PHASE FIELD SIMULATION ON MORPHOLOGY OF CONTINUOUS PRECIPITATE Mg17Al12IN Mg-Al ALLOY

doi:10.3724/SP.J.1037.2012.00531

Acta Metall Sin

2013, Vol. 49

Issue (3): 277-283 DOI: 10.3724/SP.J.1037.2012.00531

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PHASE FIELD SIMULATION ON MORPHOLOGY OF CONTINUOUS PRECIPITATE Mg₁₇Al₁₂IN Mg-Al ALLOY

HAN Guomin¹, HAN Zhiqiang¹, Alan A. Luo², Anil K. Sachdev², LIU Baicheng^{1, 3}

1) Key Laboratory for Advanced Materials Processing Technology (Ministry of Education), Department of Mechanical,Engineering, Tsinghua University, Beijing 100084

2) Chemical Sciences and Materials Systems Laboratory, General Motors Global Research and Development Center,Warren, MI 48090-9055, USA

3) State Key Laboratory of Automotive Safety and Energy, Department of Automotive Engineering, Tsinghua University,Beijing 100084

Cite this article:

HAN Guomin, HAN Zhiqiang, Alan A. Luo, Anil K. Sachdev, LIU Baicheng. PHASE FIELD SIMULATION ON MORPHOLOGY OF CONTINUOUS PRECIPITATE Mg₁₇Al₁₂IN Mg-Al ALLOY. Acta Metall Sin, 2013, 49(3): 277-283.

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Abstract

The morphology evolution of the continuous precipitate Mg₁₇Al₁₂ in aging process was studiedusing KKS phase field model. In the model, the chemical free energy and chemical potential for the precipitatephase and matrix were obtained by using Thermo-Calc software and database. The effects of interfacial energyanisotropy were taken into account by introducing interface anisotropy function, and the effects of micro elasticstrain energy were introduced based on the theory of micro elastic strain energy formulated by Khachaturya. It isdemonstrated that the precipitate phase has a lath shape when only the interfacial energy anisotropy wasconsidered regardless of the micro elastic strain energy.The precipitate phase grows into a diamond shape whenonly the micro elastic strain energy was taken into account regardless of the interfacial energy anisotropy. Whenboth the effects of the interfacial energy anisotropy and the micro elastic strain energy were considered in thesimulation, the precipitate phase has a lath shape with lozenge ends,which is in agreement with experimental observations. The interfacial energy anisotropy affectsthe overall morphology of the precipitate, and combiningthe interfacial energy anisotropy and the micro elastic strain energy results in the lath shape with lozenge ends.

Key words: Mg-Al alloy continuous precipitate morphology evolution thermodynamic calculation interfacial energyanisotropy micro elastic strain energy phase-field model

Received: 10 September 2012

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	HAN Guomin
	HAN Zhiqiang
	Alan A. Luo
	Anil K. Sachdev
	LIU Baicheng

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2012.00531 OR https://www.ams.org.cn/EN/Y2013/V49/I3/277

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