(1. 沈陽航空航天大學(xué) 材料科學(xué)與工程學(xué)院，沈陽 110136；
2. 中國科學(xué)院 金屬研究所材料環(huán)境腐蝕研究中心，沈陽 110016)
摘 要: 研究Ca含量(0.1%，0.5%(質(zhì)量分?jǐn)?shù)))對Mg-1.5Zn-0.3Gd-Ca合金鑄態(tài)組織、軋制板材組織、織構(gòu)與力學(xué)性能的影響，以期通過改善合金組織和織構(gòu)發(fā)展高塑性鎂合金板材。結(jié)果表明：Mg-1.5Zn-0.3Gd-0.1Ca鑄態(tài)合金含有細(xì)小均勻的第二相，Mg-1.5Zn-0.3Gd-0.5Ca合金中則存在大塊狀第二相；二者的軋制板材均呈現(xiàn)非基面織構(gòu)；軋制板材經(jīng)過退火處理后發(fā)生完全再結(jié)晶，板材的塑性可大幅度提高，Mg-1.5Zn-0.3Gd-0.1Ca合金經(jīng)300 ℃退火后，沿橫向和軋制方向的伸長率分別可達(dá)34.9%和34.1%，且軋制板材沿橫向和軋向屈服強(qiáng)度的差異性減小。
關(guān)鍵字: 鎂合金；軋制板材；織構(gòu)；力學(xué)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
