钙对Mg-8%Al镁合金组织及性能的影响  

Influence of Ca on microstructure and mechanical properties of Mg-8%Al magnesium alloy

作　　者：孙晶[1] 厉虹[1] 郭全英[1] 毛萍莉[1] 刘正[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2011年第2期125-128,152,共5页Journal of Shenyang University of Technology

基　　金：国家科技支撑计划资助项目(2008BAE63B02)

摘　　要：为了提高镁铝合金的力学性能,通过扫描电镜(SEM)、x射-线衍射仪等分析手段及室温与高温力学性能测试,研究了0.5%Ca对Mg-8%A l合金组织及力学性能的影响.结果表明,Mg-8%A l合金中加入0.5%Ca后,晶粒得到明显细化,沿α固溶体晶界分布的β-Mg17A l12相变得细小、光滑,β-Mg17A l12相周围的次生相消失;加入的钙除形成钙的化合物外,还有少量溶入β-Mg17A l12中,基体中不含钙;0.5%Ca可使Mg-8%A l合金的室温及高温力学性能得到明显提高.In order to improve the mechanical properties of magnesium-aluminum alloy,the effect of 0.5%Ca addition on the microstructure and mechanical properties of Mg-8%Al alloy was investigated by means of SEM,XRD,and mechanical property tests at room and high temperatures.The results show that with the addition of 0.5%Ca,the grains get obviously refined,and the β-Mg17Al12phase distributed along the grain boundary of α solid solution becomes small and smooth.Moreover,the secondary phase around β-Mg17Al12 phase vanishes.With the addition of Ca element,the Ca-containing compound forms,and small amount of Ca dissolves into β-Al12Mg17 phase,but Ca element does not exist in the matrix.The mechanical properties of Mg-8%Al alloy at room and high temperatures get obviously enhanced with the addition of 0.5%Ca.

关 键 词：镁合金 钙元素 组织 力学性能 β-Al12Mg17相 晶粒细化 次生相 化合物 

分 类 号：TG146.2[一般工业技术—材料科学与工程]