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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

Very high cycle fatigue behaviour of as-extruded AZ31, AZ80, and ZK60 magnesium alloys

František Nový, Miloš Janeček, Viktor Škorík, Julia Müller and Lothar Wagner

Abstract

The very high cycle fatigue properties of extruded AZ31, AZ80, and ZK60 magnesium alloys were investigated. Fatigue tests were performed at ultrasonic cyclic frequency and at a load ratio of R = – 1 at ambient temperature using smooth electropolished specimens. Fatigue failures were observed at lifetimes above 109 cycles. The fatigue life was found to increase with decreasing stress amplitude. The fracture surfaces and fracture profiles of selected specimens cycled until failure were examined. The purpose of the study was to determine the role of the microstructure on the fatigue crack nucleation and growth. Furthermore, the fatigue properties were discussed on the basis of microstructure and the presence of inclusions which are known as crack initiation sites. In AZ31 and AZ80 alloys only surface-induced fatigue cracks were observed. On the other hand, in the ZK60 alloy both surface- and interior-induced fatigue cracks were observed. Both mechanisms operate in the ZK60 also at a lifetime of around 1010 cycles. Interior-induced fatigue cracks were accompanied by clear fish-eye marks on the fracture surfaces of the ZK60 alloy.


* Correspondence address, Dr. František Nový University of Žilina, Faculty of Mechanical Engineering Department of Materials Engineering Univerzitná 1, 01026 Žilina, Slovak Republic Tel.: +421 41 513 2614 Fax: +421 41 565 2940 E-mail:

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Received: 2008-8-28
Accepted: 2008-12-21
Published Online: 2013-06-11
Published in Print: 2009-03-01

© 2009, Carl Hanser Verlag, München