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研究固溶和时效处理对Mg-8Zn-4A l-0.25Mn合金组织和性能的影响。结果表明,试验合金经345℃固溶12 h水冷后,合金组织中的Mg32(A l,Zn)49和A l2Mg5Zn2相三元化合物数量急剧减小,并且原有连续网状Mg32(A l,Zn)49相变为断续网状,颗粒状Mg32(A l,Zn)49相和小块状A l2Mg5Zn2相变得更加圆整和细小。同时,合金的显微硬度随固溶时间增加而逐渐降低。经180℃时效处理后,析出大量弥散分布的细小Mg-Zn-A l三元颗粒状析出物,并且随着时效时间延长,合金的显微硬度逐渐增加,在12 h时达到最大值。
The effects of solution treatment and aging treatment on microstructure and properties of Mg-8Zn-4A l-0.25Mn alloy were studied. The results show that the amount of ternary Mg32 (Al, Zn) 49 and Al2Mg5Zn2 phases in the alloy decreases sharply after water cooling at 345 ℃ for 12 h, and the original continuous network Mg32 (Al, Zn 49 phases become discontinuous reticulate, the granular Mg32 (Al, Zn) 49 phase and the small lump Al2Mg5Zn2 phase become more rounded and finer. At the same time, the microhardness of the alloy decreases with the increase of solution time. After aging at 180 ℃, a large amount of fine Mg-Zn-Al ternary precipitates were precipitated. With the aging time increasing, the microhardness of the alloy gradually increased and reached the maximum at 12 h.