Abstract：Graphene nanoflakes (GNFs) reinforced aluminum matrix composites were prepared by compressing-sintering-hot extrusion process, and their compressive properties were tested. The results show that GNFs/Al composites are high strain rate sensitive materials. When the strain rate increases from 10-3s-1 to 3×103s-1, the strength of the composites increases obviously. However, when the strain rate further increases to 5×103s-1, the strength of the composites declines a little due to the internal thermal softening of the material. Dynamic recrystallization occurs in the matrix of the composites after dynamic compression, and the higher the strain rate is, the more significant the dynamic recrystallization is. At the same time, the enhanced phase GNFs remain intact and bonded with matrix in atom scale while undergo a distorted deformation. Therefore, the plasticity of graphene reinforced aluminum matrix composites under dynamic compression is excellent.
[1] TJONG S C,LAU K C. Tribological behaviour of SiC particle-reinforced copper matrix composites[J]. Materials Letters,2000, 43(5/6):274-280.
[2] WEI J N,WANG D Y,XIE W J,et al. Effects of macroscopic graphite particulates on the damping behavior of Zn-Al eutectoid alloy[J]. Physics Letters A,2007,366(1/2):134-136.
[3] THAKUR S K,GAN T K,GUPTA M. Development and chara-cterization of magnesium composites containing nano-sized silicon carbide and carbon nanotubes as hybrid reinforcements[J]. Journal of Materials Science,2007,42(24):10040-10046.
[4] TUN K S,GUPTA M. Effect of extrusion ratio on microstructure and mechanical properties of microwave-sintered magnesium and Mg/Y2O3,nanocomposite[J]. Journal of Materials Science,2008,43(13):4503-4511.
[5] ⅡJIMA S. Helical microtubules of graphitic carbon[J]. Nature,1991,354(6348):56-58.
[6] GEIM A K. Graphene:status and prospects[J]. Science,2009,324(5934):1530-1534.
[7] LEE C,WEI X,KYSAR J W,et al. Measurement of the elastic properties and intrinsic strength of monolayer graphene[J]. Science, 2008,321(5887):385-388.
[8] 管仁国,连超,赵占勇,等. 石墨烯铝基复合材料的制备及其性能[J]. 稀有金属材料与工程, 2012,41(增刊2):607-611. GUAN R G,LIAN C,ZHAO Z Y,et al. Study on preparation of graphene and Al-graphene composite[J]. Rare Metal Materials and Engineering,2012,41(Suppl 2):607-611.
[9] WANG J,LI Z,FAN G,et al. Reinforcement with graphene nanosheets in aluminum matrix composites[J]. Scripta Materi-alia, 2012, 66(8):594-597.
[10] LI Z,GUO Q,LI Z Q,et al. Enhanced mechanical properties of graphene (reduced graphene oxide)/aluminum composites with a bioinspired nanolaminated structure[J]. Nano Letters,2015,15(12):8077-8083.
[11] LI J L, XIONG Y C,WANG X D,et al. Microstructure and tensile properties of bulk nanostructured aluminum/graphene composites prepared via cryomilling[J]. Materials Science and Engineering:A,2015,626:400-405.
[12] LI G, XIONG B W. Effects of graphene content on microstruc-tures and tensile property of graphene-nanosheets/aluminum composites[J]. Journal of Alloys and Compounds,2017,697:31-36.
[13] FENG S W, GUO Q,LI Z, et al. Strengthening and toughening mechanisms in graphene-Al nanolaminated composite micro-pillars[J]. Acta Materialia,2017,125:98-108.
[14] 燕绍九,杨程,洪起虎,等. 石墨烯增强铝基纳米复合材料的研究[J]. 材料工程, 2014(4):1-6. YAN S J,YANG C,HONG Q H,et al. Research of graphene-reinforced aluminum matrix nanocomposites[J]. Journal of Materials Engineering,2014(4):1-6.
