Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 539, Issue -, Pages 223-229Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.01.084
Keywords
Magnesium alloy; Twinning; Fatigue
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Funding
- Internal S&T Cooperation Program of China [2011DFR50010]
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Fatigue properties and cyclic deformation behavior of an extruded Mg-3Al-1Zn (AZ31) alloy were investigated by performing the strain-controlled low-cycle fatigue tests at room temperature. We believed that the total strain amplitude should be closely related to fatigue properties and cyclic damage process. This study aimed to investigate the deformation mechanism from the viewpoint of strain amplitude. We found that when the total strain amplitude increased from 0.3% to 0.4%, there was a noticeable change in compressive peak stress amplitude, which might correspond to the competition between twinning-detwinning process and dislocation slips. Microstructure and fracture morphology were investigated using optical microscopy and scanning electron micrograph. At the total strain of great amplitude, fracture surfaces were characterized by the striation-like features and dimple-like structures. (C) 2012 Elsevier B.V. All rights reserved.
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