| Title |
Research Paper - Composite Materials - : In - situ Synthesis of TiB2 Particle Reinforced TiAl based Intermetallic Composites |
| Authors |
이태원(T . W . Lee); 이지환(C . H . Lee); 황선근(S . K . Hwang); 박원구(W . K . Park) |
| Abstract |
This study was focused to examine fabrication process of TiB₂ particle reinforced TiAl based intermetallic composites by reactive synthesis. The mixed powders were canned, hot-pressed under vacuum and then hot-extruded at 420℃ under extrusion ratio of 15:1. Subsequently. reactive synthesis was carried out at 700℃ under vacuum Thermal analysis has been perfomed to investigate the ignition temperature and combustion temperature for Ti-Al system and Ti-Al-B system. The combustion temperature of Ti-Al-B powder mixture was found to be higher than that of Ti-Al powder mixture. The Ti-Al-B powder mixture was reacted exothermically to form the material consisting of TiAl and TiB₂. The tensile strength of the TiB₂/TiAl composites was proved to be higher than that of the matrix. Swelling phenomenon, resulting from formation of a large amount of pores was observed at all reactive synthesis conditions. |