摘要
采用OM、XRD、SEM等方法研究了不同Ca含量对Mg-3.5Al-0.4Sr-0.5Mn合金显微组织和力学性能的影响。结果表明,铸态合金的显微组织主要包括α-Mg相和β-Mg17Al12相。加入适量碱土金属Ca后,部分Ca溶到β相中,并有新相Al2Ca生成。随着Ca含量的增加,合金的强度和断后伸长率均呈先增大后减小的趋势,且都在1.0%Ca时达到最高。
The effect of calcium element on microstructure and mechanical properties of Mg-3.5Al-0.4Sr-0.5Mn alloys was investigated by means of OM, XRD and SEM etc.The results indicate that microstructure of the as-cast alloys is mainly composed of α-Mg phase andβ-Mg17Al12 phase.After adding appropriate content of alkaline-earth metal Ca, part of it melts into the beta phase, and generates a new phase of Al2 Ca.With the increasing of Ca content, both the strength and elongation of the alloys firstly increase and then decrease, which all reachs the best point with 1.0%content of Ca.
出处
《金属热处理》
CAS
CSCD
北大核心
2015年第1期51-54,共4页
Heat Treatment of Metals
基金
太原科技大学博士启动基金(20122011)
关键词
镁合金
CA
铸态组织
混合焓
力学性能
magnesium alloy
calcium
as-cast microstructure
mixing enthalpy
mechanical property
