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Experimental and Diffusion Simulation for the Homogenization of As-cast Mg-Al, Mg-Zn, and Mg-Al-Zn Alloys

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Abstract

Annealing of as-cast Mg-Al alloys (3, 6, and 9 wt pct Al) and Mg-Zn alloys (1.5, 4.0, and 5.5 wt pct Zn) was performed at 603 K and 673 K (330 °C and 400 °C) for 1, 2, 4, and 8 hours to systematically investigate the variation of second phase fraction and solute concentration profile in Mg matrix using SEM image analysis and EMPA-WDS, respectively. To calculate second phase fraction and solute concentration profile, a diffusion model considering the moving boundary was constructed, and the experimental results were successfully explained by the model. The expansion of model to ternary Mg-Al-Zn alloy is also described. This model can be used for the optimization of homogenization process of the Mg alloys.

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Acknowledgments

Financial support from the General Motor of Canada and the Natural Sciences and Engineering Research Council of Canada (NSERC) is greatly appreciated. This work was also partially supported by the Fundamental Research and Development Program for Core Technology of Materials by the Ministry of Knowledge Economy of the Republic of Korea (Grant No. 10037273). The authors greatly acknowledge Dr. E. Essadiqi at CANMET and Mr. Shi Lang at McGill University, Montreal, for Cu mold plate and wedge-casting samples and help with the micro-probe analysis (EPMA), respectively.

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Authors and Affiliations

  1. Department of Mining and Materials Engineering, McGill University, Montreal, QC, H3A 0C5, Canada

    Sazol Kumar Das (Ph.D. Student), Dae-Hoon Kang (Post-Doctoral fellow, Research Metallurgist) & In-Ho Jung (Associate Professor)

  2. Novelis Global Research and Technology Center, Kennesaw, GA, 30144, USA

    Dae-Hoon Kang (Post-Doctoral fellow, Research Metallurgist)

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  1. Sazol Kumar Das
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Correspondence to In-Ho Jung.

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Manuscript submitted January 23, 2014.

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Das, S.K., Kang, DH. & Jung, IH. Experimental and Diffusion Simulation for the Homogenization of As-cast Mg-Al, Mg-Zn, and Mg-Al-Zn Alloys. Metall Mater Trans A 45, 5212–5225 (2014). https://doi.org/10.1007/s11661-014-2443-6

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