Synthesis of Ti-TiAl3 Composite by Resistive Sintering

Abstract

In the present work, Ti-TiAl₃ metallic-intermetallic in situ composites were synthesized by one step resistive sintering method. Process time had been completed in 90 second using 1.5-1.7 Volt and 2000 Amper direct current. Ti and Al elemental powders were mixed by the stoichiometric ratio corresponding to the TiAl₃ intermetallic phases' with molar proportion of 1:3. We aimed to obtain some residual ductile Ti phase as well as the TiAl₃ major phase in structure. XRD analyses detected the only phases in the composite were Ti and TiAl₃. TiAl₂ phase also detected as trace peak in the XRD Chart. SEM examinations showed a dense microstructure with low amount of porosity. The relative density of the sample measured according to Archimedes’ principle was 98,7%, and the microhardness of the sample was about 455±20 HV.