Simultaneous tracer diffusion and interdiffusion in a sandwich-type configuration to provide the composition dependence of the tracer diffusion coefficients
Simultaneous tracer diffusion and interdiffusion in a sandwich-type configuration to provide the composition dependence of the tracer diffusion coefficients
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DOI：
10.1080/14786435.2014.965234
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发表时间：
2014-10
影响因子：
1.6
通讯作者：
I. Belova;N. Kulkarni;Y. Sohn;G. Murch
中科院分区：
文献类型：
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作者：
I. Belova;N. Kulkarni;Y. Sohn;G. Murch
本文提出了一种新的二元互扩散偶示踪-互扩散联合实验方法。分析需要一个相互扩散对，最初包含一个薄层的示踪剂的一个或两个组成元素在原来的接口的对（三明治相互扩散实验）。这种类型的相互扩散实验最早由J.R.曼宁本文提出的理论分析是基于一个新发展的同位素相互扩散的唯象理论结合玻尔兹曼Matano形式主义。这种新的分析现在提供了一种手段，以获得的成分依赖的互扩散系数和示踪剂的扩散系数同时从分析的互扩散和示踪剂的个人资料，在一个单一的三明治互扩散实验。新的分析是成功地应用到曼宁的原始的“三明治相互扩散”实验中的银-镉系统（共六对）的结果，并验证了独立测定的银和镉示踪剂扩散系数Schoen使用传统的薄膜技术。提出了进一步发展三明治互扩散实验和分析多元合金情况的建议。
In this paper, a new formalism of a combined tracer and interdiffusion experiment for a binary interdiffusion couple is developed. The analysis requires an interdiffusion couple that initially contains a thin layer of tracers of one or both of the constituent elements at the original interface of the couple (sandwich interdiffusion experiment). This type of interdiffusion experiment was first performed in 1958 by J.R. Manning. The theoretical analysis presented in this paper is based on a newly developed phenomenological theory of isotopic interdiffusion combined with the Boltzmann–Matano formalism. This new analysis now provides the means to obtain the composition dependent interdiffusion coefficient and tracer diffusion coefficients simultaneously from analysis of the interdiffusion and tracer profiles in a single sandwich interdiffusion experiment. The new analysis is successfully applied to the results of Manning’s original ‘sandwich interdiffusion’ experiment in the Ag–Cd system (six couples in total) and is validated with an independent determination of the Ag and Cd tracer diffusion coefficients by Schoen using the conventional thin film technique. Suggestions for further development of the sandwich interdiffusion experiment and analysis to the case of multicomponent alloys are provided.