ABSTRACT Using in situ transmission-electron-microscopy (TEM) heating and subsequent energy-filtered TEM (EF-TEM) and high-resolution-TEM (HR-TEM) analysis on a newly developed 3Co–3W–9Cr steel, enrichment of boron at the Fe2W and matrix interface has been studied for the first time. The heat treatment has been carried out at a temperature of 770°C. From the EF-TEM analysis, it is confirmed that a stacking-fault-assisted diffusion mechanism is responsible for enrichment of boron at the interface. From the HR-TEM study, it is ascertained that the diffusion behaviour of boron in the Laves phase and the extent of the enrichment at the interface is dependent on the amount of stacking faults in the Laves phase.

中文翻译：

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Laves 相中硼的扩散和界面富集：新开发的 3Co-3W-9Cr 钢的原位 TEM 热处理研究

摘要使用原位透射电子显微镜 (TEM) 加热和随后的能量过滤 TEM (EF-TEM) 和高分辨率 TEM (HR-TEM) 分析新开发的 3Co-3W-9Cr 钢，富集硼首次研究了 Fe2W 和基体界面。热处理在770℃的温度下进行。从 EF-TEM 分析可以证实，堆叠故障辅助扩散机制是界面处硼富集的原因。从 HR-TEM 研究可以确定，硼在 Laves 相中的扩散行为和界面处的富集程度取决于 Laves 相中的堆垛层错数量。