Friction-wear behaviours of micro-arc oxidation films in situ grown on 7475 aluminium alloys. (15th October 2017)

• Record Type: Journal Article
• Authors: Dejun, K.; Jing, Z.; Hao, L.
• Is Part Of: Materials technology. Volume 32:Number 12(2017)
• Page Start: 737
• Page End: 743
• Publication Date: 2017-10-15
• Subjects: 7475 aluminium alloy -- micro-arc oxidation (MAO) film -- COF (coefficient of friction) -- worn morphology; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Technological innovations -- Periodicals; 620.1105
• DOI: 10.1080/10667857.2017.1350918
• Languages: English
• ISSNs: 1066-7857

Abstract

Abstract: An oxide film was prepared on 7475 aluminium alloy using a micro-arc oxidation( MAO). The surface–interface morphologies, chemical compositions and phases of the obtained MAO films were analysed using a field emission scanning electron microscope, energy dispersive spectrometer and X-ray diffractometer, respectively, and the friction-wear properties of the MAO film under the different loads and wear speeds were investigated using a wear test. The results show that there are a large number of convexes and concave features on the MAO film, which are primarily composed of Al and O, and the phases of MAO film are composed of α -Al2 O3 and γ -Al2 O3 . The MAO film is in situ produced on the 7475 aluminium alloy, forming a metallurgical bonding with the substrate. The average coefficients of friction (COFs) and wear depths before and after MAO decreased by 40, and 26·5%, respectively. The COFs of MAO films decrease with the wear loads and speeds, while the wear volumes increase with the wear loads and speeds. The oxides in the MAO film play a role of reducing friction and decreasing wear, the wear mechanism is primarily composed of abrasive wear.