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利用光学显微镜，研究了冷却速度对锻造Ｔｉ４８Ａｌ２Ｃｒ（原子数分数，％）组织演变的影响．结果表明：冷却速度主要影响锻造ＴｉＡｌ基合金组织演变产物的形貌，而对晶团尺寸的影响较小．锻造ＴｉＡｌ基合金在α相转变温度θα以上等温热处理后，采用炉冷、空冷、油冷和水冷，会依次转变为全层状组织、层状组织加魏氏体组织、块状转变组织加魏氏体组织、块状转变组织加羽毛状组织
The effect of cooling rate on the microstructure evolution of Ti48Al2Cr (atomic fraction,%) was studied by optical microscope. The results show that the cooling rate mainly affects the morphology of the forged TiAl-based alloy, but has little effect on the size of the ingot. Forged TiAl-based alloy isothermally heat-treated at αα transformation temperature above θα, and then cooled to furnace temperature, air-cooled, oil-cooled and water-cooled, and then transformed to full-layered structure, Plus Wei body tissue, massive transformation of the organization plus feathery tissue