摘要
通过研究热处理工艺对Al-Mg-Si-Zr-Er合金组织与性能的影响,确定了合金板材的峰时效热处理工艺,探讨了合金的析出与强化行为。研究结果表明:540℃固溶1 h后,合金板材的析出相得到充分溶解,再结晶组织也未发生明显粗化;时效时,合金的析出相主要为Mg2Si、Al Cu Mg Si(Q相)和Cu Al2等;Er和Zr元素的加入促进了β″相析出,并使β″相变得更为细小弥散,从而缩短了时效时间,提高时效强化效果;合金的峰时效工艺为540℃固溶1 h,180℃时效5 h;合金的时效强化是位错切过机制和绕过机制的综合作用;合金的较高强度源于合金凝固组织细化、Al3(Er,Zr)粒子的弥散强化以及Er和Zr元素的加入促进β″相析出细化等共同作用的结果。
Influence of heat treatment on microstructure and mechanical properties of Al-Mg-Si-Zr-Er alloy was investigated,peak aging（ T6） parameters was determined,and the precipitation and strengthening behavior of the alloy was examined. The results show that after the solution treatment at 540 ℃ for 1 h the precipitation phases in the alloy sheets are completely dissolved,and the recrystallized microstructure is not coarsened. After aging treatment the precipitation phases in the alloy mainly are Mg2 Si,Al Cu Mg Si（ Q phase）,and Cu Al2. The addition of Er and Zr element accelerates the dispersively precipitation of the fine β″ phase,the aging time is shortened and the effect of aging strengthening is enhanced. The parameters of peak aging treatment of Al-Mg-Si-Zr-Er alloy sheets is solution-treated at540 ℃ for 1 h,and then aged at 180 ℃ for 5 h. The aging strengthening of the alloy is due to dislocation cutting and by passing the precipitates（ Orowan mechanism）. The high strength of the alloy sheets is ascribed to the solidification microstructure refining,the dispersion strengthening of Al3（ Er,Zr） particles and the refining of β″ phase by the addition of Er and Zr element.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第11期40-46,共7页
Transactions of Materials and Heat Treatment
基金
辽宁省第三批特聘教授支持计划
