Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    Special 3    December 2012

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Improvement of mechanical properties of Sn-58Bi alloy with multi-walled carbon nanotubes
HE Peng1, Lü Xiao-chun1, LIN Tie-song1, LI Hai-xin1, AN Jing2, MA Xin3, FENG Ji-cai1, ZHANG Yan4, LI Qi4

1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;
2. Department of Materials Science and Engineering, Shenzhen Graduate School, Harbin

Abstract:Carbon nanotubes (CNTs) reinforced Sn-58Bi composites were successfully fabricated through ball-milling method and low temperature melting process. The influence of multi-walled carbon nanotubes (MWCNTs) on the mechanical strength and ductility of Sn-58Bi lead-free alloy was studied. The mechanical test results show that the bending strength of Sn-58Bi-0.03CNTs (mass fraction, %) composite is increased by 10.5% than that of the Sn-58Bi alloy, which can be attributed to the reduction of Sn-rich segregation and the grain refinement. The toughness of Sn-58Bi-0.03CNTs composite is increased by 48.9% than that of the matrix materials. It is indicated that the influence of CNTs on the strength of Sn-58Bi-xCNTs composite is insignificant. In addition, the fracture mechanism of CNTs reinforced Sn-Bi composite was analyzed. The corresponding fracture surface comparison between the Sn-58Bi-0.03CNTs composite and the monolithic Sn-58Bi alloy was made to identify the influence of CNTs on the fracture behavior and the reinforcing effect of CNTs.

 

Key words: carbon nanotubes; metal-matrix composites; mechanical properties; fracture mechanism

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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