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采用机械合金化及放电等离子烧结方法制备超细晶/纳米晶TiAl基合金,并利用差热分析仪进行循环高温氧化试验,研究粉末机械合金化对烧结细晶粒TiAl基合金组织及高温氧化性能的影响。结果表明,球磨是获得细晶粒组织的原因,粉末经球磨及放电等离子烧结后,形成了细小、球状的TiAl和Ti3Al相组织;该细晶粒组织在高温循环氧化条件下显示出较高的抗氧化性,且随Nb量增加抗氧化性得到提高,升温阶段的氧化速率最快。
The ultrafine-grained / nanocrystalline TiAl-based alloys were prepared by mechanical alloying and spark plasma sintering. The high-temperature oxidation tests were carried out by differential thermal analyzer. The effects of mechanical alloying on the microstructure and high-temperature oxidation properties Impact. The results show that the ball milling is the reason for the fine grained microstructure. After the ball milling and discharge plasma sintering, the fine and spherical TiAl and Ti3Al phases are formed. The fine grained microstructure shows high Oxidation resistance, and with the increase of Nb oxidation resistance is improved, the oxidation stage of the fastest warming rate.