Abstract
ABSTRACT In this study, the ZrCp/Al-Mg composite fillers, successfully prepared using semi-solid stir casting, ultrasonic vibration and multi-pass rolling processes, were joined with 7075-T651 plates via tungsten insert gas (TIG) welding. The metallographic structure, tensile strength, microhardness and corrosion resistance were investigated. The results indicated that the introduction of ZrC particles favoured the continuous heterogeneous nucleation and inhibit the formation of coarse precipitates in the composite materials. The uniform distribution of ZrC particles could refine α-Al grains. As a result, the mechanical properties and corrosion resistance of weld joints were improved compared to those with 5183 fillers. Study turned out the optimal amount of ZrC particles was 2 wt.%, improving significantly on grain size, tensile strength, corrosion resistance and microhardness.
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