Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7974376 | Materials Science and Engineering: A | 2018 | 9 Pages |
Abstract
This work investigated the effect of loading mode on high cycle fatigue properties in Mg-6Zn-1Mn (ZM61) alloys. Extruded, T5 treated and double-aged ZM61 alloys were used in this study. High cycle fatigue tests were carried by a servo-hydraulic fatigue testing system under zero-tension load (R = 0) and fully reversed tension-compression load (R = â1), respectively. The results showed that all the three alloys exhibited more outstanding high cycle fatigue strength under zero-tension load than under tension-compression load. By observing microstructures of post-fatigued specimens, a large number of low angle grain boundaries appeared in zero-tension load specimens, but {101Ì
2} twins were found in tension-compression load specimens. The variations of fatigue properties in zero-tension load and tension-compression load were related to deformation mechanisms under different load conditions. The fatigue deformation mechanism in Mg-6Zn-1Mn alloy under zero-tension load was mainly dislocation slip, while under tension-compression load, the activation of {101Ì
2} twinning in compression half cycles resulted in the deteriorative fatigue strength.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Daliang Yu, Dingfei Zhang, Qingwei Dai, Wei Lan, Jian Peng, Junyao Xu, Fugang Qi, Fusheng Pan,