Abstract
Chemical long-range order kinetics were studied for the Ll 2-ordered γ′-phase domains of the quasi-binary systems Ni 75AL 25− x M x (M = Fe, Mn, Cr, 0 ≤ x ≤ 25), where the γ′-phase stability (ordering energy) rapidly decreases with increasing M-component concentration x. The sample γ′ homogeneity was tested by means of transmission electron microscopy. The ‘order-order’ relaxations measured by means of in-situ resistometry indicated that an increase in x caused a systematic decrease in the activation energy, E A, of homogeneous long-range order kinetics. Discussing a possible influence of various parameters, it was concluded that the observed decrease in E A was predominantly due to an effect of the ordering energy on the bulk vacancy diffusion in these Ll 2-ordered compounds.
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