Phase evolution in driven alloys: An overview on compositional patterning

摘要: Abstract Irradiation of alloys with energetic particles leads to the forced chemical mixing atoms and creation point defects. At elevated temperatures, defects are mobile enhance diffusion. Since occurs in displacement processes, alloy constituents tend flow down gradients their concentration, while radiation enhanced diffusion is thermally activated components respond potential. Phase evolution irradiated thus depends on competition between these two dynamics. A similar situation during severe plastic deformation, dislocation glide results mixing, reactions lead vacancies One possible consequence competing dynamics that self-organize into compositional patterns, i.e., concentration variations adopt a fixed length scale determined by nature driving forces internal alloy. The current perspective illustrates how details relate patterns morphology. surprising finding irradiation deformation can also patterning even at low absence While again derives from dynamical characteristic scales quite different aspects mixing. For irradiation, ballistic recoil distance limits maximum for high it extent thermal spike temperatures. dislocations controls largest whereas kinetic roughening precipitates