研究了10000h大气热暴露对不同热等静压处理状态的含钨铌TiAl合金的组织和力学性能的影响.研究发现:在长期的高温热暴露过程中,亚稳定的α2板条发生了平行于α2/γ板条界面的α2→α2+γ分解,随后在已分解成的α2+γ板条细束上发生了少量的α2+γ→B2+ω的转变.另一方面,该合金中有序共生的B2+ω偏聚物在高温热暴露过程中逐渐发生了Oswald熟化过程, 但是,B2相仍有留存.相应的力学性能测试结果表明,含钨铌TiAl合金表现出了良好的热稳定性.在10000h的长期高温热暴露后拉伸和疲劳性能均未发生明显的衰退现象.
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