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Enhanced softening resistance and mechanical properties of Mo2C particle-reinforced Cu-matrix composites

Mo2C particles dispersion-strengthened copper matrix composites were fabricated by powder metallurgy and followed by a rolling process. Microstructure, mechanical properties, electrical conductivity, and softening resistance of Cu-xMo2C composites (x?=?2, 5, 7?wt%) were studied systematically. Cu-5Mo2C composite exhibited the best combination of performances among the three composites. The tensile strength, hardness, and electrical conductivity of the as-rolled Cu-5Mo2C composite reached 405.3?MPa, 130.7 HV, and 88.4?% IACS, respectively. Grain boundary strengthening and dislocation strengthening were the primary strengthening mechanisms. Mo2C particles presented a stable microstructure and inhibited the grain coarsening of the matrix. The softening temperatures of annealed Cu-2Mo2C, Cu-5Mo2C, and Cu-7Mo2C composites were 680 ?C, 770 ?C, and 805 ?C, respectively. These findings indicate that Mo2C particles can improve copper alloys? high-temperature softening resistance and mechanical properties.

» Author: Xiukuang Zhang, Qian Lei, Bin Liu, Xi Chen, You Li, Zhen Han, Huan Liu

» Reference: Composite Structures, Volume 305

» Publication Date: 01/02/2023

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