Abstract
Combustion synthesis of Ti2AlN was carried out in air and pressurised N2 respectively. The reaction atmosphere had an evident effect on the phase composition and microstructure of the products. By combustion synthesis in 2 MPa N2, Ti2AlN was synthesised as the major product, but in the samples prepared in air, Ti2AlN was obtained only as a minor phase, and the predominant phases were Ti–Al intermetallics. The reaction mechanism has been studied, suggesting that TiN is a key intermediate in the formation of Ti2AlN. It is proposed that, in the combustion synthesis of Ti2AlN, the flux of N2 plays an important role in determining both reaction kinetics and phase composition of the products.
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