(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)
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。
关键字: 镁合金；轧制板材；织构；力学性能
（1.School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang110136, China;
2. Environmental Corrosion Centre, Institute of Metal Research, Chinese Academy of Sciences, Shenyang110016, China）
Abstract: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.
Key words: magnesium alloy; rolling sheet; texture; mechanical property
