Preparation and properties of porous Ti–Al alloys by reactive infiltration

Abstract

Highly porous (70%) and large pore sized Ti–Al alloys with low thermal conductivity were successfully fabricated by reactive infiltration of Al in porous Ti preform. The porousTi–Al alloy has a single phase structure of γ-TiAl, and the average pore size is ∼100 μm. The formation mechanism of the porous structure was discussed. The thermal conductivity was determined by the laser flash method, and the effect of porosity on the thermal conductivity was studied. The thermal conductivity of the porous Ti–Al alloy is about 1/3 of the bulk alloy. The results show that the porous Ti–Al alloys have good bending strength.