The proceedings of an International Conference "Diffusion in Metals and Alloys" (DIMETA-82, Hungary, September 1982) are related to physical metallurgy and are dedicated to researching various types of diffusion processes in metals and alloys, intermetallic compounds, amorphous metals, and heterogeneous systems. There are articles in this issue also devoted to grain boundary and surface diffusion phenomena, crystallographic defects, and novel experimental methods of diffusion phenomena study.