Effect of microarc discharge surface treatment on the tensile properties of Al-Cu-Mg alloy

摘要

A thick ceramic coating was prepared on Al-Cu-Mg alloy by microarc discharge in aqueous solution. The tensile properties of the alloy before and after microarc oxidation (MAO) surface treatment were tested, then the fractography and morphology of ceramic oxide coatings were investigated using scanning electron microscope (SEM). It is showed that the tensile properties of aluminum alloy have smaller change after the alloy has undergone microarc discharge treatment. For all specimens with different thickness coatings, the decreases of yield strength, tensile strength and elastic modulus are less than 5%, and the contraction of area rises while the elongation slightly decreases A fter the coatings are polished, the tensile properties of the alloy are improved rather small. The surface of tensile speciimens uniformly remains a large quantity of tiny fragments of alumina coatings. That implies that the ceramic coating has good adhesion with aluminum alloy substrate.