Preparation and mechanical properties of in-situ carbon nanotube/aluminum composites
WANG Lei1, YIN Hua1, XU Run2, TAN Zhanqiu2, FAN Genlian2, LI Zhiqiang2, ZHANG Di2
1. Integration Platform Department, CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130062, China; 2. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract:The carbon nanotube/aluminum (CNT/Al) composites were fabricated by flake powder metallurgy, and investigated the mechanical properties. First, flaky CNT/Al composite powders were prepared by in-situ growth of CNTs on the submicron sized Al flakes with the polymer pyrolysis chemical vapor deposition (CVD) methods. Then the flaky CNT/Al composite powders were compacted, sintered and extruded to fabricate dense bulk CNT/Al composites. The results show that, Compared with the Al matrices, the tensile strength and modulus of the 1.5%CNT/Al composites are increased by 18.5% and 23.7%, while the tensile strength and modulus of the 3%CNT/Al composites are increased by 31.4% and 74.1%. However, their tensile elongations decrease to 4.96% and 1.5%, respectively, which may be owning to the grain refinement and dislocation strengthening mechanisms.
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