Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 491, Issue 1-2, Pages 131-136Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.02.003
Keywords
magnesium alloy; ultrasonic fatigue; crack initiation; deformation twins; very high cycle fatigue; cyclic deformation irreversibility
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Ultrasonic fatigue testing as well as conventional fatigue testing has been conducted on commercial extruded AZ31 magnesium alloy. The S-N curve for this alloy appears to have a continuous decreasing trend in the very high cycle regime. Fatigue strength at 109 cycles is 88.7 +/- 4.1 MPa. The ratio of endurance limit at one billion cycles to the tensile strength (sigma(-1)/sigma(b)) is 0.301. Fatigue failure mainly originated from the specimen surface or near surface, where deformation twins were found after cyclic loading. Fatigue cracks were observed along twin bands. Based on cyclic deformation irreversibility caused by twinning, fatigue damage mechanisms are proposed in terms of surface/near surface crack initiation. (C) 2008 Elsevier B.V. All rights reserved.
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