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Correlation between creep activation parameters and microscopic dislocation behaviour in γ TiAl alloys

机译:γTiAl合金蠕变激活参数与微观位错行为的相关性。

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摘要

The creep properties of an as-cast Ti_(48)Al_(48)Cr_2Nb_2 alloy have been studied at 750℃ and 150 MPa. The activation parameters have been measured by stress jumps during the creep test. TEM analyses have been performed to determine the rate-controlling deformation mechanism. Creep is controlled by the mixed climb of ordinary dislocations, which combines climb and glide components. It is shown that that the stress dependence of the creep rate is correlated to this mechanism.
机译:研究了铸态Ti_(48)Al_(48)Cr_2Nb_2合金在750℃和150 MPa下的蠕变性能。激活参数已通过蠕变测试过程中的应力跳跃进行了测量。已经进行了TEM分析以确定速率控制变形机理。蠕变由普通位错的混合爬升控制,该爬升结合了爬升和滑移成分。结果表明,蠕变速率的应力依赖性与该机制有关。

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