Abstract
A duplex process was designed to modify the surface of LY12CZ aluminum alloy by using surface mechanical attrition treatment (SMAT) prior to microarc oxidation (MAO). A surface nanocrystalline (SNC) layer was formed on the alloy surface by SMAT, a ceramic outer layer grew on the SNC layer by MAO, and finally an SNC-MAO composite coating was fabricated. The tribological behaviors of the MAO coating and SNC-MAO composite coating were comparatively evaluated. Experimental results showed that the SNC-MAO composite coating had a better wear resistance than the MAO coating in the same test condition due to a higher hardness of the ceramic coating. The wear mechanism of the MAO coating and SNC-MAO composite coating involved materials transfer from the steel ball to the coating and oxidation wear.
| Original language | English |
|---|---|
| Pages (from-to) | 1350-1357 |
| Number of pages | 8 |
| Journal | Gongcheng Kexue Xuebao/Chinese Journal of Engineering |
| Volume | 37 |
| Issue number | 10 |
| DOIs | |
| State | Published - 1 Oct 2015 |
Keywords
- Aluminum alloys
- Composite coatings
- Microarc oxidation
- Nanocrystallization
- Surface mechanical attrition treatment
- Tribology
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