Investigation of the non-equilibrium solidification microstructure of a Mg–4Al–2RE (AE42) alloy

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• 作者：Weihua Sun ; Xiaoying Shi ; Emre Cinkilic ; Alan A. Luo
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：51
• 期：13
• 页码：6287-6294
• 全文大小：1,721 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803
• 卷排序：51

文摘

The solidification microstructures of AE42 (Mg–4Al–2RE, wt%) alloys with three different cooling rates are investigated using CALculation of PHase Diagrams (CALPHAD) simulation and experimental validation. The results show that high cooling rates can refine the microstructure and decrease the formation of particulate Al₂RE intermetallics. Particularly, the Mg₁₇Al₁₂ phase, predicted by CALPHAD simulation using the Scheil model, is not observed in the high-pressure die casting (HPDC) sample. The suppression of Mg₁₇Al₁₂ in HPDC AE42 alloy at high cooling rates and high pressure is likely due to the supersaturation of Al in (Mg), in addition to the preferential formation of Al₁₁RE₃ and Al₂RE phases.