Superior Combination of Strength and Electrical Conductivity in Cu/Al₂O₃ Composite by Introducing High-volume-fraction Ultrafine Grains

• DOI: 10.2497/jjspm.15p-t13-08
• Publication Date: 2025-03-14T22:17:25Z
• Authors: Jun Zhang; Xi Liu; Shuang Zhang; Wangtu Huo
• Keywords: Volume fraction

High-strength Cu/Al2O3 composites usually exhibit obviously deteriorated electrical conductivity when compared with their low-strength counterparts. In this work, a chemical and mechanical alloying-based strategy was adopted to fabricate an ultrafine composite powder low-content reinforcement construct combined structure of Cu powders covered in-situ Al2O3 nanoparticles. After consolidation at relatively lower sintering temperature 550 ℃, high-volume-fraction grains were introduced into the composite, many nanoparticles average size 11.7±7.5 nm dispersed homogeneously in grain interior. As result, showed excellent combination high tensile strength (654±1 MPa) (84.5±0.1% IACS), which ascribed synergistic strengthening effect grains, dislocations This approach using as precursor followed by low-temperature high-pressure may have potential be applied large-scale industrial production high-performance oxide dispersion strengthened alloys.