Sliding wear map for the magnesium alloy Mg-9Al-0.9 Zn (AZ91)

摘要: Abstract Dry sliding wear tests were performed on a Mg-9.0%, Al-0.9%, Zn (AZ91) alloy using block on-ring (AISI 52100 steel) configuration. Wear rates measured within load range of 1–350 N and velocity 0.1–2.0 m/s Compositions, morphologies microstructures worn surfaces debris characterised by scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS) diffractometer (XRD). A mapping approach, consisting identification micromechanisms leading to the generation loose surface damage determination applicability each mechanism as function speed, has been adopted. Two main regimes, namely mild regime severe have observed. The role contact temperature transition was investigated in detail. It shown that from controlled onset coincided with 347 K. In two different operated, i.e. sub-wear an oxidational delamination regime, identified. Similarly, mechanisms responsible for formation. These classified plastic deformation induced melt regimes. results metallographic investigations summarised map. An empirical model, which serves predict critical at wear, developed.