Abstract The electromigration effect in spark plasma sintering (SPS) (a.k.a. field assisted sintering) is quantitively analyzed in the Fe-Al diffusion couple system. In SPS, the samples are heated by a high applied voltage and electric current, which can lead to an electromigration effect. Finite element analysis is utilized to determine the voltage applied to the Fe-Al diffusion couple, which is found to be order of magnitudes smaller than the overall system voltage, indicating the electron wind force would be the dominant mechanism for electromigration in SPS. Additionally, the simulation suggests the temperature and current density distribution is uniform across the metallic diffusion couple, which makes quantitative measurement feasible. A mathematic algorithm that allows diffusivity and electromigration coefficients to be solved, is developed for the Fe-Al, where multiple intermetallic phases coexist. At temperatures below aluminum melting, Fe2Al5 is the single intermetallic phases formed in Fe-Al system, for which electromigration is negligible. At temperatures above aluminum melting, FeAl2, FeAl and α-Fe solid solution phases coexist. Among them, the electromigration effect is noticeable in FeAl phase and is significant in the FeAl2 phase. The corresponding electromigration enhancement constants are calculated.

中文翻译：

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Fe-Al扩散耦合场辅助烧结的电迁移效应

摘要 在 Fe-Al 扩散偶系统中定量分析了放电等离子体烧结 (SPS)（又名场辅助烧结）中的电迁移效应。在 SPS 中，样品被高电压和电流加热，这会导致电迁移效应。有限元分析用于确定施加到 Fe-Al 扩散偶上的电压，发现该电压比整个系统电压小几个数量级，表明电子风力将是 SPS 中电迁移的主要机制。此外，模拟表明金属扩散偶上的温度和电流密度分布是均匀的，这使得定量测量成为可能。一种数学算法，可以求解扩散系数和电迁移系数，为 Fe-Al 开发，其中多种金属间相共存。在低于铝熔化的温度下，Fe2Al5 是在 Fe-Al 系统中形成的单一金属间相，对此电迁移可以忽略不计。在高于铝熔化的温度下，FeAl2、FeAl 和 α-Fe 固溶体相共存。其中，电迁移效应在 FeAl 相中显着，在 FeAl2 相中显着。计算相应的电迁移增强常数。电迁移效应在 FeAl 相中显着，在 FeAl2 相中显着。计算相应的电迁移增强常数。电迁移效应在 FeAl 相中显着，在 FeAl2 相中显着。计算相应的电迁移增强常数。