摘要
测定了含Ｃｅ０．０６ｗｔ％及０．１５ｗｔ％的１４２０合金板材的时效硬化曲线及室温力学性能，分析了Ｃｅ对１４２０合金时效过程的影响。结果表明：Ｃｅ含量在０．１５ｗｔ％范围内的１４２０合金时效的组织与不含Ｃｅ的１４２０合金类似，主要强化相为δ＇及δ＇／β＇复合相。微量Ｃｅ在１４２０合金中可以减缓固溶处理时的再结晶过程及细化再结晶晶粒，并促进δ＇相在时效过程中的弥散析出。添加０．０６Ｗｔ％Ｃｅ时有利于提高合金塑性，而添加０．１５ｗｔ％Ｃｅ时则有利于提高合金强度。采用４６５℃固溶，２％预拉伸变形及１７０℃／６ｈ时效，可使含微量Ｃｅ的１４２０合金板材获得较好的综合力学性能。
he age-hardenable curves and mechanical properties at room temperature have been determined for the alloy 1420 sheets containing 0.06wt% and 0.15wt% Ce, respectively,and the effect of Ce on the age courses has been investigated.The results indicate that there are generally strengthening δ phases and duplex δ/β precipitates in the microstructure of the aged sheets containing Ce below 0.15wt%, which is about the same way as in that of the Ce-flee aged sheets. A small amount of Ce in the alloy might bring some benefits, such as delaying the recrystallization during solution treatment,reducing the grain sizes after recrystallization and promoting the precipitation of dispersive δ particles.Adding 0.06wt% Ce into the alloy will improve the ductility,while adding 0.15wt% Ce into it can enhance the strength.The alloy sheets containing minor Ce will show higher strength and ductility under the condition of solution heat treated at 465℃ and cold water quenched, then stretched about 2% and aged at 170℃ for 6h.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
1995年第1期55-60,共6页
Rare Metal Materials and Engineering
关键词
时效
铝锂合金
力学性质
铈含量
l-Li Alloy
Ce
Ageing Microstructure
Mechanical Property
