Ca含量对时效态Mg-6.5Al-xCa-1Sn-0.3Sr镁合金显微组织和性能的影响  

Effect of Ca Content on Microstructure and Properties of As-Aged Mg-6.5Al-xCa-1Sn-0.3Sr Magnesium Alloys

作　　者：热焱 邱克强[2] RE Yan;QIU Ke-qiang(Department of Mechanical and Electronic Engineering,College of Liaoning Provincial Communications,Shenyang 110122,Liaoning,China;School of Materials Science and Engineering,Shenyang University of Technology,Shenyang110870,Liaoning,China)

机构地区：[1]辽宁省交通高等专科学校,辽宁沈阳110122 [2]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《铸造》2024年第4期503-508,共6页Foundry

基　　金：辽宁省教育厅科研基金(LJKMZ20222117)。

摘　　要：通过XRD、SEM和性能测试研究了Ca含量的变化对时效态Mg-6.5Al-xCa-1Sn-0.3Sr(x=1,1.5,2,2.5)镁合金的显微组织和性能的影响。结果表明,时效态合金主要由α-Mg和Al_(2)Ca相组成,Al_(2)Ca相成网状分布。合金的抗拉强度和伸长率随着Ca加入量的增加而逐渐降低,当Ca含量为1%时合金的拉伸性能最佳,而合金的硬度随着Ca的加入而增加。在175℃、70 MPa下,Ca的添加使时效态合金的稳态蠕变速率降低。The effect of Ca content on the microstructure and properties of as-aged Mg-6.5Al-xCa-1Sn-0.3Sr(x=1,1.5,2,2.5)magnesium alloys were investigated by XRD,SEM and properties tests.The results showed that as-aged alloys mainly consist ofα-Mg and Al_(2)Ca phases,the addition of Ca causes the Al_(2)Ca phase in as-aged alloys to coarsen into a network.The tensile strength and elongation of as-aged alloys gradually decreased with the addition of Ca,when the Ca content was 1.0wt.%,the tensile properties of as-aged alloys were the best,but the hardness of as-aged alloys increased with the addition of Ca.At 175℃,70 MPa,the steady-creep rate of as-aged alloys were reduced with Ca addition.

关 键 词：Mg-Al-Ca-Sn-Sr镁合金 显微组织 力学性能 蠕变性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]