High Cycle Fatigue Property and Micro Crack Propagation Behavior in Extruded AZ31 Magnesium Alloys

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  • Ochi Yasuo
    Department of Mechanical Engineering & Intelligent Systems, University of Electro- Communications, Tokyo (UEC, Tokyo)
  • Masaki Kiyotaka
    Department of Mechanical Engineering & Intelligent Systems, University of Electro- Communications, Tokyo (UEC, Tokyo)
  • Hirasawa Toru
    Department of Mechanical Engineering & Intelligent Systems, University of Electro- Communications, Tokyo (UEC, Tokyo)
  • Wu Xiaorui
    Department of Mechanical Engineering & Intelligent Systems, University of Electro- Communications, Tokyo (UEC, Tokyo)
  • Matsumura Takashi
    Department of Mechanical Engineering & Intelligent Systems, University of Electro- Communications, Tokyo (UEC, Tokyo)
  • Takigawa Yorinobu
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • Higashi Kenji
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University

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High cycle fatigue tests in rotating bending loading were carried out in extruded AZ31 magnesium alloys with two kinds of grain size (about 30 μm and about 50 μm). Effects of microstructure and grain size on fatigue behaviors such as fatigue strength, crack initiation and propagation behaviors were discussed. As the results, there were no clear difference in the fatigue strength, the crack initiation and propagation behaviors in the both alloys. There showed a clear bending point in the relation between crack propagation rate da⁄dN and the stress intensity factor range ΔK at about ΔK=3 MPa\\sqrtm. The fatigue lives in the higher stress level were evaluated from the inclusion size and the relation of da⁄dN−ΔK.

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