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Reactive Diffusion between Solid Fe and Liquid Zn at 723 K

机译:固态铁和液态锌在723 K下的反应扩散

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摘要

Reactive diffusion between solid Fe and liquid Zn was experimentally examined using Fe/Zn diffusion couples prepared by an immersion technique. Using this technique, a pure iron sheet was immersed in a molten pure Zn bath with a constant temperature of T=723 K (450℃) for various times up to t=7.2x10~3s (2 h). The microstructure of the cross section of the Fe/Zn diffusion couple was observed by scanning electron microscopy, and the chemical composition of each phase was determined by electron probe micro-analysis. Interface concentrations of Fe for the ζ-FeZn_(13) and δ-FeZn_(7-10) phases at the ζ/δ interface, c~(ζδ) and c~(δζ), and for the liquid-Zn (L) phase at the ζ/L interface, c~(Lζ), determined from the diffusion couples were found to be extremely higher than the corresponding equilibrium values, especially in the early stage of t< 300 s, and the difference gradually decreased during immersion. The deviations from the equilibrium values for the c~(ζδ) and c~(Lζ) were proportional to the interdiffusion flux across the ζ phase layer.
机译:使用浸没技术制备的Fe / Zn扩散对,通过实验检查了固态Fe和液态Zn之间的反应性扩散。使用该技术,将纯铁板浸入具有恒定温度T = 723 K(450℃)的熔融纯Zn浴中,直到t = 7.2x10〜3s(2 h)。通过扫描电子显微镜观察Fe / Zn扩散对的截面的显微组织,并通过电子探针显微分析确定各相的化学组成。在ζ/δ界面的c-(ζδ)和c〜(δζ)的ζ-FeZn_(13)和δ-FeZn_(7-10)相的Fe的界面浓度以及液态Zn(L)的Fe的界面浓度发现由扩散偶确定的ζ/ L界面处的相c〜(Lζ)远高于相应的平衡值,尤其是在t <300 s的早期,并且在浸入过程中差异逐渐减小。 c〜(ζδ)和c〜(Lζ)的平衡值偏差与穿过ζ相层的互扩散通量成正比。

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