Recently, we reported a method for grain refinement of TiAl alloys by cycli
c heat treatment (CHT) only. However, the final microstructure appeared inh
omogeneous. containing grains of different sizes. In this study, a modified
route is provided for grain refinement including a heat treatment step jus
t below the alpha transus temperature, it is particularly shown that a coar
se fully lamellar structure can be refined to a fine one with a size of sim
ilar to 50 mum and the homogeneity of the microstructure can be significant
ly improved. (C) 2001 Elsevier Science Ltd. All rights reserved.