Low-cycle Fatigue Behaviors of an As-extruded Mg-12%Gd-3%Y-0.5%Zr Alloy

doi:10.1016/j.jmst.2013.04.011

J. Mater. Sci. Technol. ›› 2013, Vol. 29 ›› Issue (8): 775-780.DOI: 10.1016/j.jmst.2013.04.011

Low-cycle Fatigue Behaviors of an As-extruded Mg-12%Gd-3%Y-0.5%Zr Alloy

S.M. Yin^1)*, S.X. Li²⁾

1) Shenyang University of Chemical Technology, Shenyang 110142, China
2) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2012-04-11 Revised:2012-07-02 Online:2013-08-30 Published:2013-07-17
Contact: S.M. Yin
Supported by:
National Natural Science Foundation of China under Grant No. 50571102. The authors are grateful to W. Gao and H.J. Yang for assistance with the EBSD measurement.

Abstract

Abstract:

Cyclic deformation and fatigue behaviors of Mg–12%Gd–3%Y–0.5%Zr (wt%, GW123K) alloy were investigated at room temperature under axial cyclic loading in strain controlled condition. It is shown that conventional extruded GW123K alloy maintained cyclic stability at strain amplitudes ranging from 2 × 10⁻³ to 10⁻². The pronounced symmetric hysteresis loops were also observed during cyclic loading. Fracture surface observations indicated that fatigue cracks mainly initiated at large Gd-riched phase or at inclusion clusters at surface or subsurface, and grain boundary (GB) and slip bands (SBs) are also preferential sites for micro-crack incubation.

Key words: Magnesium alloy, Low-cycle fatigue, Cyclic stabilization, Fatigue crack, Fractography

S.M. Yin, S.X. Li. Low-cycle Fatigue Behaviors of an As-extruded Mg-12%Gd-3%Y-0.5%Zr Alloy[J]. J. Mater. Sci. Technol., 2013, 29(8): 775-780.

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Low-cycle Fatigue Behaviors of an As-extruded Mg-12%Gd-3%Y-0.5%Zr Alloy

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