Abstract

In this research, aging behavior and precipitation sequence in an age-hardenable Mg-4Sm-1.3Zn-0.4Zr (wt%) alloy were investigated, using Differential Scanning Calorimeter (DSC) and Transmission Electron Microscopy (TEM) techniques. The precipitation sequence was determined to be Super Saturated Solid Solution (S.S.S.S) → solute atom clusters → γ″ → γ′ → γ, which changes drastically compared to those reported for Zn-free Mg-Sm-Zr alloys. Among them, γ″, with a GP zone structure, lies on {0001}α basal planes, and is the dominant precipitate responsible for age hardening effect. γ′ has a hexagonal structure, with a=0.556nm, c=0.521nm.

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