Ti-48Al合金片层组织的连续粗化机制Continuous Coarsening Mechanism of Lamellar Microstructure in Ti-48Al Alloy
曹春晓,李臻熙,孙福生
摘要(Abstract):
研究了 115 0℃时效时Ti 48Al合金全片层组织的连续粗化机制。片层组织的连续粗化不仅能通过片层界面缺陷 (如台阶、端部、弯曲的界面等 )迁移来实现 ,而且可以通过γ/γ片层界面迁移或分解的方式来实现 ;在真孪晶、伪孪晶和 12 0°旋转有序型γ/γ界面当中 ,12 0°旋转有序界面的稳定性最低 ,最容易迁移或分解 ;γ片层内的 12 0°旋转有序畴界与片层界面的交汇处易形成热沟(thermalgroove) ,它往往成为片层界面发生分解的起始部位
关键词(KeyWords): TiAl合金;片层组织;连续粗化
基金项目(Foundation): 清华大学教育部先进材料开放研究实验室开放基金部分资助
作者(Author): 曹春晓,李臻熙,孙福生
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