中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 23 No. 2 February 2013 |
（Department of Metallurgical and Materials Engineering, Faculty of Chemical and Metallurgical Engineering,
Yildiz Technical University, Davutpasa Campus, 34210 Esenler, Istanbul, Turkey）
Abstract:An attempt was made to modify the surface of in-situ aluminium matrix composite (AMC) by micro-arc oxidation (MAO). In the microstructure of AMC, CuAl2 reinforcements were generated by introducing 15% CuO into the aluminium melt. AMC was hot forged, homogenised, quenched and artificially aged before the MAO in a KOH, KF and Na2SiO3-containing electrolyte. After the MAO process the surface of the AMC was covered with Al2O3 coating having an effective thickness of about 15 μm. Appearance of crack and/or delamination free zones at the periphery of the indent after the Rockwell C adhesion test indicated good adhesion between the composite and the Al2O3 coating. During dry sliding wear tests, this adherent Al2O3coating resisted the destructive action of the Al2O3 ball and provided about 15 times enhancement in wear resistance as compared to the original state.
Key words: in situ composite; aluminum matrix composite; microarc oxidation; wear; tribology
