摘要
研究了微量Ｃｅ对２０９０铝锂合金疲劳和断裂韧性的影响，以及Ｃｅ的外韧化与内韧化机制。结果表明，在２０９０合金中添加微量Ｃｅ可显著改善疲劳寿命和断裂韧性，主要归因于Ｃｅ的内韧化效应，即细化和弥散化Ｔ１相的作用。同时，Ｃｅ可抑制再结晶，减少再结晶分量和细化未再结晶晶粒，增强外韧化效应。
The influence of rare earth element Ce on fatigue properties and fracture toughness for Al-Li alloy 2090 was studied, and the mechanism of extrinsic toughening and instrinsic toughening from Ce was explored. A singnificant improvement in ductility, fatigue life and fracture toughness can be achieved by adding minor Ce into alloy 2090, which is primarily attributed to intrinsic toughening effect from Ce, i.e., the role of thinning and dispering T1 phase. On the other hand, due to the role of restraining recrystallization by adding Ce, the fraction of recrystallized grains is decreased and the unrecrystallized grains are thinned. It is responsible for enhancing extrinsic toughening effect.
出处
《中国稀土学报》
CAS
CSCD
北大核心
1998年第2期178-180,共3页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金
航空科学基金
军用新材料预研究资助
关键词
铈
铝锂合金
疲劳机制
断裂机制
Rare earths, Cerium, Al-Li alloy, Fatigue mechanism, Fracture mechanism
