仿贝壳ZrB_(2)/Al-Cu层状复合材料的组织与力学性能  

Microstructure and mechanical properties of nacre-inspired ZrB_(2)/Al-Cu layer composites

作　　者：班生涛 成桃 李杰宇 朱劲松 肖华强[1,2] 林波 BAN Shengtao;CHENG Tao;LI Jieyu;ZHU Jinsong;XIAO Huaqiang;LIN Bo(College of Mechanical Engineering,Guizhou University,Guiyang 550025,China;Department of Mechanical Engineering,National University of Singapore,117575,Singapore)

机构地区：[1]贵州大学机械工程学院,贵阳550025 [2]Department of Mechanical Engineering,National University of Singapore,117575,Singapore

出　　处：《中国有色金属学报》2025年第3期852-865,共14页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52265043);贵州省科技计划项目[ZK2023(014)];贵州省优秀青年科技人才项目(YQK[2023]011);贵州大学基金资助项目([2024]03);贵州省科学技术基金资助项目(BQW[2024]011)。

摘　　要：采用冷冻铸造和压力浸渗工艺制备了仿贝壳ZrB_(2)/Al-Cu层状复合材料,研究了复合材料的微观组织、力学性能和断裂机理。结果表明:随着ZrB_(2)体积分数的增加,ZrB_(2)/Al-Cu层状复合材料的准静态抗压强度与抗弯强度增大,但裂纹萌生韧性(K_(IC))和裂纹扩展韧性(K_(JC))降低。30%ZrB_(2)/Al-Cu复合材料的抗压强度和抗弯强度分别为524 MPa和499 MPa,均高于20%ZrB_(2)/Al-Cu复合材料的抗压强度和抗弯强度(分别为494 MPa、417 MPa),但其K_(IC)和K_(JC)(分别为11.0 MPa·m^(1/2)、16.1 MPa·m^(1/2))均低于20%ZrB_(2)/Al-Cu复合材料的K_(IC)和K_(JC)(分别为12.9 MPa·m^(1/2)、23.9 MPa·m^(1/2));在应变率为500 s^(-1)的动态压缩下,30%ZrB_(2)/AlCu复合材料的最大抗压强度为432 MPa,高于20%ZrB_(2)/Al-Cu复合材料的抗压强度408 MPa。所得ZrB_(2)/AlCu层状复合材料的强度和韧性均高于大多数仿贝壳陶瓷/Al复合材料的,这主要是由于ZrB_(2)与Al界面结合良好以及裂纹的偏转和钝化、金属层的撕裂和金属-陶瓷层协同塑性变形等增韧机制。The nacre-inspired ZrB_(2)/Al-Cu layered composites were prepared by freeze casting and pressure infiltration,and their microstructure,mechanical properties and fracture mechanisms were investigated.The results show that,with increasing initial ZrB_(2) concentration,the quasi-static compressive strength and bending strength of the composites increase,while the crack initiation toughness(KIC)and crack-growth toughness(K_(JC))decrease.The compressive strength and bending strength of 30%ZrB_(2)/Al-Cu layer composite are 524 MPa and 499 MPa,respectively,both greater than those of 20%ZrB_(2)/Al-Cu layer composite(494 MPa and 417 MPa).However,KIC and K_(JC) of 30%ZrB_(2)/Al-Cu layer composite are 11.0 MPa∙m^(1/2) and 16.1 MPa∙m^(1/2),respectively,which are lower than those of 20%ZrB_(2)/Al-Cu layer composite(12.9 MPa∙m^(1/2),23.9 MPa∙m^(1/2)).In addition,under dynamic compression at a strain rate of 500 s^(-1),the 30%ZrB_(2)/Al-Cu composite has better compressive strength(432 MPa)compared to the 20%ZrB_(2)/Al-Cu layer composite(compressive strength 408 MPa).The strength and toughness of ZrB_(2)/Al-Cu layer composite are higher than those of most nacre-inspired ceramic/Al composites,mainly attributed to the excellent interfacial bonding between ZrB_(2) and Al and the toughening mechanisms,such as crack deflection and blunting,metal layer tearing and synergistic plastic deformation of metal-ceramic layer.

关 键 词：冷冻铸造 压力浸渗 仿贝壳ZrB_(2)/Al-Cu层状复合材料 断裂行为 动态加载 

分 类 号：TB333[一般工业技术—材料科学与工程]