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Experimental and computer simulation studies of atomic migration during chemical order relaxation in Ll2 intermetallics.

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Kozubski R. , Oramus P. , Cadeville M. C. , Pierron-Bohnes V. , Pfeiler W.

tom R. XIX, nr 4

884-887

Long-range order (LRO) relaxations, processes controlled by atomic migration in a superstructure , were studied in Ni3Al-based Ll2-ordered intermetallic compounds. The activation energy EA of the relaxation increased with increasing stability of the superstructure and for binary Ni3Al reached 4.6 eV. It is concluded that the value results from the high Al-vacancy formation energy in Ni3Al. The LRO relaxations were composed of two parallel processes showing different rates. The origin of the latter effect was studied by means of Monte Carlo computer simulations, which indicated a predominant role of Al-atom jumps.