Abstract
The effect of long-period stacking ordered (LPSO) phases on the dynamic recrystallization (DRX) of the compressed Mg-6.9Gd-3.2Y-1.5Zn-0.5Zr (wt pct) alloy was investigated. LPSO phases of various morphologies were obtained by homogenization at 783 K (510 °C) for various durations. During homogenization, intragranular thin-platelet LPSO phases form near the α-Mg grain boundaries first, then penetrate through the grain interior, and finally coagulate. During compression at 753 K (480 °C), intragranular thin-platelet LPSO phases reduce the DRX ratio by hindering the migration of α-Mg grain boundaries. Intragranular-coagulated LPSO phases stimulate DRX near the α-Mg grain boundaries, while faintly affecting the DRX behavior in the interior of α-Mg grains. However, interdendritic phases enhance the nucleation of DRX-ed grains via the particle-stimulated nucleation mechanism. Among all the compressed alloys, the alloy rich in thin-platelet LPSO phases exhibits the optimal mechanical properties.
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Acknowledgments
This work was supported by the National Basic Research Program of China [Grant Number 2013CB632200] and the Natural Science Foundation of China [Grant Number 51574291]. The authors would like to thank Professor Sai-yi Li and Dao-yun Ding (Central South University) for their comments on the paper.
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Manuscript submitted December 29, 2016.
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Zhou, Xj., Liu, Cm., Gao, Yh. et al. Evolution of LPSO Phases and Their Effect on Dynamic Recrystallization in a Mg-Gd-Y-Zn-Zr Alloy. Metall Mater Trans A 48, 3060–3072 (2017). https://doi.org/10.1007/s11661-017-4081-2
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DOI: https://doi.org/10.1007/s11661-017-4081-2