添加明胶优化仿贝壳TiB2/Al-Cu复合材料的组织和力学性能  

Optimization of the microstructure,mechanical properties,and wear resistance of nacre-inspired TiB2/Al-Cu composites via gelatin addition

作　　者：陈亚丽 林波 聂蒙 胡可 肖华强 CHEN Ya-li;LIN Bo;NIE Meng;HU Ke;XIAO Hua-qiang(School of Mechanical Engineering,Guizhou University,Guiyang 550025,China;Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China;National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals,Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Guangzhou 510650,China)

机构地区：[1]School of Mechanical Engineering,Guizhou University,Guiyang 550025,China [2]Institute of New Materials,Guangdong Academy of Sciences,Guangzhou 510650,China [3]National Engineering Research Center of Powder Metallurgy of Titanium&Rare Metals,Guangdong Provincial Key Laboratory of Metal Toughening Technology and Application,Guangzhou 510650,China

出　　处：《Journal of Central South University》2024年第2期416-430,共15页中南大学学报（英文版）

基　　金：Project(52265043)supported by the National Natural Science Foundation of China;Project(2021A1515010470)supported by the Natural Science Foundation of Guangdong Province,China;Project(ZK2023(014))supported by the Guizhou Provincial Science and Technology Projects,China;Project(YQK[2023]011)supported by the Outstanding Youth Science and Technology Talent Project of Guizhou Province,China。

摘　　要：采用冷冻铸造及压力浸渗制备了TiB_(2)/Al-Cu层状复合材料。研究了明胶含量对复合材料组织和力学性能的影响。同时,分析了其组织、断裂和磨损机理。结果表明,随着明胶添加量的增加,TiB_(2)/Al-Cu复合材料的抗压、抗弯强度和韧性均有所提高。当明胶含量为1.0 wt%时,复合材料具有最佳的力学性能,其抗压强度、抗弯强度、裂纹萌生韧性(KIC)和裂纹扩展韧性(KJC)分别为(625±13)MPa,(626±4)MPa,(22.23±0.2)MPa·m^(1/2)和(54.43±2.4)MPa·m^(1/2)。此外,明胶的加入提高了TiB_(2)/Al-Cu层状复合材料的耐磨性能。力学性能和耐磨性能提高均归因于添加明胶后,陶瓷片层开始弯曲且桥接增多,TiB_(2)/Al-Cu层状复合材料微观结构得到优化。当复合材料受到外部载荷时,增加了形成多裂纹可能性,同时弯曲的陶瓷片层和陶瓷桥接有效地阻碍了金属片层间的剪切流动并抑制了金属的塑性变形,最终提高了复合材料的性能。Nacre-inspired TiB_(2)/Al-Cu composites were prepared by freeze casting and squeeze casting.This study focused on the effect of gelatin content on microstructure,mechanical characteristics,and wear resistance of the composites.The structure formation,as well as the fracture and wear mechanisms of the composites,was analyzed.The results demonstrate that both the compressive and bending strength and the toughness of the TiB_(2)/Al-Cu composites improved with gelatin addition.The composites with 1.0 wt%gelatin content achieved optimal mechanical properties,with a compressive strength,bending strength,crack-initiation toughness(KIC),and crack-growth toughness(KJC)of(625±13)MPa,(626±4)MPa,(22.23±0.2)MPa∙m^(1/2),and(54.43±2.4)MPa∙m^(1/2),respectively.Moreover,the gelatin addition improved the wear properties of the laminated TiB_(2)/Al-Cu composites significantly.The bent ceramic layer and increased ceramic bridging are responsible for the improved strength,toughness,and wear resistance of the TiB_(2)/Al-Cu composites inspired by nacre with gelatin addition,which further increased the potential of multiple cracks and reduced the Al layer’s ability to deform plastically.

关 键 词：仿贝壳技术 TiB2/Al-Cu复合材料 冷冻铸造 挤压铸造 明胶添加 

分 类 号：TB333[一般工业技术—材料科学与工程]