2009 Volume 49 Issue 3 Pages 453-457
The products with designed volume ratio of Ti5Si3 : TiAl3=1 : 0, 3 : 1, 1 : 1, 1 : 3 and 0 : 1 prepared by self-propagating high-temperature synthesis (SHS) were investigated in the present study. The differential thermal analysis (DTA) results suggested that the Si in reactants had a significant influence not only on the melting of Al, but also on the subsequently exothermic reaction between Ti and Al. Also, the presence of Al altered the reaction process of Ti5Si3. The phase composition of SHS reaction product agreed well with the designed volume ratio of Ti5Si3 : TiAl3. Compared with those apparently coarse ones in monolithic Ti5Si3 or TiAl3, the grains were considerably refined and microcracks gradually disappeared in products with coexistence of Ti5Si3 and TiAl3.