Preparation of TiAl-base Composites by the Combustion-reaction Process under a Nitrogen Gas

Abstract

The composites were prepared from elemental powders, i.e. titanium powders and aluminum powders. The powder mixtures, with a composition Ti₅₀Al₅₀(in atomic %), were cold isostatically pressed, and sintered under a nitrogen gas of 0.1 MPa for a time of 5 min at 1273 K. Consequently, (TiAl+Ti₃Al) and Ti₂AlN were produced by the combustion-reaction, and the resulting composite had about 30 vol% Ti₂AlN in the matrix TiAl. It was found that the composites have good strength and ductility at both room and elevated temperatures. Therefore, present investigations have considarable interest as a new combustion-reaction process to make a composite material.