Effects of plasma microarc oxidation on mechanical properties of aluminum alloys
(1.Center For Composite Materials Harbin Institute of Technology Harbin 150080 China2.Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China)
Abstract: The mechanical properties of aluminum alloy treated by plasma microarc oxidation (PMAO) were researched. The tensile tests were carried out at room temperature, 100, 200 and 300℃, respectively. Then the fractographs of tensile specimens and surface morphology of ceramic coating were studied by using SEM, at the same time, the nano-hardness and elastic modulus of the ceramic coating were determined using Nano Indenter XP system. The results show that the surface hardness of aluminum alloy increases greatly and the fracture strength of aluminum alloy coated by ceramic coating is not reduced at high temperature.
Key words: aluminum alloys； microarc oxidation； ceramic coating； mechanical properties； nano hardness