Abstract
Morphological changes, structural evolutions and grain growth kinetics of mechanically alloyed(MAed) Fe 50Al 50, Fe 42.5Al 42.5Ti 5B 10 and Fe 35Al 35Ti 10B 20 (mole fraction, %) powders were investigated by XRD and SEM, when being isothermally annealed at 1 073–1 373 K. The effect of different Ti and B addition on the grain growth of FeAl phase was also discussed. The results show that the nanocrystalline FeAl and in-situ TiB 2/FeAl nanocomposite powders can be synthesized by subsequent heat treatment. Besides the relaxation of crystal defects and lattice stress, the transformation from Fe-based solid solution into B2-FeAl and TiB 2 occurs upon heating of the MA-processed alloys. Although the grain growth takes place, the grain sizes of both FeAl and TiB 2 are still in nanometer scale. The activation energies for the nanocrystalline FeAl growth in the three alloys are calculated to be 534.9, 525.6 and 1 069.6 kJ/mol respectively, according to kinetics theory of nanocrystalline growth. Alloys with different TiB 2 contents exhibit unequal thermal stability. The presence of higher content TiB 2 plays significant role in the impediment of grain growth.
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