Copper and copper alloys were prepared by a powder metallurgical method. Si
ntered copper and copper alloys were subjected to cold rolling with differe
nt degrees of deformation. The alloy in the cold-rolled state was isochrona
lly annealed up to the recrystallization temperature during which the hardn
ess was measured. These investigations show that anneal hardening effect oc
curs in a temperature range of 473-673 K.