Spark plasma sintering versus hot pressing - densification, bending strength, microstructure, and tribological properties of Ti5Al2.5Fe alloys

摘要

Ti5Al2.5Fe alloys were fabricated by the spark plasma sintering (SPS) and hot pressing (HP) pressure-assisted sintering techniques from pre-alloyed powders with a particle size of about 200m. The powders were sintered at 850 degrees C for two different holding times (5 and 8 min) and heating rates (50 and 150 degrees Cmin(-1)) at 25MPa. The maximum relative densities were 99.70 and 98.78% for SPS and HP samples, respectively. All the alloys prepared by the SPS process had significantly higher bending strengths (1825-2074MPa) than the alloys prepared by the HP process (648-1330MPa). A decrease in the heating rate from 150 to 50 degrees C min(-1) enhanced the wear resistance of the Ti5Al2.5Fe alloys prepared by both the SPS and HP processes.