MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Fatigue of Welded Magnesium Alloy Joints
Masato TsujikawaHidetoshi SomekawaKenji HigashiHayato IwasakiTakeshi HasegawaAkiyoshi Mizuta
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2004 Volume 45 Issue 2 Pages 419-422

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Abstract

Fatigue tests were carried out on welded joints of commercial AZ31 alloy and AZ61 alloy in air as welded surface condition. Alloys were extruded or rolled to a plate shape. Pairs of the same type of alloy plates were butt-welded by tungsten inert gas (TIG) welding or friction stir welding (FSW). All welded joints except FSW-ed AZ61 have joint efficiency of around 90% for static tensile strength. Extruded AZ31 alloy joints by TIG or FSW showed fatigue joint efficiency of about 80%. However, fatigue joint efficiencies for other joints were at around 60%. Fracture surfaces showed brittle fatigue crack propagation; moreover, the directions of crack propagation were influenced remarkably by the microstructures.

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© 2004 The Japan Institute of Metals and Materials
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