Fatigue Behaviour of Mg2Si-Particulate Reinforced Magnesium Alloy Composites

This paper describes the fatigue behaviour of MgzSi-particulate reinforced magnesium alloy composites. Rotating bending fatigue tests have been performed using smooth specimens of two materials, Mg2Si/AZ 31-H and Mg2Si/AZ 31-L, extruded at high and low billet temperatures, respectively. Fatigue stre...

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Bibliographic Details
Published inNihon Kikai Gakkai ronbunshū. A Vol. 19; no. 2; pp. 252 - 257
Main Authors Uematsu, Yoshihiko, Tokaji, Keiro, Manabe, Takao, Kamakura, Mitsutoshi
Format Journal Article
LanguageJapanese
Published 01.02.2007
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Summary:This paper describes the fatigue behaviour of MgzSi-particulate reinforced magnesium alloy composites. Rotating bending fatigue tests have been performed using smooth specimens of two materials, Mg2Si/AZ 31-H and Mg2Si/AZ 31-L, extruded at high and low billet temperatures, respectively. Fatigue strength was evaluated and compared with a conventional extruded AZ 31 alloy, and fracture mechanisms were discussed. Fatigue strength was strongly affected by billet temperature during the extrusion process, where Mg2Si/AZ 31-L exhibited significantly higher fatigue strength than Mg2Si/AZ 23-H. When compared with the extruded AZ 31 alloy, Mg2Si/AZ 31-L also showed slightly higher fatigue strength. In Mg2Si/AZ 31-L, fatigue cracks initiated in the matrix microstructure near particles, while in Mg2Si/AZ 31-H, generated at the interface between the matrix and particles, and subsequent small cracks grew faster in Mg2Si/AZ 31-H than in Mg2Si/AZ 31-L, which were responsible for the observed billet temperature dependence of fatigue strength.
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ISSN:0387-5008