Effect of thermal conditions of preparation of dispersion-strengthened nickel powders on the character of distribution of the strengthening phase

Abstract

The thermal conditions of treatment of oxide powders produced by chemical coprecipitation exert a pronounced influence on the mechanical properties of semifinished products of dispersion-strengthened nickel made from these powders. Raising the calcining temperature of such oxide powders activates particle redistribution processes and has an adverse effect on the uniformity of distribution of the strengthening phase, which leads to the formation of large particles in the subsequent stages of plastic working and heat treatment of the powders and a steady deterioration in the mechanical properties of semifinished products.