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Intrinsic structure of acoustic emission events during jerky flow in an Al alloy

Abstract : Scaling behavior is found in acoustic-emission events associated with stress drops observed in velocity-driven plastic deformation of an Al alloy, which exhibits jerky plastic flow. The occurrence of scaling proves that these acoustic-emission events, which are commonly regarded as “elementary” ones, have a small-scale self-organized structure comprising a group of peaks correlated in time. This structure reveals details of the temporal variation in elementary plastic events at a microsecond scale, which are hardly accessible by other measurement techniques.
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M.A. Lebyodkin, T.A. Lebedkina, F. Chmelík, T.T. Lamark, Y. Estrin, et al.. Intrinsic structure of acoustic emission events during jerky flow in an Al alloy. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2009, 79 (17), pp.174114. ⟨10.1103/PhysRevB.79.174114⟩. ⟨insu-00420864⟩

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