研究了Al-6.3Zn-2.8Mg-1.8Cu铸造铝合金的组织和室温力学性能. 研究表明,在金属型铸造条件下, Al-6.3Zn-2.8Mg-1.8Cu合金的铸态组织为近等轴晶,相组成为α(Al)基体、枝晶间α(Al)+η(MgZn2)共晶、晶内游离η相(MgZn2)、少量T相(Mg3ZnxCu3-xAl2)及少量颗粒状Al7Cu2Fe. 固溶处理后, 原铸态组织中的η(MgZn$_{2}$)相大部分溶解消失, 但形成新的沿晶界分布的S相(Al2CuMg).实验确定了固溶态Al-6.3Zn-2.8Mg-1.8Cu合金较优的单级和双级时效工艺. 与单级时效工艺相比, 采用双级时效工艺处理后, 抗拉强度由480 MPa增加至490 MPa,延伸率由0.2%增加至2.2%.
The microstructures and room temperature mechanical properties of metal–mold– casting aluminum alloy Al–6.3Zn–2.8Mg–1.8Cu were studied. It was found that the microstructure of the as–cast experimental alloy consists of near equiaxed α(Al) matrix, α(Al)+η(MgZn2) eutectic and little Al7Cu2Fe particle phase. The phase constitution of the quenched experimental alloy was changed, the η phase was dissolved into α(Al) matrix and tended to disappear, however a new phase, S(Al2CuMg), appeared, which still mainly distributed along the α(Al) grain boundary. The optimum single–aging process parameters were determined by investigating age hardening response of the experimental alloy. It was found that the double–aging process could make the tensile strength of the experimental alloy increase from 480 MPa to 490 MPa, and the elongation from 0.2% to 2.2%,comparing with the single–aging process.
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