The Diffusion Coefficients Of Cu And Zn In Α- And Η- Solid Solutions
The Diffusion Coefficients Of Cu And Zn In Α- And Η- Solid Solutions
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Cu和Zn在α-和H-固溶体中的扩散系数
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
J. Jani
中科院分区：
文献类型：
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作者：
A. Hoxha;J. Jani
本文对无限长Cu-Zn电偶中的多相扩散进行了实验研究。扩散偶采用电镀技术制备。在三个不同的温度下对样品进行退火，所述温度低于Zn的熔化温度。对于每个温度，使用六种不同的退火时间，范围从1小时到32小时。在由光学显微镜提供的显微照片中，可以看到在Cu-Zn相图中存在的三种金属间相中仅形成两种，即ε相和γ相。用WDX电子探针分析获得了扩散层的浓度分布，用Fick第二定律的解计算了Cu和Zn在α和η固溶体中的扩散系数。由于扩散系数只取决于退火的温度而不取决于退火的时间，所以对于给定的温度，它们必须相同。因此，对每个温度的扩散系数取平均值。知道每个温度下的扩散系数，也可以计算活化能和频率因子。
In this work, the multiphase diffusion in the infinite couple Cu-Zn, was studied experimentally. The diffusion couples were prepared by platting technique. The samples were annealed in three different temperatures, which were taken below the melting temperature of Zn. For each temperature, there were used six different annealing times, ranging from 1h up to 32h. In the micrographs provided by light microscopy, it can be seen the formation of only two of the three intermetalic phases present in the Cu-Zn phase diagram, namely εand γ-phase. WDX EPMA analysis was used to obtain the concentration profiles of the diffusion layers.he diffusion coefficients of Cu and Zn in αand η-solid solutions, are calculated using the solutions of second Fick’s law, for independent concentration case. Since the diffusion coefficients depends only on the temperature of annealing and not on the time of it, they must be the same for a given temperature. Therefore the diffusion coefficients were averaged for each temperature. Knowing the diffusion coefficients for each temperature, enables the calculation of the activation energies and the frequency factors as well.