively.