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The effect of 0.5mass%Ca addition on the precipitation behavior of a Mg­6.0mass%Zn­3.0mass%Al (ZA63) alloy was investigated. The as-cast ZA63 and Ca-added alloys were homogenized and solid solution treated at 673K for 12 and 1 h, respectively, followed by waterquenching. Then, both alloys were aged at 343, 373, 403 and 433K. The cast ZA63 and Ca-added alloys were mainly composed of the primary ¡-Mg and Mg32(Al,Zn)49 phases. The Al2Ca phase was detected co-existing in the Ca-added alloy. The Ca addition caused the grain refinement and improved hardness after the solid solution treatment compared with the ZA63 alloy even with the trace amount of 0.5mass% Ca. The peak hardness of the Ca-added alloy aged at each temperature was higher than that of the ZA63 alloy. The microstructures of the ZA63 and Ca-added alloys produced by peak aging at 433K consist of rod-like, blocky, plate-like and lath-like precipitates. Moreover, the precipitates in the Caadded alloy are more finely and densely distributed than those in the ZA63 alloy even though the volume fraction of precipitates in the Ca-added alloy estimated by the electrical conductivity during aging at 433K for longer than 64 h is smaller than that in the ZA63 alloy. The Cliff-Lorimer plots of the EDS results for the ¢1 phase in the Ca-added alloy aged at 433K for 1000 h were examined. It was confirmed that the ¢ 0 1 phase in the Ca-added alloy contained Ca atoms, indicating that Ca atoms inside the ¢1 phase might change the structure and/or composition of precipitates. [doi:10.2320/matertrans.L-M2012819]

Effect of Ca Addition on Precipitation Behavior of Mg&ndash;6.0 mass%Zn&ndash;3.0 mass%Al Alloy

Effect of Ca Addition on Precipitation Behavior of Mg–6.0 mass%Zn–3.0 mass%Al Alloy