材料科学与技术 ›› 2019, Vol. 35 ›› Issue (3): 275-284.DOI: 10.1016/j.jmst.2018.07.003

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  • 收稿日期:2018-03-19 修回日期:2018-05-25 接受日期:2018-07-17 出版日期:2019-03-15 发布日期:2019-01-18

Self-lubricate and anisotropic wear behavior of AZ91D magnesium alloy reinforced with ternary Ti2AlC MAX phases

Wenbo Yuab*(), Deqiang Chenb, Liang Tianc, Hongbin Zhaod, Xiaojun Wange**()   

  1. aCenter of Materials Science and Engineering, School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing, 100044, China
    bNational United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang, 471023, China
    cDepartment of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109, USA
    dState Key Laboratory of Advanced Materials for Smart Sensing, General Research Institute for Nonferrous Metals, Beijing, 100088, China
    eSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China
  • Received:2018-03-19 Revised:2018-05-25 Accepted:2018-07-17 Online:2019-03-15 Published:2019-01-18
  • Contact: Yu Wenbo,Wang Xiaojun
  • About author:

    1 These authors contributed equally to this work.

Abstract:

The dry sliding wear behavior of Ti2AlC reinforced AZ91 magnesium composites was investigated at sliding velocity of 0.5 m/s under loads of 10, 20, 40 and 80 N using pin-on-disk configuration against a Cr15 steel disc. Wear rates and friction coefficients were registered during wear tests. Worn tracks and wear debris were examined by scanning electron microscopy, energy dispersive X-ray spectrometry and transmission electron microscopy in order to obtain the wear mechanisms of the studied materials. The main mechanisms were characterized as the magnesium matrix oxidation and self-lubrication of Ti2AlC MAX phase. In all conditions, the composites exhibit superior wear resistance and self-lubricated ability than the AZ91 Mg alloy. In addition, the anisotropic mechanisms in tribological properties of textured Ti2AlC-Mg composites were confirmed and discussed.

Key words: Ti2AlC, Dry sliding wear, Magnesium alloy, Self-lubricate ability