Abstract
The microstructure and mechanical properties of TiB₂/Si nanocomposites based on the Ti-Si-B system, consolidated by spark plasma sintering of mechanically alloyed activated nanopowders, have been characterized. Mechanical Alloying was carried out in a planetary ball mill for 180 min with 350 rev min?¹. The powders were pressed in vacuum at a pressure of 60 ㎫, generating a maximum temperature in the graphite mould of 1400℃. Analysis of the synthesized nanocomposites by SEM, XRD and TEM showed them to consist of TiB₂ second phase, sub-micron in size, with no third phase. Composites consolidated from powders mechanically alloyed from an initial elemental powder mix of 0.3 mol Si, 0.7 ㏖ Ti, and 2.0 ㏖ B achieved the best relative density (97%) and bending strength (774 ㎫); the highest Vickers hardness of 14.7 ㎬ was achieved for the 0.1-0.9-2.0 mol starting composition.
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