Microstructure Evolution of Zn-Al Cladding Fabricated on AZ31 Magnesium Alloy

Abstract:

The surface of AZ31 magnesium substrate is coated by Zn-Al alloys using cast-penetrated cladding. The transverse section of alloy cladding is composed of cladding zone, diffusional zone, and bonding zone. The microstructure evolution, phase constitution, and chemical composition of the transition layer are studied. The experimental results exhibit cladding zone contained dendrite matrix and interdendritic eutectic structures. The plume eutectic structure and columnar eutectic structure are formed in diffusional zone and bonding zone, respectively. Zn and Al solid solutions gradually decrease and disappear owing to the diffusion of magnesium atom and the changes of magnesium element concentration. Mg₇Zn₃ phases are generated rapidly due to the interdiffusion of zinc and magnesium atoms rapidly in the diffusional zone and bonding zone. As Mg-Zn eutectic phases hinder the movement of Mg and Al atoms, the Mg-Al intermetallic compounds are eliminated completely. The microstructure is transformed into Mg solid solution and Mg₇Zn₃ eutectic structure to combine with AZ31 base metal.

• Periodical: Advanced Materials Research (Volumes 1004-1005)
• Pages: 154-157
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1004-1005.154
• Online since: August 2014
• Authors: An Sun*, Xiao Ming Sui, Hai Tao Li, Qiang Wang
• Keywords: Cast-Penetrated Cladding, Eutectic Structure, Magnesium Alloy, Microstructure Evolution

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