【摘 要】
：
Formation of periodically layered structure in Fe3Si/Zn diffusion couples after annealing at 450 ℃ was investigated.The results showed that periodical layer pair in the reaction zone was composed of t
【机 构】
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School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;Jiangsu K
【出 处】
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第十七届全国相图学术会议暨相图与材料设计国际研讨会
论文部分内容阅读
Formation of periodically layered structure in Fe3Si/Zn diffusion couples after annealing at 450 ℃ was investigated.The results showed that periodical layer pair in the reaction zone was composed of two layers: FeSi layer and FeZn13+r-Zn layer.The time-dependent growth of periodical layers is linear suggesting a surface reaction controlled process in the solid-liquid reaction.Thickness and morphology of periodic layered structure are dependent on the crystallographic orientation of Fe3Si grain and it is difficult to form on the plane (001) of Fe3Si grain.The formation of periodical layer pair is originated from the diffusion mobility difference between Fe,Si and Zn, and the reason of anisotropic growth of periodically layered structure can be attributed to the interface-state density difference.Thermodynamic foundation and mechanism of formation of the periodically layered structure are elaborated in this work.
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