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首页> 外文期刊>Scripta materialia >Estimation of (γ+α2 ) equilibrium in two-phase Ti-Al-X alloys by means of sublattice site occupancies of X in TiAl and Ti 3 Al.
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Estimation of (γ+α2 ) equilibrium in two-phase Ti-Al-X alloys by means of sublattice site occupancies of X in TiAl and Ti 3 Al.

机译：利用TiAl和Ti 3 Al中X的亚晶格位点占有率估算两相Ti-Al-X合金中的（γ+α2）平衡。

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摘要

A theoretical model that relates the(γ+α2 ) two-phase equilibrium in ternary Ti-Al-Xalloys to the substitution behavior of alloyingelements in the two ordered phases has beensuggested. The method uses experimentallymeasured occupation probabilities of the alloyingelements on different sublattices as input, andallows estimates of the mole fractions of the twophases for a given alloy composition. Predictionsof the stabilising effects on the gamma or alphasub 2 phase of Nb, Ta, Cr, Mo, W etc. are madeusing site occupancy data measured in the author'sgroup and elsewhere, and are compared withindependent phase stabilisation results. Goodagreement has been reached. In particular, thevariation in the stabilising effect of Cr isexplained by the strong composition dependence(especially on Ti/Al ratio) of the site occupancyof Cr in the γphase. The model has been validatedby comparing predictions with experimentallymeasured phase fractions and phase boundaries,using a variety of ternary Ti-Al-X alloys.
机译：提出了将三元Ti-Al-Xalloys中的（γ+α2）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不同亚晶格上合金元素的职业概率作为输入，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alphasub 2相稳定作用的预测是使用作者小组和其他地方测量的位置占用数据进行的，并在独立的相稳定结果中进行了比较。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）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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