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通过调整润湿性开发具有高抗损伤性能的仿珍珠贝壳层状2024Al/B4C复合材料
引用本文:汪洋,刘强,张标,张浩谦,金义程,钟兆新,叶健,任宇涵,叶枫,王文.通过调整润湿性开发具有高抗损伤性能的仿珍珠贝壳层状2024Al/B4C复合材料[J].中国有色金属学会会刊,2022,32(4):1105-1118.
作者姓名:汪洋  刘强  张标  张浩谦  金义程  钟兆新  叶健  任宇涵  叶枫  王文
摘    要:为了解决复合材料中B4C陶瓷相难以被金属铝润湿的问题,利用TiH2和B4C的原位反应引入TiB2,进而调节其润湿性和界面结合.通过将熔融合金压力浸渗到冷冻铸造法制备的多孔陶瓷支架中,制备具有层状结构的2024Al/B4C?TiB2复合材料.与2024Al/B4C复合材料相比,加入TiH2后复合材料的抗弯强度和裂纹扩展韧...

关 键 词:生物启发复合材料  冷冻铸造  氢化钛  力学性能  耐损伤性
收稿时间:23 April 2021

Developing nacre-inspired laminate-reticular 2024Al/B4C composites with high damage resistance by adjusting compositional wettability
Affiliation:Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Abstract:To address the issue that B4C ceramics are difficult to be wetted by aluminum metals in the composites, TiB2 was introduced via an in-situ reaction between TiH2 and B4C to regulate their wettability and interfacial bonding. By pressure infiltration of the molten alloy into the freeze-cast porous ceramic skeleton, the 2024Al/B4C–TiB2 composites with a laminate-reticular hierarchical structure were produced. Compared with 2024Al/B4C composite, adding initial TiH2 improved the flexural strength and valid fracture toughness from (484±27) to (665±30) MPa and (19.3±1.5) to (32.7±1.8) MPa·m1/2, respectively. This exceptional damage resistance ability was derived from multiple extrinsic toughening mechanisms including uncracked-ligament bridging, crack branching, crack propagation and crack blunting, and more importantly, the fracture model transition from single to multiple crack propagation. This strategy opens a pathway for improving the wettability and interfacial bonding of Al/B4C composites, and thus produces nacre-inspired materials with optimized damage tolerance.
Keywords:bio-inspired composites  freeze casting  titanium hydride  mechanical properties  damage tolerance
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