Effect of Gr Content and Hot Extrusion on Tensile Properties of (Nano-SiCp+Gr)/Cu Composites Fabricated by Powder Metallurgy

doi:10.1007/s12204-012-1341-6

Abstract

Abstract: Novel hybrid Cu matrix composites reinforced by graphite (Gr) particle with volume fraction of 5%— 15% and nano-SiC particle (nano-SiCp) with volume fraction of 3% have been prepared by powder metallurgy. The results show that Gr and nano-SiCp distribute uniformly in the Cu matrix. With increasing the volume fraction of Gr, the tensile strength of the composites decreases from 114 to 51MPa and the elastic modulus decreases from 75 to 60GPa. Compared with the sintered composites, the tensile properties including elastic modulus, tensile strength, yield strength and tensile elongation of the hot-extruded (nano-SiCp+Gr)/Cu composites are improved greatly due to higher relative density of the composites and more uniform distribution of Gr and nano-SiCp, in addition to finer grain size of the matrix as a result of dynamic recovery and recrystallization which occur during hot extrusion process.

Key words: Cu composites| microstructure| properties| graphite| nano-SiC particle (nano-SiCp)

摘要： Novel hybrid Cu matrix composites reinforced by graphite (Gr) particle with volume fraction of 5%— 15% and nano-SiC particle (nano-SiCp) with volume fraction of 3% have been prepared by powder metallurgy. The results show that Gr and nano-SiCp distribute uniformly in the Cu matrix. With increasing the volume fraction of Gr, the tensile strength of the composites decreases from 114 to 51MPa and the elastic modulus decreases from 75 to 60GPa. Compared with the sintered composites, the tensile properties including elastic modulus, tensile strength, yield strength and tensile elongation of the hot-extruded (nano-SiCp+Gr)/Cu composites are improved greatly due to higher relative density of the composites and more uniform distribution of Gr and nano-SiCp, in addition to finer grain size of the matrix as a result of dynamic recovery and recrystallization which occur during hot extrusion process.

关键词: Cu composites| microstructure| properties| graphite| nano-SiC particle (nano-SiCp)

CLC Number:

TG 146

WANG Gui-songa,b* (王桂松), LUO Yanga (罗阳), LIU Bao-xia (刘宝玺),YIN Chenga (尹成), GENG Lina (耿林), HUANG Yu-dongb (黄玉东). Effect of Gr Content and Hot Extrusion on Tensile Properties of (Nano-SiCp+Gr)/Cu Composites Fabricated by Powder Metallurgy[J]. Journal of shanghai Jiaotong University (Science), 2012, 17(6): 658-662.

References

[1] Tjong S C, Lau K C. Abrasive wear behavior of TiB2 particle-reinforced copper matrix composites [J]. Materials Science and Engineering A, 2000, 282(1-2): 183-186.
[2] Celebiefe G, Yener T, Altinsoy I, et al. The effect of sintering temperature on some properties of Cu-SiC composite [J]. Journal of Alloys and Compounds, 2011,509(20): 6036-6042.
[3] Kato H,Takama M, Iwai Y, et al. Wear and mechanical properties of sintered copper-tin composites containing graphite or molybdenum disulfide [J]. Wear,2003, 255(1-6): 573-538.
[4] Chandrakanth R G, Rajkumar K, Aravindan S. Fabrication of copper-TiC-graphite hybrid metal matrix composites through microwave processing [J].The International Journal of Advanced Manufacturing Technology, 2010, 48(5-8): 645-653.
[5] Ramesh C S, Noor Ahmed R, Mujeebu M A, et al. Development and performance analysis of novel cast copper-SiC-Gr hybrid composites [J]. Materials and Design, 2009, 30(6): 1957-1965.
[6] Riaz Ahamed A, Asokan P, Aravindan S. EDM of hybrid Al-SiCp-B4Cp and Al-SiCp-Glassp MMCs [J].The International Journal of Advanced Manufacturing Technology, 2009, 44(5-6): 520-528.
[7] Cho K H, Hong U S, Lee K S, et al. Tribological properties and electrical signal transmission of coppergraphite composites [J]. Tribology Letters, 2007, 27(3):301-306.
[8] Zhan Y Z, Zhang G D. Friction and wear behavior of copper matrix composites reinforced with SiC and graphite particles [J]. Tribology Letters, 2004, 17(1):91-98.
[9] Uecker A. Lead-free carbon brushes for automotive starters [J]. Wear, 2003, 255: 1286-1290.
[10] Kestursatya M, Kim J K, Rohatgi P K. Wear performance of copper-graphite composite and a leaded copper alloy [J]. Materials Science and Engineering A,2003, 339(1-2): 150-158.
[11] Moustafa S F, El-Badry S A, Sanad A M, et al. Friction and wear of copper-graphite composites made with Cu-coated and uncoated graphite powders [J].Wear, 2002, 253: 699-710.
[12] Zhao H J, Liu L, Wu Y T, et al. Investigation on wear and corrosion behavior of Cu-graphite composites prepared by electroforming [J]. Composites Science and Technology, 2007, 67(6): 1210-1217.
[13] Chen B M, Bi Q L, Yang J, et al. Tribological properties of solid lubricants (graphite, h-BN) for Cu-based P/M friction composites [J]. Tribology International, 2008, 41(12): 1145-1152.
[14] Fang X F, Dahl W. Strain hardening of steels at large strain deformation. Part I. Relationship between strain hardening and microstructures of b.c.c steels [J].Materials Science and Engineering A, 1995, 203(1-2):14-25.
[15] Yoshida F, Uemori T. A model of large-strain cyclic plasticity describing the Bauschinger effect and workhardening stagnation [J]. International Journal of Plasticity, 2002, 18(5-6): 661-686.
[16] Corbin S F, Wilkinson D S, Embury J D. The Bauschinger effect in a particulate reinforced Al alloy [J]. Materials Science and Engineering A, 1996, 207(1-2): 1-11.