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Jerky flow in solids results from collective dynamics of dislocations whichgives rise to serrated deformation curves and a complex evolution of the strainheterogeneity. A rich example of this phenomenon is the Portevin-Le Chateliereffect in alloys. The corresponding spatiotemporal patterns showed someuniversal features which provided a basis for a well-known phenomenologicalclassification. Recent studies revealed peculiar features in both the stressserration sequences and the kinematics of deformation bands in Al-based alloyscontaining fine microstructure elements, such as nanosize precipitates and (or)submicron grains. In the present work, jerky flow of an AlMgScZr alloy isstudied using statistical analysis of stress serrations and the accompanyingacoustic emission. As in the case of coarse-grained binary AlMg alloys, theamplitude distributions of acoustic events obey a power-law scaling which isusually considered as evidence of avalanchelike dynamics. However, the scalingexponents display specific dependences on the strain and strain rate for theinvestigated materials. The observed effects bear evidence to a competitionbetween the phenomena of synchronization and randomization of dislocationavalanches, which may shed light on the mechanisms leading to a high variety ofjerky flow patterns observed in applied alloys.

Correlation versus randomization of jerky flow in an AlMgScZr alloy using acoustic emission