Ca含量对Mg-Zn-Gd-Ca系合金轧制板材组织与性能的影响  

Effects of Ca concentration on microstructures and properties of rolled Mg-Zn-Gd-Ca alloys

作　　者：魏成宾 闫宏[2] 杜兴蒿[1] 罗骏[2] 陈荣石[2] 

机构地区：[1]沈阳航空航天大学材料科学与工程学院,沈阳110136 [2]中国科学院金属研究所材料环境腐蚀研究中心,沈阳110016

出　　处：《中国有色金属学报》2016年第9期1858-1868,共11页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51601193;51301173;51531002);国家重点基础研究发展计划资助项目(2013CB632202)~~

摘　　要：研究Ca含量(0.1%,0.5%(质量分数))对Mg-1.5Zn-0.3Gd-Ca合金铸态组织、轧制板材组织、织构与力学性能的影响,以期通过改善合金组织和织构发展高塑性镁合金板材。结果表明:Mg-1.5Zn-0.3Gd-0.1Ca铸态合金含有细小均匀的第二相,Mg-1.5Zn-0.3Gd-0.5Ca合金中则存在大块状第二相;二者的轧制板材均呈现非基面织构;轧制板材经过退火处理后发生完全再结晶,板材的塑性可大幅度提高,Mg-1.5Zn-0.3Gd-0.1Ca合金经300℃退火后,沿横向和轧制方向的伸长率分别可达34.9%和34.1%,且轧制板材沿横向和轧向屈服强度的差异性减小。The effects of Ca content（0.1%, 0.5%（mass fraction）） on the microstructure, texture and mechanical properties of rolled Mg-1.5Zn-0.3Gd-Ca sheets were investigated aiming to develop high ductile Mg base alloys by improving the microstructure and texture. The results show that the as-cast microstructure of the Mg-1.5Zn-0.3Gd-0.1Ca alloy includes uniform and fine second phase, while in the as-cast microstructure of the Mg-1.5Zn-0.3Gd-0.5Ca alloy, the big-block second phases can be observed. The rolled sheets show non-basal texture with double peaks. The sheets show equiaxed grain after annealing treatment, and the ductility of the sheets can be improved significantly. After being annealed at 300 ℃ for 90 min, the room-temperature elongations of the Mg-1.5Zn-0.3Gd-0.1Ca alloy along the transverse direction and the rolling direction are 34.9% and 34.1%, respectively. And the difference of the yield tensile strength between the rolling and transverse direction is shown to be lower due to the static recrystallization during annealing treatment at certain temperature.

关 键 词：镁合金 轧制板材 织构 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]