Copper and copper alloys CuNi, CuZn and CuNiSn were prepared by a powder metallurgical method. Sintered copper and copper alloys were subjected to cold rolling with different degrees of deformation (30, 50 and 70%). The copper and alloys in the cold-rolled state was isochronally annealed up to the recrystallization temperature during which the hardness and electrical conductivity were measured. These investigations show that anneal hardening effect occurs in a temperature range of 180-400°C, followed with an increase in hardness.
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