【摘 要】
：
A novel α+β titanium alloy with multi-alloying addition was designed based on the cluster formula 12[Al-Ti12](AlTi2)+5[Al-Ti14](AlV1.2Mo0.6Nb0.2) which was derived from Ti-6Al-4V. The nominal composition of this novel alloy was determined as Ti-6.83Al-2.2
【机 构】
：
Shenyang Research Institute of Foundry Co.,Ltd.,Shenyang 110022,China;State Key Laboratory of Light
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A novel α+β titanium alloy with multi-alloying addition was designed based on the cluster formula 12[Al-Ti12](AlTi2)+5[Al-Ti14](AlV1.2Mo0.6Nb0.2) which was derived from Ti-6Al-4V. The nominal composition of this novel alloy was determined as Ti-6.83Al-2.28V-2.14Mo-0.69Nb-6.79Zr. In this study, the novel alloy and Ti-6Al-4V alloy samples were prepared by laser additive manufacturing. The microstructure, micro-hardness, room/high temperature tensile properties of the as-deposited samples were investigated. Compared to Ti-6Al-4V, the novel alloy has much higher room and high temperature (600 oC) tensile strengths, which are 1,427.5 MPa and 642.2 MPa, respectively; however, it has a much lower elongation (3.2％) at room temperature because of the finer microstructure. To improve the elongation of the novel alloy, heat treatment was used. After solution at 960 oC or 970 oC for 1 h followed by air cooling and aging at 550 oC for 4 h followed by air cooling, a unique bi-modal microstructure which contains crab-like primary α and residual β phase is obtained, improving the compression elongation by 80.9％ compared to the as-deposited samples. The novel alloy can be used as a high-temperature and high-strength candidate for laser additive manufacturing.
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