Influence of SNC-MAO Composite Coating on Tensile Properties of Aluminum Alloy
WEN Lei1, WANG Ya-ming2, JIN Ying1
1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;
2. Institute of Advanced Ceramics, Harbin Institute of Technology, Harbin 150080, China
Abstract：A duplex process was designed to modify the alloy surface using surface mechanical attrition treatment (SMAT) prior to microarc oxidation (MAO). A surface nanocrystalline (SNC) layer was formed on the surface of Al alloy by SMAT,on which a ceramic coating grew by MAO,finally the SNC-MAO composite coating are fabricated. The tensile properties of the SMATed alloy,MAO coating and SNC-MAO composite coating were comparatively evaluated. Experimental results show that the yield strength and tensile strength of the substrate Al alloy are reduced after MAO treatment,while those of SNC-MAO treated samples are improved due to the introduction of SMAT pre-treatment. When the elongation is 8%,SNC-MAO coating shows better tensile and adhesion properties compared with MAO coating with the same thickness.
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