SELF-CONSOLIDATION AND SURFACE MODIFICATION OF MECHANICAL ALLOYED Ti-25.0 AT.% Al POWDER MIXTURE BY USING AN ELECTRO-DISCHARGE TECHNIQUE

摘要

Electrical discharges using a capacitance of 450 mu F at 0.5, 1.0, and 1.5 kJ input energies were applied in a N-2 atmosphere to obtain the mechanical alloyed Ti3Al powder without applying any external pressure. A solid bulk of nanostructured Ti3Al was obtained as short as 160 mu sec by the Electrical discharge. At the same time, the surface has been modified into the form of Ti and Al nitrides due to the diffusion process of nitrogen to the surface. The input energy was found to be the most important parameter to affect the formation of a solid core and surface chemistry of the compact.