Ordering Kinetics in B2-FeAl
Changes in the degree of long-range order (LRO) have been investigated in B2-ordered intermetallic Fe-44.8at%Al by residual resistometry. Order variations were observed during isochronal and isothermal small-step annealing after different thermal pre-treatment. It is observed that atomic mobility in this alloy starts at about 500K. Between 500K and 700K reversible changes of resistivity are interpreted as arising from local changes of order only. Above 710K changes of LRO are observed which lead to the reversible adjustment of equilibrium plateau values above 870K. Two individual processes are found for both ordering regimes, which concern only local sample areas and the total sample volume, respectively.
KeywordsAnnealing Time Activation Enthalpy Atomic Mobility Isochronal Annealing Isothermal Measurement
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