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首页> 外文期刊>Scripta materialia >Estimation of ( gamma + alpha sub 2 ) equilibrium in two-phase Ti-Al-X alloys by means of sublattice site occupancies of X in TiAl and Ti sub 3 Al
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Estimation of ( gamma + alpha sub 2 ) equilibrium in two-phase Ti-Al-X alloys by means of sublattice site occupancies of X in TiAl and Ti sub 3 Al

机译：利用TiAl和Ti sub 3 Al中X的亚晶格位点占有率估算两相Ti-Al-X合金中的（gamma + alpha sub 2）平衡

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摘要

A theoretical model that relates the ( gamma + alpha sub 2 ) two-phase equilibrium in ternary Ti-Al-X alloys to the substitution behavior of alloying elements in the two ordered phases has been suggested. The method uses experimentally measured occupation probabilities of the alloying elements on different sublattices as input, and allows estimates of the mole fractions of the two phases for a given alloy composition. Predictions of the stabilising effects on the gamma or alpha sub 2 phase of Nb, Ta, Cr, Mo, W etc. are made using site occupancy data measured in the author's group and elsewhere, and are compared with independent phase stabilisation results. Good agreement has been reached. In particular, the variation in the stabilising effect of Cr is explained by the strong composition dependence (especially on Ti/Al ratio) of the site occupancy of Cr in the gamma phase. The model has been validated by comparing predictions with experimentally measured phase fractions and phase boundaries, using a variety of ternary Ti-Al-X alloys.
机译：提出了将三元Ti-Al-X合金中的（γ+ alpha sub 2）两相平衡与合金元素在两个有序相中的取代行为相关的理论模型。该方法使用实验测量的合金元素在不同亚晶格上的占据概率作为输入，并允许估算给定合金成分下两相的摩尔分数。 Nb，Ta，Cr，Mo，W等对Nb，Ta，Cr，Mo，W等的γ或alpha sub 2相稳定作用的预测是使用在作者小组和其他地方测量的站点占用数据得出的，并与独立的相稳定结果进行了比较。已达成良好协议。尤其是，Cr的稳定作用的变化是由γ相中Cr的位置占有率的强成分依赖性（尤其是Ti / Al比）所引起的。通过使用多种三元Ti-Al-X合金将预测值与实验测量的相分数和相界进行比较，从而验证了该模型的有效性。

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