Fretting wear behavior of AZ91D magnesium alloy
(1.湖南省湘潭市湖南科技大学机械工程学院
2.School of Materials Science and Engineering, Chongqing Institute of Technology, Chongqing 400050, China)
2.School of Materials Science and Engineering, Chongqing Institute of Technology, Chongqing 400050, China)
Abstract: The fretting behaviour of the AZ91D magnesium alloy was investigated. The influence of the number of cycles, normal load (contact pressure) and the amplitude of slip on the fretting behavior of the material were focused. Fretting tests were performed under various running conditions with regard to normal load levels and slip amplitudes. The friction coefficient between the surfaces at the fretting junction was continuously recorded. The fretting damage on the magnesium specimens was studied by SEM. The results show that the wear volume increases with the increase of slip amplitude, and linearly increases with the increase of normal load in the mixed and gross slip regime, but the normal load has no obvious effect on the wear volume in the partial slip regime. The predominant fretting wear mechanism of magnesium alloy in the slip regime is the oxidation wear, delaminated wear and abrasive wear.
Key words: AZ91D magnesium alloy; fretting; friction coefficient; wear mechanism; wear behavior