采用真空自耗电极电弧炉熔炼技术、均匀化热处理、热等静压处理以及包套锻造工艺制备了大尺寸双态组织(DP组织)Ti-43Al-9V-Y合金锻坯, 切取适量锻坯在1 350 ℃保温8 h后得到全片层组织(FL组织),在室温, 700, 750, 800, 900 ℃下对两种组织合金不同位置处的试样进行拉伸试验, 并对断口形貌进行观察。结果表明: DP组织合金的均匀性较好, 不同位置处的拉伸性能无明显差异; 在室温～700 ℃范围内, 随着温度的升高, 合金的屈服强度略有下降, 但仍保持在较高水平; 在700～900 ℃范围内, 随着温度的升高, 合金的屈服强度迅速下降, 700 ℃时, DP组织和FL组织合金的平均伸长率分别为8.3%和2.05%, 当温度高于700 ℃以后, 合金开始呈现出软化趋势, 800 ℃的拉伸断口表面可见韧窝及明显的氧化膜。

The large-sized Ti-43Al-9V-Y alloy pie with duplex (DP) structure was produced by vacuum consumable electrode arc furnace remelting, homogenizing treatment, hot isostatic pressure and hot-pack forging process, and the fully lamellar (FL) structure was obtained after the pie was treated at 1 350 ℃ for 8 h, Tensile properties of the alloy with DP and FL structure at different positions were performed at room temperature, 700, 750, 800 and 900 ℃. The fracture morphology of tensile samples were observed. The results show that, the tensile properties of different position of DP structure were nearly the same owing to uniform microstructure. From room temperature to 700 ℃, the yield strength decreased slightly and kept a high level. From 700 ℃ to 900 ℃, the yield strength decreased rapidly with the increase of temperature. At 700 ℃, the average elongation of the alloys with DP structure and FL structure were 8.3% and 2.05%. When temperature was over 700 ℃, the alloys showed softening trend. Dimples and apparent oxidizing coating were found on tensile fracture surfaces at 800 ℃.