Journal
SURFACE & COATINGS TECHNOLOGY
Volume 331, Issue -, Pages 116-128Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2017.10.060
Keywords
Cold gas dynamic spray; AA7075 coating; AZ31B substrate; Friction-stir processing; Microstructure
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In this study, the cold gas dynamic spraying (CGDS) process was employed to modify the surface of AZ31B magnesium alloy with an aluminum-zinc alloy (AA7075). Friction-stir processing (FSP) was subsequently applied as a solid-state localized surface modification technique to improve the structure and integrity of the cold sprayed layer, by enhancing densification, homogeneity, and microstructural features of the as-deposited material. The structure of precipitates and grains were also refined due to the applied severe plastic deformation during FSP, which ultimately affects the indentation hardness resistance of the processed AZ31B-AA7075 bimetallic structure. Microscopy indicated slight grain coarsening within the AZ31B substrate occurred simultaneously with refinement of the AA7075 coating, along with significant hardness improvements of similar to 80% and 30% respectively for each region in terms of Vickers hardness after FSP.
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