J. Mater. Sci. Technol. ›› 2023, Vol. 149: 119-126.DOI: 10.1016/j.jmst.2022.10.087

• Research Article • Previous Articles     Next Articles

Relationship between the fatigue behavior and grain structures of an as-extruded Mg-6.2%Zn-0.6%Zr (in wt.%) alloy

B.J. Wanga,*, D.K. Xub,c,d,**, C.L. Jiangb, L.Y. Shenge, E.H. Hanb   

  1. aSchool of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China;
    bKey Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    cBinzhou Institute of Technology, Binzhou 256606, China;
    dShandong Key Laboratory of Advanced Aluminium Materials and Technology, Binzhou 256606, China;
    eShenzhen Institute, Shenzhen Key Lab Human Tissue Regenerate & Repair, Peking University, Shenzhen 518057, China
  • Received:2022-09-27 Revised:2022-10-22 Accepted:2022-10-23 Published:2023-06-20 Online:2023-01-11
  • Contact: **Key Laboratory of Nuclear Materials and Safety As- sessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China. *E-mail addresses: bjwang@alum.imr.ac.cn (B.J. Wang), dkxu@imr.ac.cn (D.K. Xu) .

Abstract: Through investigating the tension-tension fatigue behavior of an as-extruded Mg-6.2 wt.%Zn-0.6 wt.%Zr (ZK60) alloy, it revealed that the determined fatigue strength at 107 cycles was quite sensitive to the grain structure. Among them, the fine grain structure had the highest fatigue strength of 130 MPa, whereas the typical “bi-modal” grain structure had the lowest fatigue strength of 110 MPa. Failure analysis demonstrated that for the fine grain structure, fatigue cracks preferentially nucleated at grain boundaries. For the “bi-modal” and coarse grain structures, the fatigue crack initiation was dominated by the cracking along slip bands.

Key words: Mg alloys, Grain structure, Cyclic slips, Fatigue behavior, Crack initiation