运用CALPHAD 方法预测Mg–Al–La 合金的热导率

李鸿霞; 徐文俊; 张宇飞; 杨胜兰; 张利军; 刘斌; 罗群; 李谦

doi:10.1007/s12613-023-2759-6

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文章导航 > 矿物冶金与材料学报（英文） > 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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研究论文

运用CALPHAD 方法预测Mg–Al–La 合金的热导率

1)
上海大学省部共建高品质特殊钢冶金与制备国家重点实验室&上海市钢铁冶金新技术开发应用重点实验室&材料科学与工程学院，上海 200444，中国
2)
重庆大学国家镁合金材料工程技术研究中心，重庆 400044，中国
3)
中南大学粉末冶金国家重点实验室，长沙 410083，中国
4)
重庆大学材料科学与工程学院，重庆 400444，中国
5)
重庆大学高端装备铸造技术全国重点实验室，重庆 400444，中国

通讯作者:
罗群 E-mail: qunluo@shu.edu.cn

李谦 E-mail: cquliqian@cqu.edu.cn

文章亮点

（1）通过构建热扩散热阻与温度之间的关系，建立了Mg–Al–La合金体系的热导率数据库

（2）采用建立的热导率数据库，成功预测了富镁角Mg–Al–La合金的热导率分布

（3）总结并提出了，与第二相相比，α-Mg相中Al的固溶度对导热系数影响更为显着

中文摘要

Mg–Al合金作为最常用的铸造镁合金，以其卓越的强度和延展性而得到广泛应用，然而由于Al元素的添加导致热导率显著降低。准确预测导热系数是设计高导热镁铝合金的关键先决条件。因此，须建立用于预测与温度和成分相关的热导率的数据库。本研究通过热力学计算设计了六种含有不同Al₂La、Al₃La、Al₁₁La₃相含量以及Al在α-Mg相中固溶度不同的Mg–Al–La合金。实验结果表明，在La量保持恒定的情况下，随着Al含量的增加，合金中的第二相由Al₂La相向Al₃La相转变，并进一步向Al₁₁La₃相转变。其中第二相对Mg–Al–La合金热扩散率的负面影响为：Al₂La相 > Al₃La相 > Al₁₁La₃相。然而，在第二相含量相同但种类不同的三元合金中发现位于α-Mg + Al₁₁La₃两相区内且Al在基体α-Mg中固溶度最大的三元合金对应的热导率最小。这表明，与第二相相比，Al在基体α-Mg 中固溶度的增加显着降低了合金的热导率。基于实验数据，采用相图计算（CALPHAD）方法构建了Mg–Al–La体系的热扩散热阻数据库，得到的计算结果与实验结果吻合较好，标准误差为±1.2 W/(m·K)。Mg–Al系合金热导率数据库的建立可以为高导热镁铝合金的设计提供理论指导并拓展其应用前景。

关键词:

Research Article

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

+ Author Affiliations

1)
State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
2)
National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China
3)
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
4)
College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
5)
National Key Laboratory of Advanced Casting Technologies, Chongqing University, Chongqing 400044, China

Qian Li and Qun Luo are an editorial board member and a youth editorial board member for IJMMM, respectively, and are not involved in the editorial review or the decision to publish this article. All authors declare that they have no financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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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