Evolution of B2(ω) region in high-Nb containing TiAl alloy in intermediate temperature range
Evolution of B2(ω) region in high-Nb containing TiAl alloy in intermediate temperature range
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高Nb TiAl合金中B2(α)区在中温范围内的演变
DOI：
10.1016/j.intermet.2016.11.007
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发表时间：
2017-03
期刊：
影响因子：
4.4
通讯作者：
Hengzhi Fu
中科院分区：
文献类型：
--
作者：
Xuyang Wang;Jieren Yang;Lin Song;Hongchao Kou;Jinshan Li;Hengzhi Fu
研究了Ti-45 Al-8.5 Nb-（W，B，Y）（at.%）合金中B2（ω）区的中温热稳定性。合金进行了研究。首先，在1100℃/1 h后，接着水淬，获得不含ω相的“纯B2区”。然后分别在700℃、800℃和850℃下热处理1 h和96 h。结果表明，B2在700℃时分解为4种ωo变体和g相，但随着时效时间的延长，只剩下一种ωo变体。随着加热温度的升高和处理时间的延长，ωo粒子的尺寸明显增大。在800℃时发生B2/γ相变，γ相优先在B2区边界形核。γp在96 h后进一步粗化至微米级。当退火温度升高到850℃时，B2基体中没有γ相生成，这可能是由于W元素影响了B2基体中γ相的生成。讨论了B2（ω）区的相变机制，包括B2 / ω 0和B2 / γ。
The thermal stability of the B2(ω) region within an intermediate temperature range in a Ti-45Al-8.5Nb-(W, B, Y) (at.%) alloy was investigated. First, the “pure B2 region” without the ω phase was obtained after 1100℃/1 h followed by water quenching. Then, the samples were heat treated at 700℃, 800℃ and 850℃ for 1 h and 96 h respectively. The results show that B2 decomposes into four types of ωo variants and g phase at 700℃; but only one ωo variant would remain as the ageing time increased. The size of the.ωo particles obviously increases with the increase of heating temperature and treating time. It is also found that the phase transformation of B2/γ occurred at 800℃ and the γ phase prefers to nucleate at B2 region boundaries. γp would further coarsen to micron size after 96 h. In contrast, no γ phase in the B2 matrix is observed when the annealing temperature increases to 850℃, which could be attributed to the influence of W element on the formation of γ phase in B2 phase. Phase transformation mechanisms in the B2(ω) region, involving B2 / ωo and B2 / γ, were discussed.
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