Effect of Ball Milling on the Defeat of Few-Layer Graphene and Properties of Copper Matrix Composites
来源期刊：Acta Metallurgica Sinica2014年第5期
论文作者：Ye Cui Lidong Wang Bin Li Guojian Cao Weidong Fei
文章页码：937 - 943
摘 要：Graphene-reinforced copper composites recently have attracted more attention, since they exhibited excellent mechanical properties and could be used widely in many fields. Few-layer graphene（FLG） and copper powder were mixed by ball milling to produce homogeneous composite powders. Then, FLG-reinforced copper composites（FLG/Cu） were fabricated by spark plasma sintering（SPS） using the composite powders with a FLG volume fraction of 2.4 vol%. The effects of the rotating speed and the time of ball milling were analyzed based on the microstructure evolution and properties of the FLG/Cu composites. Obvious strengthening effect of FLG was found for the composites, and the conductance of the composite reaches 70.4% of IACS. The yield strength of the composite produced by ball milling at a speed of 100 r/min for 4 h is 376 MPa, which is 2.5 times higher than that of copper and higher than that of copper composite enhanced by 5 vol% CNTs（360 MPa）. The defects produced in FLG with the increase of rotating speed and time could reduce the mechanical and conductive properties of the composites.
Ye Cui1，Lidong Wang1，Bin Li1，Guojian Cao2，Weidong Fei1,3
1. School of Materials Science and Engineering,Harbin Institute of Technology2. School of Materials Science and Engineering,Harbin University of Science and Technology3. School of Mechanical Engineering,Qinghai University
摘 要：Graphene-reinforced copper composites recently have attracted more attention, since they exhibited excellent mechanical properties and could be used widely in many fields. Few-layer graphene（FLG） and copper powder were mixed by ball milling to produce homogeneous composite powders. Then, FLG-reinforced copper composites（FLG/Cu） were fabricated by spark plasma sintering（SPS） using the composite powders with a FLG volume fraction of 2.4 vol%. The effects of the rotating speed and the time of ball milling were analyzed based on the microstructure evolution and properties of the FLG/Cu composites. Obvious strengthening effect of FLG was found for the composites, and the conductance of the composite reaches 70.4% of IACS. The yield strength of the composite produced by ball milling at a speed of 100 r/min for 4 h is 376 MPa, which is 2.5 times higher than that of copper and higher than that of copper composite enhanced by 5 vol% CNTs（360 MPa）. The defects produced in FLG with the increase of rotating speed and time could reduce the mechanical and conductive properties of the composites.
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