Changes of microstructure and electrical resistivity of ordered Cu-40Pd (at.%) alloy under severe plastic deformation

Changes of the microstructure and the electrical resistivity under severe deformation of the Cu-40 at % Pd alloy ordered after the B2 type have been studied. The ordered phase has been found to be highly stable. It has been shown that a nanocrystalline disordered structure (the A1 type) with crystallites less than 100 nm in size is formed under severe plastic deformation (ε ≈ 6.5) in the whole volume of the sample. Further deformation to ε ≈ 7.5 has led to the formation of highly dispersed crystallites about 5 nm in size having an unknown structure.

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► The microstructure of the ordered Cu-40 at.% Pd alloy under severe deformation has been studied.
► The high stability of the ordered B2 phase has been found.
► The nanocrystalline disordered FCC structure with crystallites less than 100 nm in size is formed.
► The highly dispersed crystallites about 5 nm nm in size having an unknown structure are obtained.