采用铸锭冶金法制备了Al-8.0Zn-2.0Mg-1.2Cu-0.15Zr-xSc合金,对合金进行了固溶、时效处理,测试了不同状态下合金的力学性能和电导率,利用光学显微镜、扫描电镜和透射电子显微镜研究了合金不同状态的显微组织.结果表明:添加微量钪形成的一次Al,(Sc,Zr)相可作为异质形核核心,细化合金铸态组织;均匀化退火过程中析出的二次Al,(Sc,Zr)粒子强烈钉扎位错和亚晶界,有效阻碍固溶处理过程中合金的再结晶;含0.30%Sc的Al-Zn-Mg-Cu-Zr合金的抗拉强度和伸长率显著高于不加钪的铝合金,经一般固溶及回归再时效(RRA)处理后含0.30%Sc合金的抗拉强度提高36 MPa、屈服强度提高30 MPa、伸长率提高3.0%;采用470℃X60 min+485℃×60 min强化固溶处理,降低合金固溶态的电导率,将合金固溶态以及T6态的抗拉强度分别提高了79.6 MPa、55.8 MPa.
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