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为了研究热氢处理技术对TiAl基金属间化合物Ti-45Al-5Nb-0.8Mo-0.3Y合金高温变形行为的影响规律,对未置氢和H含量为0.037%(质量分数)的铸态合金进行了等温热压缩实验,并利用SEM和TEM观察了合金压缩后的微观组织.结果表明,H可以降低合金的高温变形流动应力,细化微观组织,提高合金的热加工性能.与未置氢合金相比,在1200℃,应变速率0.01 s~(-1)变形条件下,H可使合金的峰值流动应力下降25%左右.置氢处理促进了位错运动、动态再结晶和孪生变形,并提高了β相的含量,这是置氢合金高温变形流动应力下降的主要原因.
In order to study the effect of hydrothermal treatment on the high temperature deformation behavior of TiAl based intermetallic Ti-45Al-5Nb-0.8Mo-0.3Y alloy, the as-cast alloy without hydrogen and H content of 0.037% (mass fraction) The isothermal hot compression experiment was carried out and the microstructures of the alloy after compression were observed by SEM and TEM.The results showed that H could reduce the flow stress at high temperature deformation and refine the microstructure and improve the hot workability of the alloy, Alloy can reduce the peak flow stress by about 25% at 1200 ℃ and 0.01 s ~ (-1) strain rate.Hydrogen treatment promotes dislocation, dynamic recrystallization and twin deformation, And increase the content of β phase, which is the main reason for the drop of the flow stress of the hydrogen-absorbing alloy at high temperature.