Effect of long-period stacking ordered phase on thermal stability of refined grains in Mg-RE-based alloys |
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| Authors: | Y.X. Li D. Qiu Y.H. Rong |
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| Affiliation: | 1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P.R. China;2. School of Mechanical and Mining Engineering, University of Queensland, St Lucia, QLD 4072, Australia;3. School of Mechanical and Mining Engineering, University of Queensland, St Lucia, QLD 4072, Australia |
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| Abstract: | The refined grains in both as-cast Mg-10Y-1Zn-2Zr (WZ101?K, wt.%) and Mg-10Y-1Al (WA101, wt.%) alloys have been found to have superior thermal stability after solution treatment. Plate-shaped, but different polytypes of long-period stacking ordered (LPSO) phases distributed along grain boundaries are considered as the predominant inhibitors of grain growth. Based on the plate-shaped features of the LPSO phases, a modified Zener’s model is established and the predicted limiting grain sizes are in a good agreement with the experimental results. Therefore, this model has strong potential for designing advanced Mg-RE-based alloys with high strength and high creep resistance at high temperatures. |
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| Keywords: | magnesium alloys LPSO phase grain size thermal stability modified Zener’s model |
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