研究了Ti-50Al，Ti-45Al-10Cr和Ti-50Al-10Cr（原子分数,％）合金在800－1100℃下的高温氧化性能.结果表明，Ti－45Al－10Cr合金在800和900℃形成的氧化膜具有与TiAl合金同样的分层结构，外层为Ti02，内层为Ti02和al2O3的混合氧化物，在内外氧化层中间有一富Al2O3的中间层，但内氧化层中有大量Cr掺杂、其氧化增重比Ti-50al的大.而1000和1100℃氧化时，Ti-45Al-10Cr合金能形成连续富Al2O3层，表现较好的抗氧化性能.Ti-50Al-10Cr合金在800－1100℃均能形成保护性的Al2O3膜，同样表现较好的抗氧化性能因此，Cr对TiAl金属间化合物的抗氧化性能具有两种不同的作用.当Cr的加入不足以形成Al2O3膜时，Cr以掺杂作用为主，使TiAl的抗氧化性能降低；但当Cr的加入可以促使形成保护性的Al2O3膜时，大大提高了Tial的抗氧化性能.
The oxidation behavior of Ti-50al, Ti-45al-10Cr and Ti-50al- 10Cr (atomic fraction, %) alloys at 800-1100℃ was investigated. at 800 and 900℃, Ti-45al-10Cr alloy formed a similar layered scale with Tial, consisting of an outer layer of TiO2, an intermediate al2O3 barrier and an inner layer of a mixture of al2O3 and TiO2, exhibited larger weight gains than Ti-50al due to the dopping effect of Cr. at 1000 and 1100℃, however,Ti-45al-10Cr alloy formed a continuous al2O3 enriched scale, which had much smaller weight gains than Tial alloy. Moreover, Ti-50al- 10Cr alloy exhibited an excellent oxidation resistance at 80O-1100℃ due to the formation of a protective al2O3 scale.
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