Several processes that take place in metals and alloys are followed by the development of pores. Mutual diffusion of two components is particularly related to such processes when the diffusion coefficients of these components are different. Theoretical research on mutual diffusion enable one to determine the position of the pore developing locations from the demarcation plane. The effect of plastic deformation on the process of growth of pores was studied in mutual diffusion of two components. Nickel-Titanium and Copper-Titanium were selected as a diffusion pair. Diffusion heating was conducted so a different degree of specimen compression was employed.