期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.03.024
关键词
Magnesium alloy; Rare-earth elements; Cyclic deformation; Twinning-detwinning; Texture weakening
类别
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- AUTO21 Network of Centres of Excellence
- National Natural Science Foundation of China [51371179]
- Premier's Research Excellence Award (PREA)
- NSERC-Discovery Accelerator Supplement (DAS) Award
- Canada Foundation for Innovation (CFI)
- Ryerson Research Chair (RRC) program
The present study was aimed to evaluate the strain-controlled cyclic deformation characteristics and low cycle fatigue (LCF) life of a low (similar to 0.3 wt%) Ce-containing, ME20-H112 magnesium alloy. The alloy contained equiaxed grains with ellipsoidal particles containing Mg and Ce (Mg12Ce), and exhibited a relatively weak basal texture. Unlike the high rare earth (RE)-containing magnesium alloy, the ME20M-H112 alloy exhibited asymmetrical hysteresis loops somewhat similar to the RE-free extruded Mg alloys due to the presence of twinning-detwinning activities during cyclic deformation. While cyclic stabilization was barely achieved even at the lower strain amplitudes, cyclic softening was the predominant characteristics at most strain amplitudes. The ME20M-H112 alloy showed basically an equivalent fatigue life to that of the RE-free extruded Mg alloys, which could be described by the Coffin-Manson law and Basquin's equation. Fatigue crack was observed to initiate from the near-surface imperfections, and in contrast to the typical fatigue striations, the present alloy showed some shallow dimples along with some fractions of quasi-cleavage features in the crack propagation area. (C) 2016 Elsevier B.V. All rights reserved.
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