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

IF 5.6 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Minerals, Metallurgy, and Materials Pub Date : 2024-01-26 DOI:10.1007/s12613-023-2759-6
Hongxia Li, Wenjun Xu, Yufei Zhang, Shenglan Yang, Lijun Zhang, Bin Liu, Qun Luo, Qian Li
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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.

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用 CALPHAD 方法预测镁铝镭合金的热导率
镁铝合金具有出色的强度和延展性,但由于添加了铝,导热率相对较低。准确预测热导率是设计高热导率镁铝合金的先决条件。因此,必须建立预测与温度和成分有关的导热系数的数据库。本研究设计了具有不同 Al2La、Al3La 和 Al11La3 相含量以及 Al 在 α-Mg 相中固溶度的 Mg-Al-La 合金。研究了第二相和铝固溶度对热导率的影响。实验结果表明,在 La 含量不变的情况下,随着 Al 含量的增加,第二相从 Al2La 转变为 Al3La,并进一步转变为 Al11La3。第二相对热扩散率的负面影响程度依次为 Al2La > Al3La > Al11La3。与第二相相比,Al 在 α-Mg 中固溶度的增加显著降低了热导率。在实验数据的基础上,通过相图计算(CALPHAD)方法建立了 Mg-Al-La 体系的倒易热扩散率数据库。在标准误差为 ±1.2 W/(m-K) 的情况下,预测结果与实验数据十分吻合。所建立的数据库可用于设计具有高热导率的镁铝合金,并为拓展其应用前景提供有价值的指导。
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来源期刊
CiteScore
9.30
自引率
16.70%
发文量
205
审稿时长
2 months
期刊介绍: International Journal of Minerals, Metallurgy and Materials (Formerly known as Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material) provides an international medium for the publication of theoretical and experimental studies related to the fields of Minerals, Metallurgy and Materials. Papers dealing with minerals processing, mining, mine safety, environmental pollution and protection of mines, process metallurgy, metallurgical physical chemistry, structure and physical properties of materials, corrosion and resistance of materials, are viewed as suitable for publication.
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