Abstract
Abstract Poor corrosion resistance of Mg alloys extremely limits their industrial applications. Al/Mg clad composites using Al alloy as a protective layer are expected to be an effective approach to combine good corrosion resistance and high specific strength. In this study, novel Al clad Mg composites were developed by continuously extruding 6063 Al alloy tube and AZ31 Mg alloy rod with and without preheating of Mg alloy. The Al/Mg interfacial diffusion, microstructure, texture, and flexural properties of the continuously extruded composites were investigated experimentally. The extruded composites exhibited good metallurgical bonding between Al shell and Mg core even without preheating of Mg alloy, and their fine-grained microstructure contributes to a significant enhancement in ultimate flexural strength (UFS) to 452 MPa. Preheating of Mg alloy caused complete dynamic recrystallization (DRX) of both Al shell and Mg core and modified (0001) texture of the Mg alloy, which leads to a significant improvement in the bendability of the Al/Mg composite.
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