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本文主要研究了钆(Gd)和氧(O_x)元素对高温钛合金Ti-5331S显微组织和性能的影响。实验结果表明:Gd对合金的拉伸性能没有明显的影响,但却能有效地改善合金的蠕变性能;氧有助于合金室温强度的提高,但热暴露后的室温拉伸延性却随含氧量的增加而明显降低;当Gd和O_x的配比适当,例如添加0.2wt%Gd+0.2wt%O_x时,合金可以获得优良的综合力学性能,这可能与此时形成的弥散粒子细小有关。合金中的弥散粒子有几种不同的形貌:一种是随机分布的稀土氧化物Gd_2O_3;另一种是择优分布在α/β相界面上的硅化物(TiZr)_(?)Si_3;在高Gd和高O_x量的情况下,还可能存在Gd-Sn金属间化合物和有序相α_2。
In this paper, the effects of gadolinium (Gd) and oxygen (O_x) on the microstructure and properties of high temperature titanium alloy Ti-5331S were studied. The experimental results show that Gd has no significant effect on the tensile properties of the alloy, but it can effectively improve the creep properties of the alloy. Oxygen contributes to the improvement of the room temperature strength of the alloy, but the tensile ductility at room temperature When the ratio of Gd and O_x is appropriate, for example, adding 0.2wt% Gd + 0.2wt% O_x, the alloy can obtain excellent comprehensive mechanical properties, which may be related to the formation of small dispersed particles . The dispersion of particles in the alloy has several different morphologies: one is random distribution of rare earth oxides Gd_2O_3; the other is preferentially distributed in the α / β phase interface silicide (TiZr) _ (?) Si_3; in In the case of high Gd and high O_x, Gd-Sn intermetallic compounds and ordered phase α_2 may also exist.