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

M.A. Lebyodkin (1) , T.A. Lebedkina (2) , F. Chmelík (3) , T.T. Lamark (4) , Y. Estrin (5, 6, 7) , C. Fressengeas (1) , Jérôme Weiss (8)

1 LPMM - Laboratoire de physique et mécanique des matériaux
2 ISSP - Osipyan Institute of Solid State Physics
3 Department of Physics of Materials
4 Bergen Engineering AS
5 ARC Centre of Excellence for Design in Light Metals
6 Department of Materials Engineering
7 CSIRO Division of Materials Science and Engineering
8 LGGE - Laboratoire de glaciologie et géophysique de l'environnement

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.

Keywords: acoustic emission; aluminium alloys; plastic flow; self-assembly

Domains: Glaciology

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), 2009, 79 (17), pp.174114. ⟨10.1103/PhysRevB.79.174114⟩. ⟨insu-00420864⟩