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| Thermodynamic Analysis Of The Precipitation Behavior Of Nd And Sr In The Mg-Al Based Alloys |
| Yufeng Wu;; |
| 北京工业大学材料学院 |
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Cite this article:
Yufeng Wu. Thermodynamic Analysis Of The Precipitation Behavior Of Nd And Sr In The Mg-Al Based Alloys. Acta Metall Sin, 2006, 42(5): 487-491 .
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Abstract The heat resistance of Mg alloys can be improved by adding rare earth and alkaline earth elements into Mg-Al alloys. Based on the binary phase diagrams of Al-Sr and Al-Nd、Miedema model and Toop model, the thermodynamic calculation model for predicting the precipitation behavior of the Al-Sr and Al-Nd intermetallic compounds in a ternary alloy system was deduced. The temperature of precipitating Al-Sr intermetalic compound in the Mg-8Al-3.5Sr ternary system was calculated by using this model. The calculated results are in good agreement with the references, indicating this calculated model is feasible. The lowest content of X (X=Nd、Sr), making the Al-X intermetallic compounds precipitate prior to α-Mg in the Mg-9Al-X and Mg-6Al-X (X=Nd、Sr), was calculated based on this model. According to the calculated results, the precipitation behaviors of the Al2Sr and Al11Nd3 intermetallic compounds were analyzed and the effects of these compounds to the properties of Mg alloys were discussed. A new method to prepare the heat resistance of Mg alloys by adding Nd and Sr was proposed.
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Received: 18 August 2005
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