CNTs/Mg-9Al复合材料微观组织、力学及导热性能  

Microstructure,mechanical and thermal properties of CNTs/Mg-9Al composites

作　　者：李淑波[1] 侯江涛 孟繁婧 刘轲[1] 王朝辉[1] 杜文博[1] LI Shubo;HOU Jiangtao;MENG Fanjing;LIU Ke;WANG Zhaohui;DU Wenbo(Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China;The 38^(th)Research Institute of China Electronics Technology Group Corporation,Hefei 230088,China)

机构地区：[1]北京工业大学材料与制造学部,北京100124 [2]中国电子科技集团公司第三十八研究所,合肥230088

出　　处：《材料工程》2023年第1期26-35,共10页Journal of Materials Engineering

基　　金：国家重点研发项目(2016YFB0301101)。

摘　　要：研究了CNTs的加入对Mg-9Al镁基复合材料时效行为的影响,探讨了时效处理过程中微观组织、力学性能及导热性能的演变规律。结果表明:添加的CNTs增大了基体合金中铝元素的固溶度,并在时效过程中限制晶界的迁移,在二者共同作用下,促进基体中连续β-Mg_(17)Al_(12)相的析出,且随着CNTs含量的增加,连续析出的比例增大;与基体呈共格关系的杆状连续析出相能够有效地阻碍位错运动,提高复合材料的力学性能,其中峰时效态0.4CNTs/Mg-9Al复合材料的屈服强度、抗拉强度、热扩散系数和热导率分别为275 MPa,369 MPa,34.5 mm^(2)/s和68.4 W/(m·K),相较于时效前Mg-9Al合金分别提升了17%,23%,43%和45%。The effect of carbon nanotubes(CNTs)on the aging behavior of Mg-9Al matrix composites was studied,and the evolution of microstructures,mechanical properties and thermal conductivity of composites during the aging treatment were discussed.Results show that the addition of CNTs increases the solid solubility of Al in Mg matrix and limited the migration of grain boundaries during the aging process,which can promote the formation of continuous precipitated phases β-Mg_(17)Al_(12)in CNTs/Mg-9Al composites.The rod-shaped continuous precipitates in coherent relationship with Mg matrix can effectively hinder the dislocation movement,which can improve the mechanical properties of the composites.Besides,the reduction of solid solution Al atoms during aging process and the addition of CNTs can improve the thermal conductivity of the composites.The property evaluation indicates that the tensile yield strength,ultimate tensile strength,diffusivity and thermal conductivity of peak-aged 0.4CNTs/Mg-9Al composite are 275 MPa,369 MPa,34.5 mm^(2)/s and 68.4 W/(m·K)respectively,showing 17%,23%,43% and 45% increasing in comparison with those of Mg-9Al before aging.

关 键 词：碳纳米管 镁基复合材料 时效处理 力学性能 热导率 

分 类 号：TB333[一般工业技术—材料科学与工程]