碳纳米管-Ti3AlC2/AZ91D复合材料的微观组织及力学性能  

Micro-morphology and mechanical properties of carbon nanotubes-Ti3AlC2/AZ91D composites

作　　者：孙伟[1] 柏跃磊[2] 张强[1] 刘玉坤[1] 朱春城[1] SUN Wei;BAI Yuelei;ZHANG Qiang;LIU Yukun;ZHU Chuncheng(School of Chemistry and Chemical Engineering,Harbin Normal University,Harbin 150025,China;National Key Laboratory of Science and Technology on Advanced Composites in Special Environments,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨师范大学化学与化工学院,哈尔滨150025 [2]哈尔滨工业大学特种环境复合材料技术国防科技重点实验室,哈尔滨150001

出　　处：《复合材料学报》2020年第7期1649-1656,共8页Acta Materiae Compositae Sinica

基　　金：黑龙江省自然科学基金重点项目(ZD2017011);国家自然科学基金(51572064);国防基础科研计划(JCKYS2019603C005)。

摘　　要：采用化学镀铜的方法对增强相碳纳米管(CNTs)和Ti3AlC2进行表面改性,热压烧结制备了CNTs-Ti3AlC2/AZ91D复合材料,研究了其微观组织和力学性能的变化及增强机制。结果表明:CNTs-Ti3AlC2/AZ91D复合材料内部主要物相为CNTs、Ti3AlC2、Mg和Al12Mg17,增强相均匀分布在基体内,在增强相与基体的界面处存在U相(MgAlCu),使二者界面结合良好。当增强相CNTs和Ti3AlC2含量分别为1wt%和25wt%时,较镁合金AZ91D,CNTs-Ti3AlC2/AZ91D复合材料的弹性模量、拉伸强度、屈服强度和延伸率分别提高了120.30%、25.72%、126.50%和36.84%,弯曲强度和压缩强度分别为337.92 MPa和436.27 MPa。CNTs-Ti3AlC2/AZ91D复合材料的断裂方式表现为脆性断裂,其强化机制主要为热配错强化、Orowan强化和细晶强化机制。Carbon nanotubes(CNTs)and Ti3AlC2 reinforced phase was surface modified by electroless copper plating.The CNTs-Ti3AlC2/AZ91D composites was prepared by hot pressing(HP)sintering.The microstructure,mechanical properties and strengthening mechanism of the CNTs-Ti3AlC2/AZ91D composites were studied.The results indicate that the main physical phases in the CNTs-Ti3AlC2/AZ91D composite are CNTs,Ti3AlC2,Mg and Al12Mg17,and the reinforced phase is uniformly distributed in the matrix.There is a U phase(MgAlCu)at the interface between the reinforced phase and the matrix,which can make the interface of the two well combined.When the reinforced phase content is CNTs(1 wt%)and Ti3AlC2(25 wt%),compared with magnesium alloyAZ91D,the elasticity modulus,tensile strength,yield strength and elongation of the CNTs-Ti3AlC2/AZ91D composites are increased by 120.30%,25.72%,126.50%and 36.84%,respectively,and the flexural strength and compression strength are 337.92 MPa and 436.27 MPa.The fracture mode of the CNTs-Ti3AlC2/AZ91D composites is brittle fracture,and the strengthening mechanism is mainly thermal mismatch strengthening,Orowan strengthening and fine grain strengthening.

关 键 词：热压烧结 TI3ALC2 碳纳米管(CNTs) 镀铜 力学性能 镁合金 

分 类 号：TB331[一般工业技术—材料科学与工程]