Prediction of the thermal conductivity of Mg–Al–La alloys by CALPHAD method

Hongxia Li; Wenjun Xu; Yufei Zhang; Shenglan Yang; Lijun Zhang; Bin Liu; Qun Luo; Qian Li

doi:10.1007/s12613-023-2759-6

Volume 31 Issue 1

Jan. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(1): 129-137

Hongxia Li, Wenjun Xu, Yufei Zhang, Shenglan Yang, Lijun Zhang, Bin Liu, Qun Luo, and Qian Li, Prediction of the thermal conductivity of Mg–Al–La alloys by CALPHAD method, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 129-137. https://doi.org/10.1007/s12613-023-2759-6

Cite this article as:

Hongxia Li, Wenjun Xu, Yufei Zhang, Shenglan Yang, Lijun Zhang, Bin Liu, Qun Luo, and Qian Li, Prediction of the thermal conductivity of Mg–Al–La alloys by CALPHAD method, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 129-137. https://doi.org/10.1007/s12613-023-2759-6

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Research Article

Prediction of the thermal conductivity of Mg–Al–La alloys by CALPHAD method

+ Author Affiliations

Corresponding authors:
Qun Luo E-mail: qunluo@shu.edu.cn

Qian Li E-mail: cquliqian@cqu.edu.cn
Received: 7 August 2023; Revised: 27 September 2023; Accepted: 9 October 2023; Available online: 12 October 2023

Abstract

Abstract

Mg−Al alloys have excellent strength and ductility but relatively low thermal conductivity due to Al addition. The accurate prediction of thermal conductivity is a prerequisite for designing Mg−Al alloys with high thermal conductivity. Thus, databases for predicting temperature- and composition-dependent thermal conductivities must be established. In this study, Mg−Al−La alloys with different contents of Al₂La, Al₃La, and Al₁₁La₃ phases and solid solubility of Al in the α-Mg phase were designed. The influence of the second phase(s) and Al solid solubility on thermal conductivity was investigated. Experimental results revealed a second phase transformation from Al₂La to Al₃La and further to Al₁₁La₃ with the increasing Al content at a constant La amount. The degree of the negative effect of the second phase(s) on thermal diffusivity followed the sequence of Al₂La > Al₃La > Al₁₁La₃. Compared with the second phase, an increase in the solid solubility of Al in α-Mg remarkably reduced the thermal conductivity. On the basis of the experimental data, a database of the reciprocal thermal diffusivity of the Mg−Al−La system was established by calculation of the phase diagram (CALPHAD) method. With a standard error of ±1.2 W/(m·K), the predicted results were in good agreement with the experimental data. The established database can be used to design Mg−Al alloys with high thermal conductivity and provide valuable guidance for expanding their application prospects.
- magnesium alloy;
- thermal conductivity;
- thermodynamic calculations;
- materials computation

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