研究了回归及回归再时效处理对高Zn含量(质量分数为11.64%)的喷射沉积 Al-Zn-Mg-Cu铝合金的显微组织及力学性能的影响. 通过透射电子 显微镜(TEM)观察了回归及再时效合金的显微组织, 并对合金进行了力 学性能测试. 结果表明, 随回归温度的升高及时间的延长, 其回归强度 曲线呈现下降趋势, 再时效强度曲线为抛物线走势; 采用峰时效 (120 ℃, 24 h) + 回归处理 (180 ℃, 30 min) + 再时效 (120 ℃, 24 h)的处理制度, 不仅能 够获得优于峰时效的抗拉强度, 而且细化晶内组织, 是一种理想的回归再时效处理制度.
The microstructure and mechanical properties of retrogression and retrogression reaging (RRA) treated Al-Zn-Mg-Cu aluminum alloys with 11.64%Zn (mass fraction) prepared by spray deposited technology were studied using transmission electron microscopy (TEM) and MTS-810 materials test system. The results showed that with the increase of retrogression temperature and retrogression time, the ultimate tension strength (UTS) of the alloy were declined and that of RRA treated alloy exhibited a parabola feature. The UTS of the alloy treated under 120 ℃, 24 h + 180 ℃, 30 min + 120 ℃, 24 h is superior to that of peak aging alloy, which is an ideal RRA treatment system for spray deposited Al-Zn-Mg-Cu alloys.
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