中文摘要：

将TA15和Ti_2AlNb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%Ti_2AlNb,50%TA15＋50%Ti_2AlNb,60%TA15＋40%Ti_2AlNb（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。

英文摘要：

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 depo-sition 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 a phase and a2 phase distributing within primary p/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 a 2 phases is visible on tensile fracture surface, and the fracture mode is subject to cleavage fracture.