Abstract
The friction and wear properties of AZ31B magnesium alloy fabricated by a new severe plastic deformation called extrusion-shear (shorted for ES) have been investigated in dry sliding condition. Dry sliding tests for AZ31B magnesium alloy processed by direct extrusion have been performed and compared with that of the alloy prepared by ES process. The results show that the wear resistance of AZ31B alloy was improved by Extrusion-Shear process, compared with direct extrusion. This was mainly attributed to the grain size refinement in Extrusion-Shear process. The main wear mechanisms of both alloys are abrasion slight deformation, oxidation delamination and melting under different frequencies. The effective stresses for the surface region during wear process have been calculated by using FE (Finite Element) method. The simulation results indicates that a higher effective stress is accumulated in the direct extrusion alloy than in the ES alloy, which may cause a larger volumetric wear rate of AZ31B magnesium alloy.
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