Effect of High-Energy Mechanical Milling Time on Microstructure and Mechanical Properties of the Nano-sized TiAl Intermetallic Compounds Fabricated by Pulse Current Activated Sintering

摘要

The aim of this study was to determine the effect of high-energy mechanical mining (HEMM) time and sintering temperature on microstructure and mechanical properties of the TiAl composite fabricated by pulse current activated sintering. TiAl intermetallic powders were milled by HEMM for lh, 4h, and 8h respectively. Thermal analysis was used to observe the phase transformation of the milled TiAl powders. The sintering time decreased with increase of milling time. The hardness and fracture toughness of the sintered specimens also was improved with increasing mining time. The grain size of the sintered specimens which was milled for 4h was in the range of 50-100 nm.