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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Creep of lamellar TiAl alloys: degradation, stabilization and design of lamellar boundaries
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Creep of lamellar TiAl alloys: degradation, stabilization and design of lamellar boundaries

机译：层状TiAl合金的蠕变：层状边界的降解，稳定化和设计

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摘要

Hard oriented PST crystals of a Ti-48 mol% Al alloy, in which the stress axis is parallel or normal to lamellar boundaries, were creep tested. The lamellar structures contain γ/α_2 boundaries and three types of γ/γ boundaries. Changes of lamellar structures in the PST crystals were examined during high-temperature exposure with (creep) or without applied stress (annealing). Coarsening and spheroidization of the lamellar structures are typical degradation processes observed experimentally. γ/γ lamellar boundaries migrate and coalesce with other γ/γ boundaries and α_2 lamellae dissolve during the high-temperature exposure. These events result in the coarsening and the spheroidization. Thermal stability of each lamellar boundary depends on its boundary type. A higher density of γ/α_2 lamellar boundaries is recommended for retarding the coarsening and the spheroidization, and thereby making a thermally stable lamellar structure. The high density of γ/α_2 boundaries is confirmed experimentally to provide good creep resistance.
机译：对Ti-48 mol％Al合金的硬取向PST晶体进行了蠕变测试，其中应力轴平行于或垂直于层状边界。层状结构包含γ/α_2边界和三种类型的γ/γ边界。在有（蠕变）或无外加应力（退火）的高温暴露过程中，检查了PST晶体中的层状结构的变化。层状结构的粗化和球化是实验观察到的典型降解过程。高温暴露期间，γ/γ层状边界迁移并与其他γ/γ边界聚结，α_2层溶解。这些事件导致粗化和球化。每个层状边界的热稳定性取决于其边界类型。建议使用较高密度的γ/α_2层状边界，以阻止粗化和球化作用，从而形成热稳定的层状结构。实验证实了γ/α_2边界的高密度，以提供良好的抗蠕变性。

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