本文系统地研究了不同Ce含量对Ti-5Al-5Mo-2Sn-0.25Si铸造合金的显微组织和机械性能的影响,以及Ce在合金中与各合金元素的关系。存在形式和强化机制等问题。微量Ce的添加对此合金的室温机械性能影响不大,但可提高合金的高温持久强度。合金的综合机械性能以含0.02—0.03％Ce为最好。添加微量Ce使高温持久强度得到提高的原因是氧化铈质点的弥散强化作用、位错亚结构的稳定化作用以及晶界净化作用等共同影响的结果。
An investigation was conducted to examine the effect of Ce addition from 0.02 to 0.24 wt-％ on the microstructure and mechanical properties of Ti-5Al-5Mo-2Sn-0.25Si cast alloy. The correlation between Ce and other alloying elements, the form and behaviour as well as the strengthening mechanism of Ce have also been studied. It is shown that the Ce addition at trace level has almost no influence on the room temperature tensile properties of the ahoy, but improves obviously its stress-rupture properties at elevated temperatures. A superior combination of its mechanical properties lies on 0.02—0.03％ Ce added. The reason why it has strengthened may be the result of the dispersion-strengthening of cerium oxide particles, the stabilization of dislocation substructures and the purification of grain boundaries.
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