ON THE EFFECT OF FINE 2ND-PHASE PARTICLES ON PRIMARY RECRYSTALLIZATION AS A FUNCTION OF STRAIN

Some alloys containing fine, undeformable, second-phase particles (typ ically, 25 nm < diameter < 1 mu m, 8 nm < interparticle-spacing < 0.5 mu m) can display either accelerated or retarded recrystallization dep ending on the particle dispersion parameters. The recrystallization of a series of such alloys, internally oxidized (112)[11 (1) over bar] s ingle crystal plates of copper containing SiO2 particles, has been exa mined over a range of true strains from 32% to 335%. The stored energi es and recrystallization temperatures have been measured at various st rain levels using differential scanning calorimetry. A model to explai n the recrystallization kinetics based on a balance between the extra stored energy of deformation due to the geometrically-necessary disloc ations associated with the particles and particle pinning is presented . The experimental results are found to be in reasonable agreement wit h this model. Copyright (C) 1997 Acta Metallurgica Inc.