Investigation on microstructural, mechanical and electrochemical properties of aluminum composites reinforced with graphene nanoplatelets  

作　　者：Muhammad Rashad Fusheng Pan Zhengwen Yu Muhammad Asif Han Lin Rongjian Pan 

机构地区：[1]College of Materials Science and Engineering, Chongqing University [2]National Engineering Research Center for Magnesium Alloys, Chongqing University [3]Chongqing Academy of Science and Technology [4]School of Materials Science and Engineering, Dalian University of Technology

出　　处：《Progress in Natural Science:Materials International》2015年第5期460-470,共11页自然科学进展·国际材料（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 50725413);the Ministry of Science and Technology of China (MOST) (Nos. 2010DFR50010 and 2011FU125Z07);Chongqing Science and Technology Commission, Chongqing People’s Municipal Government (CSTC2013JCYJC60001)

摘　　要：In present study,the microstructure,mechanical and electrochemical properties of aluminum-graphene nanoplatelets(GNPs) composites were investigated before and after extrusion.The contents of graphene nanoplatelets(GNPs) were varied from 0.25 to 1.0 wt.%in aluminum matrix.The composites were fabricated thorough powder metallurgy method,and the experimental results revealed that Al-0.25%GNPs composite showed better mechanical properties compared with pure Al,Al-0.50%GNPs and Al-0.1.0%GNPs composites.Before extrusion,the Al-0.25%GNPs composite showed ~13.5%improvement in ultimate tensile strength(UTS) and ~50%enhancement in failure strain over monolithic matrix.On the other hand,Al-0.50%GNPs and Al-0.1.0%GNPs composites showed the tensile strength lower than monolithic matrix.No significant change was observed in 0.2%yield strength(YS) of the composites.However,the extruded materials showed different trends.The0.2%YS of composites increased with increase in GNPs filler weight fractions.Surprisingly,UTS of composites with 0.25 and 0.50%GNPs was lower than monolithic matrix.The failure strain of the baseline matrix was enhanced by ~46%with 0.25%graphene nanoplatelets.The superior mechanical properties(in terms of failure strain) of the Al-0.25%GNPs composite maybe attributed to 2-D structure,high surface area and curled nature of graphene.In addition,the corrosion resistance of pure Al and its composites reinforced with 0.5 and 1.0 wt%GNPs was also investigated.It was found that the corrosion rate increased considerably by the presence of GNPs.In present study, the microstructure, mechanical and electrochemical properties of aluminum-graphene nanoplatelets (GNPs) composites were investigated before and after extrusion. The contents of graphene nanoplatelets (GNPs) were varied from 0.25 to 1.0 wt.% in aluminum matrix. The composites were fabricated thorough powder metallurgy method, and the experimental results revealed that A1-0.25%GNPs composite showed better mechanical properties compared with pure A1, A1-0.50%GNPs and A1-0.1.0%GNPs composites. Before extrusion, the A1-0.25% GNPs composite showed similar to 13.5% improvement in ultimate tensile strength (UTS) and similar to 50% enhancement in failure strain over monolithic matrix. On the other hand, A1-0.50%GNPs and A1-0.1.0%GNPs composites showed the tensile strength lower than monolithic matrix. No significant change was observed in 0.2% yield strength (YS) of the composites. However, the extruded materials showed different trends. The 0.2%YS of composites increased with increase in GNPs filler weight fractions. Surprisingly, UTS of composites with 0.25 and 0.50% GNPs was lower than monolithic matrix. The failure strain of the baseline matrix was enhanced by similar to 46% with 0.25% graphene nanoplatelets. The superior mechanical properties (in terms of failure strain) of the A1-0.25%GNPs composite maybe attributed to 2-D structure, high surface area and curled nature of graphene. In addition, the corrosion resistance of pure A1 and its composites reinforced with 0.5 and 1.0 wt% GNPs was also investigated. It was found that the corrosion rate increased considerably by the presence of GNPs. (C) 2015 Chinese Materials Research Society. Production and hosting by Elsevier B.V.

关 键 词：Aluminum–graphene composites Powder METALLURGY Corrosion TENSILE property 

分 类 号：TB333[一般工业技术—材料科学与工程]