Abstract
Magnesium/aluminum (Mg/Al) composites were formed by cold arc cladding (CAC) of Al alloy (AlMn1 and AlMg5) on AZ61 magnesium alloy. In the CAC of Mg/Al composites, segregation on the macroscopic and microscopic scale always occurs across the interface of the cladding layer, which affects properties of the composites. Understanding segregation mechanism in the Mg/Al composites is critical for the CAC process. Therefore, in this paper, segregation and evolution of IMCs in the Mg/Al composites were carefully investigated by SEM, EDS and XRD. Three kinds of mechanism for segregation were proposed for the interlayer of overlap region, the transition zone and the cladding layer. In the interlayer of overlap region, surfing flow of the melted base metal caused a macrosegregation zone composed of Al3Mg2 and α-Al. For the transition zone, a gradient component layer consisted of Al3Mg2 sub-layer, Al12Mg17 sub-layer and Mg + Al12Mg17 sub-layer caused the macrosegregation. Inner the cladding layer, the macrosegregation composed of Al3Mg2+Al12Mg17 eutectoid structure was formed by insufficient mixing of the molten pool. Furthermore, the effect of cladding parameters on the segregation was also discussed. It is proved that lower heat input can decrease the segregations in the Mg/Al composites. The present study can provide theoretical reference and practical experience for CAC of Mg/Al composites.
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