Hollow micro/nanolattices have emerged in recent years as a premium solution compared to conventional foams or aerogels for mechanically robust lightweight structures. However, existing hollow metallic micro/nanolattices often cannot exhibit high toughness due to the intrinsic brittleness from localized strut fractures, limiting their broad applications. Here, we report the development of hollow CoCrNi medium-entropy alloy (MEA) nanolattices, which exhibit high specific energy absorption (up to 25 J g⁻¹) and resilience (over 90% recoverability) by leveraging size-induced ductility and rationally engineered MEA microstructural defects. This strategy provides a pathway for the development of ultralight, damage-resistant metallic metamaterials for a myriad of structural and functional applications.

与传统的泡沫或气凝胶相比，中空的微/纳醇材料近年来已成为一种优质解决方案，可用于机械坚固的轻质结构。但是，由于局部支杆断裂带来的固有脆性，现有的中空金属微/纳诺织物通常不能表现出高韧性，从而限制了它们的广泛应用。在这里，我们报告了中空CoCrNi中熵合金（MEA）纳米晶格的发展，该纳米晶格通过利用尺寸诱导的延展性和合理设计而表现出高的比能吸收（高达25 J g ^-1）和弹性（超过90％的可恢复性）。 MEA的微结构缺陷。该策略为开发用于多种结构和功能应用的超轻，耐损坏的金属超材料提供了一条途径。