(1. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001；
2. 哈尔滨工业大学 金属精密热加工国家级重点实验室，哈尔滨 150001)
摘 要: 采用熔模铸造工艺制备ZrO2面层的型壳，离心浇注Ti-47Al和Ti-48Al-2Cr-2Nb合金，采用扫描电镜和显微硬度计研究两种合金的界面反应程度；将浇注的合金试样进行800 ℃高温氧化实验，并通过扫描电镜分析两种合金抗氧化能力的强弱。结果表明：对于Ti-48Al-2Cr-2Nb合金，其界面层处锯齿状起伏小，粘砂层较薄，反应层硬化程度较低，其在高温氧化后氧化层表面致密，氧化层较薄；Ti-48Al-2Cr-2Nb合金在界面的反应程度和抗氧化性能均优于Ti-47Al合金的。
关键字: TiAl合金；熔模铸造；界面反应；抗氧化性能
（1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China）
Abstract:Ti-47Al and Ti-48Al-2Cr-2Nb alloys were cast in mould shells whose surface refractory material was ZrO2, and the interface reaction of these two kinds of alloys were analyzed by SEM and microhardness tester. The high temperature oxidation resistance of the cast samples at 800 ℃ was studied. The high temperature oxidation resistances of these two alloys were also analyzed by SEM. The results show that Ti-48Al-2Cr-2Nb alloy has thinner burnt-on sand layer, less ups and downs of surface and lower reaction hardening. Ti-48Al-2Cr-2Nb alloy has denser and thinner oxidation layer. Ti-48Al-2Cr-2Nb alloy has better property in interface reaction and oxidation resistance than Ti-47Al alloy.
Key words: TiAl alloy; investment casting; interface reaction; oxidation resistance
