Influence of Transition Metals Ti and Co on Interfacial Microstructure and Strength of Copper-graphene Composites
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摘要: 采用基体合金化和粉末冶金的方法在铜—石墨烯复合材料中分别引入过渡金属元素Ti和Co,通过拉伸测试,对比Ti和Co对铜—石墨烯复合材料强度的影响,并使用扫描电镜(SEM)、透射电镜(TEM)和拉曼光谱表征微观组织和铜/石墨烯界面结构,结果表明:掺Ti的复合材料界面上生成大量纳米TiC颗粒,不增加石墨烯缺陷的同时促进界面结合,材料强度从223 MPa提升至256 MPa;掺Co复合材料的界面出现无定形碳,增加了石墨烯缺陷,不利于其发挥增强相和传递界面载荷的作用,导致强度从223 MPa降低至192 MPa。Abstract: Transition metals Ti and Co were separately introduced into copper-graphene composites by matrix alloying and powder metallurgy methods.The effects of Ti and Co on the strength of copper-graphene composites were compared by tensile test.The microstructure and interface structure of copper/graphene composites were characterized by scanning electron microscopy（SEM）,transmission electron microscopy（TEM）and Raman spectroscopy.With addition of Ti,a large number of nano TiC particles were formed on the interface,which promoted the interface bonding without increasing graphene defects,and the tensile strength increased from 223 MPa to 256 MPa.Nevertheless,amorphous carbon appeared at the interface of Co doped composites.It increased graphene defects and was not conducive to play the role of strengthening phase and transferring interface load,resulting in the strength decreased from 223 MPa to 192 MPa.
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Key words:
- copper/graphene composites /
- Ti /
- Co /
- matrix alloying /
- powder metallurgy /
- interface structure /
- strength
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