Strength Properties of Thin Alumina Coatings on 4043 Aluminum Alloy

Man Feng Gong; Sheng Ru Qiao; Cheng Yu Zhang; Hao Ji

doi:10.4028/www.scientific.net/MSF.610-613.668

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Strength Properties of Thin Alumina Coatings on 4043 Aluminum Alloy

Abstract:

Alumina (Al2O3) coatings in the thickness of 10μm and 15μm were prepared on the 4043 Al-Si alloy substrates by electroplating technology. Multiple mechanical properties of alumina coatings were evaluated by various techniques: the long distance microscope, Charge Coupled Device microphotographics, acoustic emission and strain foils. For the electroplating alumina coatings, the in-plane tensile strength is 68.1 MPa, the cohesive strength is 96.2 MPa and the adhesive strength is over 22.7 MPa. Three different directional microcracks, which are relative to the tensile directional and corresponding to two fail modes in the alumina (coatings)/4043 Al-alloy (substrate) system, were found.