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Experimental investigation and thermodynamic re-assessment of the Mn–Gd binary system

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Abstract

In this work, 13 Mn–Gd alloys prepared by arc-melting method were investigated experimentally by means of differential thermal analysis. The temperatures of the invariant reactions and liquidus in the Mn–Gd binary system were determined according to the measured thermal analysis curves. One key as-cast Mn70Gd30 alloy was examined using differential thermal analysis and scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy to confirm the type of the invariant reaction (L + Mn23Gd6 ↔ Mn2Gd). Based on the critical review of the available experimental data measured in the present work and in the reported literature, the Mn–Gd binary system was assessed thermodynamically using the CALPHAD method. The solid solution phases including liquid, α-Mn, β-Mn, γ-Mn, δ-Mn, α-Gd and β-Gd are modeled by the substitutional solution model, while the intermetallic compounds such as GdMn2, Gd6Mn23 and GdMn12 are treated as the stoichiometric compounds. A set of self-consistent thermodynamic parameters obtained finally to describe the Gibbs energies of various phases in the Mn–Gd binary system can be used to reproduce well phase equilibria and thermodynamic data.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (51461013), National Basic Foundation of China (2014CB643703), the Guangxi Natural Science Foundation (2013GXNSFCA019017, 2014GXNSFBA118235, 2016GXNSFDA380015, 2016GXNSFGA380001) and the Research Foundation of Guangxi Education Department (2013YB088, KY2016YB166). The authors also acknowledge the Research Foundation of Graduate Education Innovation Program, Guilin University of Electronic Technology, China (YJCXS201568), for financial support.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, 541004, People’s Republic of China

    Jiang Wang, Shidong Lin, Maohua Rong, Guanghui Rao & Huaiying Zhou

  2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin, 541004, People’s Republic of China

    Jiang Wang, Maohua Rong, Guanghui Rao & Huaiying Zhou

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  1. Jiang Wang
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  2. Shidong Lin
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  3. Maohua Rong
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  4. Guanghui Rao
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Correspondence to Jiang Wang or Maohua Rong.

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Wang, J., Lin, S., Rong, M. et al. Experimental investigation and thermodynamic re-assessment of the Mn–Gd binary system. J Therm Anal Calorim 128, 1009–1018 (2017). https://doi.org/10.1007/s10973-016-6000-y

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  • DOI: https://doi.org/10.1007/s10973-016-6000-y

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