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Effects of Sb Content on Solidification Pathways and Grain Size of AZ91 Magnesium Alloy

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The phase constitution and solidification pathways of AZ91 + xSb (x = 0, 0.1, 0.5, 1, in wt%) alloys were investigated through ways of microstructure observation, thermal analysis technique, and thermodynamic calculation. It was found that the non-equilibrium solidification microstructure of AZ91 + xSb (x = 0.1, 0.5, 1) is composed of α-Mg matrix, β-Mg17Al12 phase, and intermetallic compound Mg3Sb2. The grain size of the alloys with different Sb contents was quantitatively determined by electron backscattered diffraction technique which shows no grain refinement in Sb-containing AZ91 alloy. Thermodynamic calculations are in reasonable agreement with thermal analysis results, showing that the Mg3Sb2 phase forms after α-Mg nucleation, thus impossible acts as heterogeneous nucleus for α-Mg dendrite. Besides, the solid fraction at dendrite coherency point (f DCPs ) determined from thermal analysis decreases slightly with increasing Sb content, which is consistent with the fact that Sb does not refine the grain size of AZ91 alloy.

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Acknowledgments

This work was financially supported by the National Basic Research Program of China (No. 2013CB632202) and the National Natural Science Foundation of China (Nos. 51105350 and 51301173) is acknowledged. Dr. J.L. Li is also acknowledged for his kind English revision on this manuscript.

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Authors and Affiliations

  1. School of Material Science and Engineering, Dalian University of Technology, Dalian, 116024, China

    Dan-Hui Hou & Chuang Dong

  2. Institute of Metal Research, Chinese Academy of Science, Shenyang, 110016, China

    Dan-Hui Hou, Rong-Shi Chen & En-Hou Han

  3. Institute of Metallurgy, Clausthal University of Technology, 38678, Clausthal-Zellerfeld, Germany

    Song-Mao Liang

Authors
  1. Dan-Hui Hou
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  2. Song-Mao Liang
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Correspondence to Rong-Shi Chen.

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Available online at http://link.springer.com/journal/40195

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Hou, DH., Liang, SM., Chen, RS. et al. Effects of Sb Content on Solidification Pathways and Grain Size of AZ91 Magnesium Alloy. Acta Metall. Sin. (Engl. Lett.) 28, 115–121 (2015). https://doi.org/10.1007/s40195-014-0178-4

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  • DOI: https://doi.org/10.1007/s40195-014-0178-4

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