Multiple strengthening mechanisms in nanoparticle-reinforced copper matrix composites
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The multiple hardening mechanisms of a copper matrix have been presented and discussed. The pre-alloyed ball milled Cu-3 wt.%Al and the atomized Cu-0.6 wt.%Ti-2.5 wt.%TiB(2) powders have been used as starting materials. Dispersoid particles Al(2)O(3) and TiB(2) 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 Al(2)O(3) particles. High hardening of Cu-0.6 wt.%Ti-2.5 wt.%TiB(2) is a consequence of the presence of modular structure, Cu(4)Ti((m)), and TiB(2) particles.