[15] JEON C H, JEONG Y H,SEO J J,et al. Material properties of graphene/aluminum metal matrix composites fabricated by friction stir processing[J]. International Journal of Precision Engineering and Manufacturing,2014,15(6):1235-1239.
[16] BASTWROS M,KIM G Y,ZHU C,et al. Effect of ball milling on graphene reinforced Al6061 composite fabricated by semi-solid sintering[J]. Composites Part B:Engineering,2014,60:111-118.
[17] KUMAR H G P,XAVIOR M A. Processing and characteriz-ation of Al 6061-graphene nanocomposites[J]. Materials Today:Proceedings,2017,4(2):3308-3314.
[18] LIU G,ZHAO N Q,SHI C S, et al. In-situ synthesis of grap-hene decorated with nickel nanoparticles for fabricating reinforced 6061Al matrix composites[J].Materials Science and Engineering:A,2017,699:185-193.
[19] TIAN W M,LI S M,WANG B, et al. Graphene-reinforced alu-minum matrix composites prepared by spark plasma sintering[J]. International Journal of Minerals,Metallurgy,and Materials,2016,23(6):723-729.
[20] REN Y, WANG F C, TAN C W, et al. Shock-induced mech-anical response and spall fracture behavior of an extra-low interstitial grade Ti-6Al-4V alloy[J]. Materials Science and Engineering:A,2013,578:247-255.
[21] HONG S I,GRAY G T Ⅲ,LEWANDOWSKI J J. Dynamic deformation behavior of Al-Zn-Mg-Cu alloy matrix composites reinforced with 20 Vol.% SiC[J]. Acta Metallurgica et Materialia,1993,41(8):2337-2351.
[22] TAN Z H,PANG B J,GAI B Z,et al. The dynamic mechanical response of SiC particulate reinforced 2024 aluminum matrix composites[J]. Materials Letters,2007,61(23):4606-4609.
[23] VAIDYA R U,SONG S G,ZUREK A K. Dynamic mechanical response and thermal expansion of ceramic particle reinforced aluminium 6061 matrix composites[J]. Philosophical Magazine A,1994,70(5):819-836.
[24] CAO F H, TIAN S Y,WANG J J,et al. Damage analysis and compression properties of aluminum-oxide particle reinforced pure aluminum at high rate of deformation[J]. Journal of Ningbo University(NSEE),2003,16(4):454-461.
[25] YADAV S, CHICHILI D R,RAMESH K T. The mechanical response of a 6061-T6 Al/Al2O3, metal matrix composite at high rates of deformation[J]. Acta Metallurgica et Materialia,1995,43(12):4453-4464.
[26] PERNG C C,HWANG J R,DOONG J L. High strain rate tensile properties of an (Al2O3, particles)-(Al alloy 6061-T6) metal matrix composite[J]. Materials Science and Engineering:A,1993,171(1/2):213-221.
[27] LIU X Q,TAN C W,ZHANG J,et al. Correlation of adiabatic shearing behavior with fracture in Ti-6Al-4V alloys with different microstructures[J]. International Journal of Impact Engineering,2009,36(9):1143-1149.
[28] 王礼立,胡时胜. 铝合金LF6R和纯铝L4R在高应变率下的动态应力应变关系[J]. 固体力学学报,1986(2):163-166. WANG L L,HU S S. Dynamic stress-strain relations of Al alloy LF6R and Al L4R under high strain rates[J]. Acta Mechanica Solida Sinica,1986(2):163-166.
[29] BAILEY J E,HIRSCH P B. The recrystallization process in some polycrystalline metals[J]. Proceedings of the Royal Society of London Series A-Mathematical and Physical Sciences,1962,267(1328):11-30.
[30] HU H. Recovery and recrystallization of metals[M]. New York,US:Interscience Publishing,1963:311-361.
[31] CAO D F,SHE W C,LIU L S,et al. Effect of particle size on the dynamic mechanical behaviour and deformed microstructure of SiCp/Al composites[C]//IOP Conference Series:Materials Science and Engineering. Bristol,UK:IOP Publishing Ltd,2011:202014.
2019, Vol. 47 
