Abstract Conventional Laves phase is extremely brittle at room temperature. However, through a systematic study, we showed that the quinary Co-Cr-Fe-Ni-Nb Laves phase in a eutectic high entropy alloy (EHEA) can be plastically deformed at room temperature when its size is refined below 200 nm. Based on our current results, we propose a general micromechanical model that not only explains the suppression of cracks in the high entropy Laves phase but also enables the extraction of its fracture toughness even when the high entropy Laves phase deforms and cracks in a dual-phase microstructure.

中文翻译：

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双相共晶组织中亚微米级高熵金属间化合物的脆性断裂规避

摘要 常规 Laves 相在室温下极脆。然而，通过系统研究，我们发现共晶高熵合金 (EHEA) 中的五元 Co-Cr-Fe-Ni-Nb Laves 相在室温下细化至 200 nm 以下时可发生塑性变形。基于我们目前的结果，我们提出了一个通用的微观力学模型，它不仅解释了高熵 Laves 相中裂纹的抑制，而且即使在高熵 Laves 相在双相中变形和裂纹时也能提取其断裂韧性微观结构。