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.
| Original language | English |
|---|---|
| Pages (from-to) | 15-20 |
| Number of pages | 6 |
| Journal | Journal of Materials Engineering |
| Volume | 44 |
| Issue number | 3 |
| DOIs | |
| State | Published - 20 Mar 2016 |
Keywords
- Aluminum alloy
- Microarc oxidation
- Surface mechanical attrition treatment
- Surface nanocrystallization
- Tensile property
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