(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 武汉职业技术学院 轻工学院，武汉 430074)
摘 要: 采用活性熔剂保护熔炼、水冷铜模激冷铸造制备Al-5.8Mg-0.4Mn和Al-5.8Mg-0.4Mn- 0.25Sc-0.1Zr(质量分数，%)两种合金铸锭。合金铸锭经热轧−中间退火−冷轧成2 mm薄板；研究稳定化退火及微量Sc和Zr对Al-Mg-Mn合金组织与性能的影响。结果表明：在Al-Mg-Mn合金中加入微量Sc和Zr后形成大量弥散的 Al3(Sc, Zr)粒子，这些粒子对位错和亚晶界具有强烈的钉扎作用，能明显提高合金的抗再结晶能力和室温力学性能；Al-Mg-Mn-Sc-Zr合金板材经300 ℃退火1 h后可获得最佳综合力学性能，其σb、σ0.2 与δ分别为436 MPa、327 MPa和16.7%。
关键字: Al-Mg-Mn-Sc-Zr合金；稳定化退火；再结晶；Al3(Sc, Zr)粒子；显微组织
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Institude of Light Industry, Wuhan Polytechnic College, Wuhan 430074, China）
Abstract:Both Al-5.8Mg-0.4Mn and Al-5.8Mg-0.4Mn-0.25Sc-0.1Zr (mass fraction, %) alloy ingots were prepared using water chilling copper mould ingot metallurgy processing protected by active flux. The alloy ingots were finally rolled into 2 mm-thick sheets after hot rolling-intermediate annealing-cold rolling. The effects of stabilizing annealing and minor Sc, Zr on the microstructure and mechanical properties of Al-Mg-Mn alloys were studied. The results show that after adding minor Sc and Zr into Al-Mg-Mn alloy simultaneously a large number of Al3(Sc, Zr) particles dispersedly distribute in the matrix, which have function of strongly pinning sub-grain boundaries and dislocations. The anti-recrystallization ability and the mechanical properties of the Al-Mg-Mn-Sc-Zr alloy sheet are significantly improved. By annealing at 300 ℃ for 1 h, the Al-Mg-Mn-Sc-Zr alloy sheet can obtain the optimum application values of σb, σ0.2 and δ, which are 436 MPa, 327 MPa and 16.7%, respectively.
Key words: Al-Mg-Mn-Sc-Zr alloys; stabilizing annealing; recrystallization; Al3(Sc, Zr) particles; microstructure
