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首页> 外文会议>Symposium Proceedings vol.842; Symposium on Integrative and Interdisciplinary Aspects of Intermetallics; 20041129-1201; Boston,MA(US) >On the Effects of Interstitial Elements on Microstructure and Properties of Ternary and Quaternary TiAl based alloys
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On the Effects of Interstitial Elements on Microstructure and Properties of Ternary and Quaternary TiAl based alloys

机译：间隙元素对三元和四元TiAl基合金组织和性能的影响

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摘要

Ti-Al-Cr ternary and Ti-Al-Cr-Nb quaternary alloys have been studied as a function of initial purity and added interstitial content. Using strict clean processing together with either ultra high purity or commercial purity alloys, the effects of interstitial elements (essentially O, but also C and N) on microstructure and hardness, yield stress and fracture strain have been studied for both fully lamellar microstructures and duplex microstructures. The results are clear and similar trends are observed: as long as they do not precipitate, these stabilise the lamellar microstructure and affect the kinetics of the α-γ phase tranformation, leading to a higher than equilibrium value for the γ _2 phase for continuous cooling. Both the lamellar spacing and the γ _2 phase fraction correlate with increased hardness and yield stress, and also with decreasing fracture strain. The effects are significant.
机译：研究了Ti-Al-Cr三元和Ti-Al-Cr-Nb四元合金作为初始纯度和增加的间隙含量的函数。使用严格的清洁工艺以及超高纯度或商业纯度的合金，已经研究了全层状微结构和双相组织中间隙元素（本质上是O，还有C和N）对组织和硬度，屈服应力和断裂应变的影响。微观结构。结果很明显，并且观察到了类似的趋势：只要它们不沉淀，就可以稳定片状微结构并影响α-γ相转变的动力学，从而导致连续冷却的γ_2相的平衡值高于平衡值。 。层间距和γ_2相分数都与增加的硬度和屈服应力相关，并且与减小的断裂应变相关。效果显着。

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