Abstract The microstructure of WC-(Co+Ru) cemented carbides was studied using transmission Kikuchi diffraction (TKD). We report that the CoFCC grains contain Σ3-annealing twins which undergo an incomplete martensitic transformation to form CoHCP laths on cooling below TMs. The parent CoFCC and product CoHCP phases are related via the Shoji-Nishiyama orientation relationship. Four variants of the CoHCP plates exhibit a special misorientation of 70.5 ± 0.2° 〈 11 2 ¯ 0 〉 . A higher transformed fraction was observed in the sample possessing the lower binder content and finer WC grains. We suggest that this is due to the availability of more WC-binder interfaces, which facilitate CoHCP plate nucleation.

中文翻译：

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使用透射菊池衍射观察 WC-(Co+Ru) 硬质合金中的粘结剂微观结构

摘要 利用透射菊池衍射(TKD) 研究了WC-(Co+Ru) 硬质合金的微观结构。我们报告说 CoFCC 晶粒含有 Σ3-退火孪晶，它们在低于 TM 的冷却条件下经历不完全的马氏体转变以形成 CoHCP 板条。母体 CoFCC 和产物 CoHCP 相通过 Shoji-Nishiyama 取向关系相关联。CoHCP 板的四种变体表现出 70.5 ± 0.2° 〈 11 2 ¯ 0 〉 的特殊错误取向。在具有较低粘合剂含量和较细 WC 晶粒的样品中观察到较高的转化率。我们认为这是由于更多 WC-粘合剂界面的可用性，这促进了 CoHCP 板的成核。