This study introduces a novel heterogeneity-mitigating strategy to enhance the strength-ductility synergy in precipitation-strengthened FCC/B2 dual-phase high-entropy alloys (DP-HEAs), addressing the challenge of strain localization and interfacial cracking between phases. While traditional FCC/B2 DP-HEAs benefit from heterogeneous deformation-induced effects, increased strength in precipitation-strengthened FCC/B2 DP-HEAs often leads to premature failure due to strain localization. Traditional approaches, such as microstructure refinement and morphological regulation, often fall short, especially in alloys with significant phase volume fraction differences and precipitation. By employing precise microstructural regulation, the heterogeneity-mitigating strategy achieves a twofold increase in ductility and a significant enhancement in strength. The micro-digital image correlation technique elucidates the role of dual-phase heterogeneity in interfacial strain partitioning, while nanoindentation and simulations reveal the intrinsic link between reduced heterogeneity and improved deformation compatibility. This approach overcomes the limitations of existing methods, offering a new pathway for the synergistic enhancement of strength and ductility in precipitation-strengthened FCC/B2 DP-HEAs with differing phase properties and volume fractions.

中文翻译：

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通过减轻沉淀强化 FCC/B2 双相高熵合金的异质性来促进强度-延展性协同作用


本研究引入了一种新的异质性缓解策略，以增强沉淀强化 FCC/B2 双相高熵合金 （DP-HEA） 的强度-延展性协同作用，解决了应变定位和相间界面开裂的挑战。虽然传统的 FCC/B2 DP-HEA 受益于异质变形诱导效应，但沉淀强化 FCC/B2 DP-HEA 的强度增加通常会导致应变定位导致过早失效。传统方法（如微观结构细化和形态调控）往往达不到要求，尤其是在具有显著相体积分数差异和沉淀的合金中。通过采用精确的微观结构调节，异质性缓解策略实现了延展性的两倍增长和强度的显著提高。微数字图像相关技术阐明了双相异质性在界面应变分配中的作用，而纳米压痕和模拟揭示了减少异质性与提高变形兼容性之间的内在联系。这种方法克服了现有方法的局限性，为协同增强具有不同相特性和体积分数的沉淀强化 FCC/B2 DP-HEA 的强度和延展性提供了一条新途径。