Thermodynamic analysis of processability of Mg–Al–Zn–Mn alloys for rheocasting |
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| Authors: | H -M Guo F -M Wen X -J Yang H -L Jin A -S Zhang |
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| Affiliation: | 1. School of Materials Science and Engineering, Nanchang University, 999 Xuefu Road, Nanchang 330031, China;2. Key Laboratory of Near-Net Forming in Jiangxi Province, Nanchang University, 999 Xuefu Road, Nanchang 330031, China;3. Key Laboratory of Near-Net Forming in Jiangxi Province, Nanchang University, 999 Xuefu Road, Nanchang 330031, China |
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| Abstract: | A two-stage thermodynamic calculation procedure was developed to analyse alloy compositions for rheocasting. Based on Kazakov's criteria, the processability of AZ91, AZ61 and AM60B for rheocasting was investigated. The results show that these alloys do not satisfy selected criteria fully, and only AZ91 is possible to be used for rheocasting with semisolid slurry having lower fraction solid (0.2–0.4). In microstructure produced by rheocasting, the β-Mg17Al12 phase forms continuous network along primary α-Mg gain boundary and is concentrated in this limited contiguous space. The routes to modify and optimise alloy composition were proposed. |
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| Keywords: | Magnesium alloys Rheocasting Thermodynamic calculation |
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