Abstract The effect of Sn addition on the oxidation behavior of high-Nb containing TiAl alloys was investigated with isothermal oxidation tests conducted in static air at 1000 °C. Sn addition can improve the high-temperature oxidation resistance of TiAl alloys by forming a protective Ti3Sn layer to diminish the inward oxygen diffusion. Moreover, the generated Al2O3 oxide pegs provide a mechanical locking to enhance the spallation resistance. The alloy containing 3 at.% Sn exhibits superior oxidation resistance, with no spallation occurring. The lowest mass gain after being oxidized for 100 h was 3.29 mg/cm2, which is 42.1 % lower than the Sn-free alloy.

中文翻译：

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添加Sn对高含Nb TiAl合金高温氧化行为的影响

摘要 通过在 1000 °C 静态空气中进行的等温氧化试验，研究了 Sn 添加对高 Nb TiAl 合金氧化行为的影响。添加Sn可以通过形成保护性Ti3Sn层来减少向内的氧扩散来提高TiAl合金的高温抗氧化性。此外，生成的 Al2O3 氧化物钉提供机械锁定以增强抗散裂性。含有 3 at.% Sn 的合金表现出优异的抗氧化性，不会发生散裂。氧化 100 小时后的最低质量增益为 3.29 mg/cm2，比无锡合金低 42.1%。