Abstract
The crystallographic orientation relationships between intermetallic compounds and matrices were investigated in the interface of an overlapped multi-pass friction stir processed Al/Mg composite materials. During the friction stir processing, an Mg rich intermetallic compound (γ-Al12Mg17) was formed close to the bottom Mg alloy and an Al rich intermetallic compound (β-Al3Mg2) was formed close to the top Al alloy. Two new orientation relationships between the Mg matrix and the γ-Al12Mg17 were observed and analyzed. One was identified as 011¯2Mg//1¯01γ, 01¯11Mg//(101)γ, and the other one was identified as 12¯10Mg//[531]γ, (0001)Mg 1.7° form 1¯21¯γ. The stereographic projections of two new orientation relationships were calculated and discussed. Moreover, high resolution transmission electron microscopy studies of the interface between the Mg matrix and the γ-Al12Mg17 indicated that the γ-Al12Mg17 had a coherent interface with the Mg matrix. It was also observed that the β-Al3Mg2 had a cubic-to-cubic orientation relationship with the Al matrix in the Al/Mg composite material interface.
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