Precipitation behaviors in a quenched high Nb-containing TiAl alloy during annealing

Lin Song, Xingguo Hu, Tiebang Zhang, Jinshan Li

科研成果: 期刊稿件文章同行评审

18 引用 (Scopus)

摘要

The precipitation of γ phase and heterogeneous nucleation of ωo phase within βo phase areas are common phenomena in TiAl alloys. However, detailed explanation on the corresponding phase transformation mechanisms is still lacking. In this study, the precipitation behaviors of γ and ωo phases in a quenched Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y alloy are investigated. The results show that large γ grains form after quenching whereas small γ particles can directly nucleate within the remaining βo phase during annealing. Semi-coherent interfaces are observed between γ and βo phases and the average distance between dislocations is evaluated. The heterogeneous nucleation of ωo phase at the lamellar colony boundary is imaged by HRTEM. Edge-to-edge method is used to calculate the orientation relationship between γ and ωo phases. The γ phase grows up faster than ωo phase within the βo phase areas during annealing at 800 °C.

源语言英语
页(从-至)79-85
页数7
期刊Intermetallics
89
DOI
出版状态已出版 - 10月 2017

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