摘要
A multi-step heat treatment is proposed to optimize the lamellar structure of as-cast high Nb containing TiAl alloys. The β-segregation is removed effectively after the first two step heat treatment, a short-time holding within β single phase field then annealing in α+β phase field. During the third step heat treatment, a subsequent low-temperature aging, new γ lamellae precipitate by the means of isolated nucleation or twin-related nucleation. After the proposed multi-step heat treatment, the alloy presents nano-scaled lamellar structure with the colony size about 140 μm.
源语言 | 英语 |
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页(从-至) | 35-40 |
页数 | 6 |
期刊 | Intermetallics |
卷 | 79 |
DOI | |
出版状态 | 已出版 - 1 12月 2016 |