Effect of stress reversals on the work hardening behaviour of polycrystalline copper

摘要: Abstract The flow behaviour of polycrystalline copper is determined under conditions where the loading direction reversed after increasing amounts prestress (or prestrain). It shown that Bauschinger effect (defined as response during early stages reverse flow) first increases and then saturates raised. In same stress range, work hardening rate, θ r , higher than from a continuous test f . Beyond this stage, becomes less difference Δ = - attains non-negligible values over an extended (strain) interval before it equal to zero. Concurrently, σ tends saturate begins rise again. suggested region “almost” constant lower coincide with partial dissolution dislocation tangles cell-walls observed by TEM. rearrangement substructure appears take place in treated employing two-component composite model.