The diffusion behavior and phase equilibria in the Cu-Zn binary system were investigated using solid–solid and solid–liquid diffusion couples. Heat treatments at temperatures ranging from 100 to 750 °C were performed and the samples were examined using optical microscopy, energy dispersive x-ray spectroscopy, and electron probe microanalysis to identify the phases and to obtain composition profiles. Solubility limits of both solid solution and intermetallic phases were then evaluated, and a forward-simulation analysis (FSA) was applied to extract interdiffusion coefficients. The composition profiles from Hoxha et al. were also re-analyzed using FSA to obtain more reliable diffusion coefficient data without the assumption of constant diffusion coefficients for the intermetallic phases. A comprehensive assessment of the interdiffusion coefficients in three intermetallic phases of the Cu-Zn system was performed based on the results from the current study as well as those in the literature. Activation energies and Arrhenius pre-factors were evaluated for each phase as a function of composition. The fitted equations based on the comprehensive assessment have the capabilities of computing the interdiffusion coefficients of each of the phases at a given composition and temperature. Suggested modifications to the Cu-Zn binary phase diagram were presented based on the new experimental information gathered from the present study. A clear explanation is provided for the puzzling low Zn concentrations often observed in the Cu-rich fcc phase of Cu-Zn diffusion couples in comparison with the expected high solubility values based on the equilibrium Cu-Zn phase diagram.

中文翻译：

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使用扩散偶研究铜锌二元体系的扩散系数和相平衡

使用固-固和固​​-液扩散偶研究了Cu-Zn二元体系中的扩散行为和相平衡。在 100 至 750 °C 的温度范围内进行热处理，并使用光学显微镜、能量色散 X 射线光谱和电子探针微量分析检查样品，以识别相并获得成分分布图。然后评估固溶体和金属间化合物相的溶解度极限，并应用正向模拟分析 (FSA) 来提取相互扩散系数。Hoxha 等人的成分概况。还使用 FSA 重新分析，以获得更可靠的扩散系数数据，而无需假设金属间相的扩散系数恒定。基于当前研究的结果以及文献中的结果，对 Cu-Zn 系统的三个金属间相中的相互扩散系数进行了综合评估。对作为组成函数的每个相的活化能和阿伦尼乌斯前因数进行评估。基于综合评估的拟合方程具有计算给定成分和温度下每个相的相互扩散系数的能力。根据从本研究中收集的新实验信息，提出了对 Cu-Zn 二元相图的建议修改。