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以等离子旋转电极球形Ti-45Al-2Cr-2Nb-0.2W预合金粉末为原料,采用等离子电火花烧结工艺在1150到1250℃范围内制备了高致密度和显微组织均匀一致的细晶钛铝基合金。烧结温度为1150℃时可获得均匀组织的α2+γ双态组织,并呈现出烧结温度范围内最高的断裂强度(1026MPa)和室温延伸率(1.12%);烧结温度为1250℃时可获得全片层α2/γ组织,烧结体的断裂强度和室温延伸率分别为953MPa和0.92%。双态组织(DP)的断裂模式是等轴γ晶内的穿晶断裂和片层晶团内的晶间断裂;而DP组织则为穿片层断裂、片层间断裂和台阶撕裂3种模式的复合模式。
Plasma-spined electrode spherical Ti-45Al-2Cr-2Nb-0.2W pre-alloyed powders were used as raw materials to prepare fine-grained titanium aluminum with high density and uniform microstructure by plasma-enhanced spark plasma sintering at 1150 to 1250 ℃. Base alloy. The α2 + γ binary microstructure with uniform microstructure was obtained at sintering temperature of 1150 ℃ and exhibited the highest breaking strength (1026MPa) and elongation at room temperature (1.12%) in the sintering temperature range. The sintering temperature of 1250 ℃ The lamellar α2 / γ microstructure, the rupture strength of the sintered body and the room temperature elongation were 953MPa and 0.92% respectively. The fracture modes of the bimodal structure (DP) are the transgranular fracture in the equiaxed γ crystal and the intergranular fracture in the lamella; while the DP tissue is the intergranular fracture, the interlamellar fracture and the step tear Mode of composite mode.