Study on the Tribological Properties of AZ80A, ZK60A and ME20M Magnesium Alloys Under Dry-sliding Condition
CUI Gongjun1,2,3, SHI Ruibo1,2,3, LI Sai1,2,3, LIU Huiqiang1,2,3, KOU Ziming1,2,3
1 College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2 National-local Joint Laboratory of Mining Fluid Control Engineering, Taiyuan 030024, China 3 Shanxi Research Center of Mining Fluid Control Engineering, Taiyuan 030024, China
Abstract: Magnesium alloys were widely used in the aerospace, automotive and military fields, and the reliability and service life of moving parts of magnesium alloys depended on their tribological properties. In this paper, the tribological behavior of AZ80A, ZK60A and ME20M magne-sium alloys was tested by using a reciprocating ball-on-disk tribometer sliding against GCr15 steel ball under dry-sliding condition at different applied loads and sliding speeds. The wear mechanisms of magnesium alloys were analyzed by the scanning electron microscope and energy spectrometer at different loads and speeds. The results showed that the friction coefficients of alloys gradually decreased with the increase of sliding speed when the sliding speed exceeded 0.10 m/s. However, the wear rates decreased, and then increased. It was ascribed to the low shear force and formation of oxides on the worn surfaces due to the friction heat. When the sliding speed reached up to 0.20 m/s, the metal oxides peeled off from the surface in order to increase the wear rates of alloys because of the elevated temperature. The friction coefficients and wear rates of alloys increased as the applied loads increased. The wear mechanisms of magnesium alloys transferred from the abrasive wear and plastic deformation to the abrasive wear, oxidative wear, adhesive wear and plastic deformation under dry-sliding condition. The AZ80A alloy showed the good tribological properties as compared with ZK60A and ME20M alloys. It was ascribed to the high hardness, β-Mg17Al12 hard phase and metal oxides on the contacting surfaces.
崔功军, 师睿博, 李赛, 刘慧强, 寇子明. AZ80A、ZK60A和ME20M镁合金干摩擦学性能研究[J]. 材料导报, 2021, 35(10): 10103-10108.
CUI Gongjun, SHI Ruibo, LI Sai, LIU Huiqiang, KOU Ziming. Study on the Tribological Properties of AZ80A, ZK60A and ME20M Magnesium Alloys Under Dry-sliding Condition. Materials Reports, 2021, 35(10): 10103-10108.
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2021, Vol. 35 
