Kinetics of A1 ↔ B2 phase transformations in Cu-Pd alloys

Abstract

The effect of different initial states on the kinetics of formation of an ordered structure in the Cu-Pd alloys with palladium contents of 47, 49, 50, and 55 at % is studied. The activation energy of atomic ordering in an equiatomic CuPd alloy after severe plastic deformation has been estimated. A nearly single-phase ordered B2-type state in the Cu-49 at % Pd and Cu-50 at % Pd alloy has been achieved. For this phase state of the alloys, the lowest reported room temperature resistivity has been achieved. The temperature boundaries of phase transformations in the investigated Cu-Pd alloys are found to be in contradiction with the generally accepted phase diagram.