EFFECT OF PROCESSING CONDITION ON THE PROPERTIES OF AL AL3TI COMPOSITES PRODUCED BY LCCS PROCESS/

Production of Al matrix/Al3Ti composite materials has been performed b y the Low Pressure Casting-Combustion Synthesis Process(LCCS process). The formation of Al3Ti in the composites produced by the LCCS process was accelerated drastically at the temperatures higher than 1193 K. A t the particle size between 25 similar to 125 mu m, the volume fractio n of Al3Ti in the composites increased with decreasing particle size. When the Al-Ti mixed powder was kept in liquid Al at 1193 K for 15 s, the microstructure of the composites produced was homogeneous up to th e length of 90 mm from the liquid Al entrance. With increasing Ti cont ent in the mixed powder, decreasing particle size of the mixed powder and increasing immersion time of the mixed powder in liquid Al, the te nsile strength of the composite increased but its elongation decreased . On the fracture surfaces of the composites, transgranuler cracks wer e observed in the Al3Ti particles due to the good bonding between Al m atrix and Al3Ti particles.