Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 3, Pages 417-423Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.08.044
Keywords
AZ31 magnesium alloy; Low-cycle fatigue; Anisotropy; Twinning; Mean stress
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Funding
- POSCO (Pohang Steel Company)
- RIST (Research Institute of Industrial Science and Technology), Korea
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Low-cycle fatigue (LCF) tests were carried out to investigate the effect of anisotropy on the fatigue resistance of rolled AZ31 magnesium (Mg) alloy. The alloy showed a strong basal texture indicating that most of the basal planes of hexagonal close-packed lattice were located parallel to the rolling direction. Specimens loaded parallel to the rolling direction (RD) were easy to yield in compression, while those loaded normal to the rolled plane (ND) were easily yielded in tension by twinning. This anisotropy caused superior fatigue resistance of ND specimen by introducing the beneficial compressive mean stress. An energy-based model considering the effect of the mean stress was used for the prediction of fatigue life and the predicted results showed a good agreement with experimental data. (C) 2009 Elsevier B.V. All rights reserved.
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