No abstract

DIGM phenomenon is very similar to the diffusion process and the coupled migration of the reaction front occured in discontinuous precipitation. It is likely to postulate that DIGM may occur in the system where discontinuous precipitation appears. W. Kim and co-author have Investigated DIGM In six copper alloy systems (Ag/Cu, Mg/Cu, Sb/Cu, In/Cu, Cd/Cu and Sn/Cu) in which discontinuous precipitation has been found. In Kim s experiment, the diffusion treatments were conducted at 400 °C and 450 °C for 4 days, Kim found DIGM occurred in 4 systems, i. e. Sb/Cu, In/Cu, Cd/Cu and Sn/Cu, but in Ag/Cu and Mg/Cu systems no DIGM was found.In order to test whether there is DIGM or not in Ag/Cu system, we reexamlned the DIGM phenomenon in Ag/Cu under 400 °C and 480 °C for 5 days diffusion, finally DIGM was found in this system. In different segments of a same boundary the bulging directions and the migration distances may be different as indicated in Fig. 1.