High Cycle Fatigue Property of Extruded Non-Combustible Mg Alloy AMCa602

Kiyotaka Masaki; Yasuo Ochi; Toshifumi Kakiuchi; Keiichi Kurata; Toru Hirasawa; Takashi Matsumura; Yorinobu Takigawa; Kenji Higashi

doi:10.2320/matertrans.MC2007108

Kiyotaka Masaki, Yasuo Ochi, Toshifumi Kakiuchi, Keiichi Kurata, Toru Hirasawa, Takashi Matsumura, Yorinobu Takigawa, Kenji Higashi

Author information

Kiyotaka Masaki
Department of Mechanical Systems Engineering, Okinawa National College of Technology
Yasuo Ochi
Department of Mechanical Engineering & Intelligent Systems, University of Electro-Communications, Tokyo (UEC, Tokyo)
Toshifumi Kakiuchi
Department of Mechanical Engineering & Intelligent Systems, University of Electro-Communications, Tokyo (UEC, Tokyo)
Keiichi Kurata
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)
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: non-combustible magnesium alloy, high cycle fatigue, crack initiation, crack propagation behavior, inclusion, fatigue life evaluation

JOURNAL FREE ACCESS

2008 Volume 49 Issue 5 Pages 1148-1156

DOI https://doi.org/10.2320/matertrans.MC2007108

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Abstract

Rotating bending tests were performed at room temperature on the non-combustible magnesium alloy AMCa602, which was produced by adding 2% calcium (Ca) to the AM60 magnesium alloy. The fatigue strength at 10⁷ cycles was approximately 100 MPa. The fatigue property was strongly dependent on the inclusion size. In order to identify the type of the inclusion at the crack initiation site, elemental analyses were conducted by an electron probe microanalyzer (EPMA). The inclusion at the crack initiation site was AlN, which may have originated from impurities mixed in during casting. The relation between da/dN and ΔK was analyzed by the crack propagation behavior, and the fatigue life was evaluated by using the Paris law. As a result, it was clarified that most of the fatigue life was spent on crack initiation and micro crack propagation.

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