Multiple strengthening mechanisms in nanoparticle-reinforced copper matrix composites

Abstract

The multiple hardening mechanisms of a copper matrix have been presented and discussed. The prealloyed ball milled Cu-3 wt.%Al and the atomized Cu-0·6 wt.%Ti-2·5 wt.%TiB2 powders have been used as starting materials. Dispersoid particles Al2O3 and TiB2 were formed in situ. The powders have been hot consolidated. Optical microscopy, SEM, TEM, and X-ray diffraction analysis were performed for microstructural characterization. Increase in microhardness of Cu-3 wt.%Al compacts is a consequence of the crystallite size refinement and the presence of Al2O3 particles. High hardening of Cu-0·6 wt.%Ti-2·5 wt.%TiB2 is a consequence of the presence of modular structure, Cu4Ti(m), and TiB2 particles. © Indian Academy of Sciences.