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

Yasuo Ochi; Kiyotaka Masaki; Toru Hirasawa; Xiaorui Wu; Takashi Matsumura; Yorinobu Takigawa; Kenji Higashi

doi:10.2320/matertrans.47.989

Yasuo Ochi, Kiyotaka Masaki, Toru Hirasawa, Xiaorui Wu, Takashi Matsumura, Yorinobu Takigawa, Kenji Higashi

Author information

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

Keywords: magnesium alloy, high cycle fatigue, crack initiation, crack propagation, microstructure, fatigue life evaluation

JOURNAL FREE ACCESS

2006 Volume 47 Issue 4 Pages 989-994

DOI https://doi.org/10.2320/matertrans.47.989

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Abstract

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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