Bioinspired, Graphene/Al2O3 Doubly Reinforced Aluminum Composites with High Strength and Toughness,Nano Letters

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Bioinspired, Graphene/Al2O3 Doubly Reinforced Aluminum Composites with High Strength and Toughness
Nano Letters ( IF 9.6 ) Pub Date : 2017-10-06 00:00:00 , DOI: 10.1021/acs.nanolett.7b03308
Yunya Zhang ₁ , Xiaodong Li ₁

Affiliation

Nacre, commonly referred to as nature’s armor, has served as a blueprint for engineering stronger and tougher bioinspired materials. Nature organizes a brick-and-mortar-like architecture in nacre, with hard bricks of aragonite sandwiched with soft biopolymer layers. However, cloning nacre’s entire reinforcing mechanisms in engineered materials remains a challenge. In this study, we employed hybrid graphene/Al₂O₃ platelets with surface nanointerlocks as hard bricks for primary load bearer and mechanical interlocking, along with aluminum laminates as soft mortar for load distribution and energy dissipation, to replicate nacre’s architecture and reinforcing effects in aluminum composites. Compared with aluminum, the bioinspired, graphene/Al₂O₃ doubly reinforced aluminum composite demonstrated an exceptional, joint improvement in hardness (210%), strength (223%), stiffness (78%), and toughness (30%), which are even superior over nacre. This design strategy and model material system should guide the synthesis of bioinspired materials to achieve exceptionally high strength and toughness.

中文翻译：

具有生物强度的高强度和韧性石墨烯/ Al ₂ O ₃双增强铝复合材料

珍珠母通常被称为大自然的装甲，已成为设计更坚固的生物启发性材料的蓝图。大自然在珍珠质中组织了一种砖瓦般的建筑，,石的坚硬砖块夹着柔软的生物聚合物层。然而，将珍珠母的整个增强机制克隆到工程材料中仍然是一个挑战。在这项研究中，我们采用具有表面纳米互锁的混合石墨烯/ Al ₂ O ₃薄片作为硬砖，用于主要的承载和机械互锁，以及将铝层压板作为软质砂浆，用于负载分配和能量消散，以复制珍珠母的结构和增强效果。铝复合材料。与铝相比，生物启发的石墨烯/ Al ₂ O ₃双重增强铝复合材料在硬度（210％），强度（223％），刚度（78％）和韧性（30％）方面表现出卓越的联合改进，甚至比珍珠母还优越。这种设计策略和模型材料系统应指导生物启发材料的合成，以实现极高的强度和韧性。

更新日期：2017-10-07

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