Abstract

An in situ observation of the precipitation of γ-Mg17Al12 phase in a die-cast Mg–Al–Zn–Sn alloy was performed using a transmission electron microscope equipped with a heating stage maintained at 403 K for 100 min. The addition of a small amount of Sn to the AZ91 system accelerates the development of the γ-Mg17Al12 phase formed during continuous precipitation. A new orientation relationship between the γ-Mg17Al12 precipitate and α-Mg matrix was identified as .

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