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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of microstructure on creep deformation of 45XD TiAl alloy at low and high stresses
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Effect of microstructure on creep deformation of 45XD TiAl alloy at low and high stresses

机译：显微组织对45XD TiAl合金在低应力和高应力下蠕变变形的影响

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摘要

A stabilized fully lamellar (stabilized FL) structure and a nearly lamellar (NL) structure were prepared by selected heat treatments in a Ti-45Al-2Nb-2Mn (wt.%) + 0.8 vol.% TiB_2 (45XD) alloy. Tensile creep tests were performed at 760 ℃ using applied stresses of 138 and 207 MPa. The stabilized FL structure exhibits a lower minimum creep rate and a longer rupture life compared to the NL structure at both stress levels. More γ grains in the NL structure hasten dynamic recrystallization and the onset of grain boundary sliding (GBS), especially at high creep stress. GBS further accelerates microstructural degradation and increases the creep strain rate. However, dynamic recrystallization and GBS are greatly delayed in the stabilized FL structure. The finer lamellar spacing also decreases the creep strain rate. These results demonstrate that the γ grains have a great effect on microstructural instability and creep resistance of TiAl alloys.
机译：通过在Ti-45Al-2Nb-2Mn（wt。％）+ 0.8 vol。％TiB_2（45XD）合金中进行选定的热处理，制备了稳定的完全层状（稳定的FL）结构和几乎层状（NL）的结构。使用138和207 MPa的应力在760℃进行拉伸蠕变试验。与两种应力水平下的NL结构相比，稳定的FL结构均具有更低的最小蠕变速率和更长的断裂寿命。 NL结构中更多的γ晶粒会加速动态再结晶，并开始出现晶界滑动（GBS），特别是在高蠕变应力下。 GBS进一步加速了微结构降解并提高了蠕变应变率。但是，在稳定的FL结构中，动态重结晶和GBS大大延迟了。较细的层状间距也降低了蠕变应变率。这些结果表明，γ晶粒对TiAl合金的组织不稳定性和抗蠕变性具有很大的影响。

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