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| Influences of cold deformation and annealing on the microstructures and mechanical properties of in-situ carbon nanosheet/copper composites |
| FAN Leilei1, LIU Ying1,2, YAO Yupeng1, TU Ruibo1, WU Yanxia1, WANG Jian1, JING Lin2, ZHANG Caili3 |
1. School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu 610031, China;
3. Analytical Test Center, Taiyuan University of Technology, Taiyuan 030023, China |
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Abstract The microstructure regulation of the copper matrix constitutes an effective way to overcome the inverse relationship between the strength and plasticity of carbon nanosheet/Cu composites. In this paper, the composites were in-situ synthesized by powder metallurgy technology and subjected to cold-rolling deformation and annealing treatment. The influences of cold-rolling deformation and annealing temperature on the microstructures and mechanical properties of the in-situ synthesized carbon nanosheet/Cu composites and the corresponding mechanism were investigated. The results show that during the rolling process, the grain size of Cu matrix is gradually reduced with the increase of cold-rolling amount, forming a {110}〈113〉 texture, as well as the density of dislocations increase greatly. With the effects of grain refinement, deformation texture and dislocation strengthening, the strength of the carbon nanosheet/Cu composites is significantly enhanced, especially, the composite with the deformation amount of 40% exhibits the most obvious enhancement, the yield strength and tensile strength reaches 332 MPa and 375 MPa, respectively, which are enhanced by 73.8% and 22.1% in comparison with the undeformed composites, however, due to the formation of deformation texture, the plasticity decreases, and the elongation is only maintained at 6.7%. After annealing, there is a slight reduction in the strength of the cold deformed carbon nanosheet/Cu composites but the plasticity restores because of the dislocation recovery or recrystallization of the copper matrix and the more uniform grain orientation. The composite annealed at 200 ℃ exhibits the best matching of strength and plasticity, and the best mechanical properties with the yield strength, tensile strength, and elongation of 284 MPa, 373 MPa, and 10.6%, respectively, the tensile strength is increased by 21.5% compared with the initial state, and its elongation is decreased by only 2.1%.
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Received: 09 October 2024
Published: 08 April 2025
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2025, Vol. 30 
