Thermal conductivity is one of the important thermophysical properties for describing the ability of a material to transfer heat. The thermal conductivities and microstructures of Cu–Ag, Cu–Cr and Cu–Zr binary alloys were experimentally investigated. 11 equilibrated binary alloys were designed and prepared annealed at 600 °C for 60 days. Their phase equilibria and compositions were analyzed by scanning electron microscopy with energy dispersive X-ray spectrometry (SEM/EDS), and the thermal diffusivities at 20, 100, 200 and 300 °C and the densities at room temperature were measured by laser flash analysis (LFA) method and Archimedes method, respectively. The heat capacities of alloys at different temperatures were calculated through the thermodynamic database, and then the experimental thermal conductivities of each alloys were obtained by the specific conversion equation. Based on the experimental data from the literature and present work, the thermal conductivities of pure elements, the solid solution phases, the stoichiometric compounds and the two-phase regions were evaluated by the CALPHAD (CALculation of PHAse Diagrams) approach. A set of self-consistent thermal conductivity parameters for description of the Cu–Ag–Cr–Zr system was obtained. Comprehensive comparisons between the calculated and experimental results show that the experimental thermal conductivities were satisfactorily accounted for by the present modeling. The present research results can provide important thermal conductivity information for designing new copper alloys and enrich the thermophysical database of copper alloys.

中文翻译：

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Cu-Ag-Cr-Zr 体系热导率的实验研究和 CALPHAD 建模


导热系数是描述材料传递热量的能力的重要热物理性质之一。对Cu-Ag、Cu-Cr和Cu-Zr二元合金的热导率和微观结构进行了实验研究。设计并制备了 11 种平衡二元合金，并在 600 °C 下退火 60 天。通过扫描电子显微镜和能量色散X射线光谱仪（SEM/EDS）分析了它们的相平衡和成分，并通过激光闪光分析测量了20、100、200和300°C的热扩散率以及室温下的密度。分别是（LFA）法和阿基米德法。通过热力学数据库计算不同温度下合金的热容，然后通过特定的换算方程得到各合金的实验热导率。基于文献和现有工作中的实验数据，通过 CALPHAD（PHAse 图计算）方法评估了纯元素、固溶体相、化学计量化合物和两相区域的热导率。获得了一组用于描述Cu-Ag-Cr-Zr体系的自洽导热系数参数。计算结果与实验结果之间的综合比较表明，本模型令人满意地解释了实验热导率。本研究成果可为设计新型铜合金提供重要的导热系数信息，丰富铜合金的热物理数据库。