将TA15和Ti2AlNb合金粉末以不同比例预混,采用激光熔化沉积工艺,制备出40%TA15+60%Ti2AlNb,50%TA15+50%Ti2AlNb,60%TA15+40%Ti2AlNb (质量分数)3种比例的合金薄壁,分析了薄壁的成分、组织及力学性能.结果表明:3种沉积薄壁的成分分布均匀,合金由α相、α2相及β/B2相组成,针状α相和α2相呈网篮状分布在初生β/B2晶粒内部;3种合金的抗拉强度分别为1108 MPa,1071 MPa,1105 MPa,断裂伸长率分别为3.0%,2.2%,3.8%;拉伸断口可见沿α2相撕裂产生的撕裂棱,断裂方式均为准解理断裂.
Three different proportions of TA15 and Ti2AlNb alloy powde were premixed and thin-walls with proportions of 40%TA15+60%Ti2AlNb,50%TA15 +50% Ti2AlNb and 60%TA15+40%Ti2AlNb (mass fraction) were prepared by using laser melting deposition process.The composition,microstructure and mechanical properties of the three thin-walls were analyzed.The results indicate that the compositions of all the three kinds of alloys are uniform.The alloy appears as basketweave microstructure with acicular α phase and α2 phase distributing within primary β/B2 grain.Tensile strength of the three kinds of alloys are 1108 MPa and 1071 MPa,1105 MPa,and elongation are 3.0%,2.2% and 3.8% respectively;Tear ridge along α2 phases is visible on tensile fracture surface,and the fracture mode is subject to cleavage fracture.
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