Development of TiB2 reinforced in-situ Ti aluminide matrix composite through reaction synthesis

Abstract

TiB 2 reinforced in-situ titanium aluminide matrix composite was made through reaction synthesis process using high purity elemental powders of Ti, Al, Cr, Nb and B. XRD of the synthesized block showed presence of mainly Al 3 Ti and TiB 2 phases. To obtain γ Ti aluminide based matrix, the material was homogenized in two phase region (α 2 +γ). Presence of γ phase matrix alongwith α 2 was confirmed through XRD, SEM and TEM. Uniform distribution of TiB 2 phase was confirmed through elemental mapping and by analyzing specimens of different locations. Differential scanning calorimetry of powder mixture showed presence of endothermic peak for Al melting and exothermic peak of Ti aluminide and TiB 2 formation.

Differential scanning calorimetry and reaction kinetics studies of γ + α2 Ti aluminide

“…DSC of boron containing alloys (A2eA5) is carried out to know the formation of phases in presence of Boron. TiB 2 is not detected in alloy mixture of alloys A2eA5, which may be due to too small content to detect through XRD, whereas the same could be detected when content of boron is increased to 10 (at%) [44].…”