A COMPARISON OF THE MESOMECHANISM OF DYNAMIC DEFORMATION BETWEEN COPPER AND ALUMINUM

In this paper, a comparison of the mesomechanism of dynamic deformatio n between Cu alloy and Al alloy is made. It is shown that, during dyna mic deformation, two effects occur, one being a hardening effect by th e increasing of dislocations, the other bring a softening effect by th e nucleation, growth and coalescence of microvoids. Fracture is due to the coalescence of a large amount of voids. It is shown also that the nucleation of microvoids is due to fault energy and second-phase part icles. The nucleations of Al alloy rely on the second-phase particles and the nucleations of Cu alloy rely on the second slipping of disloca tion by lower fault energy. (C) 1997 Elsevier Science S.A.