The methods of differential thermal analysis and resistometry are used to investigate alloys Pt50Ni50-xCux(x=0, 3, 5, 10, 15, 25) during heating after plastic deformation and ordering annealing. It is shown that the latter does not remove the effects of plastic deformation and disordering of the alloys during heating is followed by their recrystallization. The relative position of the temperature ranges of these processes and the thermal effect of disordering are governed by the copper content.