The formation of Pt8Cr in Pt 10Â at.% Cr

Post deformation heat treatment of Pt 10 at.% Cr at temperatures below the recrystallisation temperature results in the formation of an ordered phase not predicted in the platinum-chromium phase diagram. Electron diffraction patterns show that the ordered structure is Pt8Cr, which has not previously been experimentally observed. Dark field imaging shows that the ordered regions are dispersed in a deformed matrix. The kinetics of the ordering transformation are very slow.