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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1h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%.

参考文献

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