Work

Synergistic enhancement of mechanical and electrical properties in (Ni2B+C)/Cu composites through heterogeneous architecture design

Year: 2026

Type: article

Abstract: To address the inherent strength-conductivity trade-off in copper matrix composites, this study successfully developed (Ni 2 B + C)/Cu composites with tailored heterogeneous architectures through powder metallurgy by regulating the particle size of (Cu-Ni + B 4 C) composite powders. The effects of architecture on microstructure, mechanical property, and electrical conductivity were systematically evaluated in both as-sintered and as-extruded states, while finite element simulations were employed to elucidate the underlying mechanisms governing load transfer and electron transport. The results demonstrate that the degree of heterogeneity can be effectively controlled by tuning the particle size of ball-milled composite powder. In the as-sintered state, heterogeneous composites exhibit lower tensile strength and elongation due to intergranular fracture, yet possess slightly higher conductivity compared to their homogeneous counterparts. Notably, hot extrusion transforms spherical Ni 2 B-enriched regions into rod-like structures, which enhance load transfer by inhibiting crack initiation and improve electron transport by reducing electron scattering, achieving a balance between strength and conductivity. When the (Cu-Ni + B 4 C) powder size is controlled within 109-150 μm, the resulting composite achieves an exceptional combination of high strength and hardness, while maintaining excellent ductility and electrical conductivity. These findings present a novel architectural design strategy for developing high-performance copper matrix composites with future potential for advanced electrical applications.

Source: Materials Chemistry and Physics

DOI: 10.1016/j.matchemphys.2026.133206