Structure, Texture, and Substructure of Foil in Sequential Rolling Steps of Cu–36.4 at % Pd Alloy

— The phase composition, texture, and substructure of foil of a Cu–36.4 at % Pd solid solution have been studied by X-ray diffractometry and electron diffraction after rolling to a thickness of 320, 220, 180, 100, and 30 μm and subsequent heat treatment in vacuum to a temperature exceeding the upper temperature stability limit of an ordered structure. The results demonstrate that the general trends of changes in texture observed at all foil thicknesses during both deformation and subsequent heat treatment are controlled by ordering processes according to the Bain model and disordering processes, with allowance for the role of rolling deformation and recrystallization during subsequent heat treatment. At all foil thicknesses, heat treatment of the deformed samples leads to a decrease in the lattice parameter of the α-phase and an increase in that of the β-phase, suggesting an increase in the percentage of Pd in the β-phase and a decrease in that in the α-phase. The small change in the lattice parameter of the α-phase ensures the possibility of a complete α → β transformation.