The diffusion model of pores vacancy dissolution at gaseous isostatic pressing of heat resistant nickel alloy monocrystal

Diffusion model of vacancy dissolution of pores under the action of all-round compression stresses (gas isostatic pressing) and capillar forces is proposed. The experiments are carried out using a nickel base heat resistant alloy single crystal. At the initial stage of the process the external pressure effect is shown to be predominant. The time of dissolution is in inverse proportion to the stress and depends quadratically on the initial pore size. At the final stage (a pore radius less than 100 nm) the pore disappears rapidly under the action of capillar forces