Abstract
Cyclic deformation and low-cycle fatigue behavior of Mg–10Gd–3Y–0.5Zr alloy in sand-cast and aging treatment conditions (sand-cast-T6) were investigated by carrying out full reversed strain-controlled tension-compression tests at the strain amplitude ranging from 0.25 to 0.7%. The results show that stress–strain hysteresis loops of the studied alloys display near tension-compression symmetry, which is dominated by microstructure and strain amplitude. Both sand-cast and sand-cast-T6 alloys exhibit cyclic hardening and softening phenomenon with increasing loading cycles. Meanwhile, the fatigue life of the aged alloy is higher than that of the sand-cast alloy at all applied strain amplitudes. The theoretical strain fatigue limits (ε0) of sand-cast and sand-cast-T6 alloys are 2.1% and 2.3%, respectively. In addition, the low-cycle fatigue behavior of the studied alloy at different strain amplitudes was also investigated.
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ACKNOWLEDGMENTS
This work is supported by National Key Research and Development Program of China (No. 2016YFB0701205), Science Innovation Foundation of Shanghai Academy of Spaceflight Technology (Nos. SAST2015047 and SAST2016048), and Research Program of Joint Research Center of Advanced Spaceflight Technologies (No. USCAST2015-25).
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Wang, Q., Liu, W., Wu, G. et al. Influence of heat treatment on cyclic deformation and low-cycle fatigue behavior of sand-cast Mg–10Gd–3Y–0.5Zr magnesium alloy. Journal of Materials Research 32, 2179–2187 (2017). https://doi.org/10.1557/jmr.2017.196
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DOI: https://doi.org/10.1557/jmr.2017.196