期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.03.041
关键词
Magnesium alloy; Cyclic deformation; Low cycle fatigue; Twinning-detwinning; Texture; Tension-compression yield asymmetry
类别
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- AUTO21 Network of Centres of Excellence
- Ministry of Science and Technology of China (MOST)
- Natural Science Foundation of China (NSFC) [20118AE22B02, 2011DFA50907, 51171113]
- Premier's Research Excellence Award (PREA)
- NSERC-Discovery Accelerator Supplement (DAS) Award
- Canada Foundation for Innovation (CFI)
- Ryerson Research Chair (RRC) program
The application of ultra-lightweight magnesium alloys inevitably involves fatigue resistance under cyclic loading. The present study was aimed at evaluating strain-controlled cyclic deformation behavior and the relevant effect of microstructure in a rare-earth (RE) element containing extruded Mg-10Gd-3Y-0.5Zr (GW103K) alloy. The microstructure of this alloy consisted of fine equiaxed grains with an average grain size of about 12 pm and a large number of RE-containing precipitates. Unlike the RE-free extruded magnesium alloys, this alloy exhibited essentially cyclic stabilization and symmetrical hysteresis loops without tension-compression asymmetry due to the presence of the relatively weaker texture and the suppression of twinning activities arising from the fine grain size and especially RE-containing precipitates. A detailed analysis for understanding the obstructive role of the precipitate to twinning has been presented. While this alloy had a lower cyclic strain hardening exponent than the RE-free extruded magnesium alloys, it had a longer fatigue life which can also be described by the Coffin-Manson law and Basquin's equation. Fatigue crack was observed to initiate from the specimen surface with some cleavage-like facets at the initiation site. Crack propagation was basically characterized by fatigue striations in conjunction with secondary cracks. (C) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据