title: Multifractal burst in the spatiotemporal dynamics of jerky flow.
abstract: The collective behavior of dislocations in jerky flow is studied in Al-Mg polycrystalline samples subjected to constant strain rate tests. Complementary dynamical, statistical, and multifractal analyses are carried out on the stress-time series recorded during jerky flow to characterize the distinct spatiotemporal dynamical regimes. It is shown that the hopping type B and the propagating type A bands correspond to chaotic and self-organized critical states, respectively. The crossover between these types of bands is identified by a large spread in the multifractal spectrum. These results are interpreted on the basis of competing scales and mechanisms.
authors.affiliation: Materials Research Centre, Indian Institute of Science, Bangalore 560 012, India.
authors.forename: M S
authors.initials: MS
authors.lastname: Bharathi
authors.forename: M
authors.initials: M
authors.lastname: Lebyodkin
authors.forename: G
authors.initials: G
authors.lastname: Ananthakrishna
authors.forename: C
authors.initials: C
authors.lastname: Fressengeas
authors.forename: L P
authors.initials: LP
authors.lastname: Kubin