Modelling temperature- and composition-dependent thermal conductivity in alloys is challengeable and is seldom studied systematically. In the present work, a new model is developed to describe the temperature and concentration dependence of thermal conductivity for binary alloys. In this new model, firstly thermal conductivity of pure metals was modelled as the function of temperature for each phase and each magnetic state by the corresponding physically sound model. Secondly, in order to describe the composition and temperature dependence of thermal conductivity for solid phases, the combination of the theories of Nordheim and Mott for electric conductivity of alloys with the Wiedemann-Franz law was performed. Thirdly, the reliability of the new model was verified by presently measured thermal conductivities for pure Co, Ni and Co-Ni alloys at 300, 600, 900 and 1100 K as well as for binary Al-Zn, Mg-Zn and U-Zr systems using the data taken from the literature. The calculated thermal conductivities can well reproduce the measured ones in one-phase regions of a series of Co-Ni alloys. The thermal conductivity in a two-phase region of the Co-Ni system is reasonably predicted as well. It is demonstrated that the new model can be utilized to evaluate the thermal conductivity over the whole investigated composition and temperature ranges for the first time and is expected to be extended to ternary and multicomponent systems by CALPHAD method, which contributes significantly to the development of computational design of materials.

对合金中与温度和成分有关的热导率进行建模具有挑战性，并且很少进行系统的研究。在当前的工作中，开发了一个新的模型来描述二元合金的温度和导热系数对浓度的依赖性。在这个新模型中，首先通过相应的物理声模型将纯金属的热导率建模为每个相和每个磁态的温度的函数。其次，为了描述固相的热导率的组成和温度依赖性，将诺德海姆和莫特的合金电导率理论与Wiedemann-Franz定律相结合。第三，通过目前测得的纯Co的热导率验证了新模型的可靠性，使用从文献中获得的数据，可在300、600、900和1100 K以及用于二元Al-Zn，Mg-Zn和U-Zr系统的Ni和Co-Ni合金。计算出的热导率可以很好地再现一系列Co-Ni合金的单相区域中测得的热导率。合理地预测了Co-Ni系统的两相区域中的热导率。结果表明，该新模型可用于评估所研究的整个组成和温度范围内的热导率，并且有望通过CALPHAD方法扩展到三元和多组分系统，这将极大地促进计算的发展。材料设计。计算出的热导率可以很好地再现一系列Co-Ni合金的单相区域中测得的热导率。合理地预测了Co-Ni系统的两相区域中的热导率。结果表明，该新模型可用于评估所研究的整个组成和温度范围内的热导率，并且有望通过CALPHAD方法扩展到三元和多组分系统，这将极大地促进计算的发展。材料设计。计算出的热导率可以很好地再现一系列Co-Ni合金的单相区域中测得的热导率。合理地预测了Co-Ni系统的两相区域中的热导率。结果表明，该新模型可用于评估所研究的整个组成和温度范围内的热导率，并且有望通过CALPHAD方法扩展到三元和多组分系统，这将极大地促进计算的发展。材料设计。