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Open AccessArticle

Complexity and Anisotropy of Plastic Flow of α-Ti Probed by Acoustic Emission and Local Extensometry

1
Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS, Université de Lorraine, Arts & Métiers ParisTech, F-57000 Metz, France
2
Laboratory of Excellence on Design of Alloy Metals for Low-Mass Structures (DAMAS), Université de Lorraine, F-57073 Metz, France
3
Laboratoire de Mécanique de Lille (LML), CNRS UMR 8107, Université de Sciences et Technologies Lille, Cité Scientifique, Boulevard Paul-Langevin, 59655 Villeneuve d’Ascq CEDEX, France
4
Laboratory of Metallic Materials with Spatial Gradient Structure, Togliatti State University, Belorusskaya St. 14, 445020 Tolyatti, Russia
5
Ascometal—CREAS, Avenue de France, 57300 Hagondange, France
*
Author to whom correspondence should be addressed.
Materials 2018, 11(7), 1061; https://doi.org/10.3390/ma11071061
Received: 25 May 2018 / Revised: 16 June 2018 / Accepted: 21 June 2018 / Published: 22 June 2018
(This article belongs to the Special Issue Design of Alloy Metals for Low-Mass Structures)
Current progress in the prediction of mechanical behavior of solids requires understanding of spatiotemporal complexity of plastic flow caused by self-organization of crystal defects. It may be particularly important in hexagonal materials because of their strong anisotropy and combination of different mechanisms of plasticity, such as dislocation glide and twinning. These materials often display complex behavior even on the macroscopic scale of deformation curves, e.g., a peculiar three-stage elastoplastic transition, the origin of which is a matter of debates. The present work is devoted to a multiscale study of plastic flow in α-Ti, based on simultaneous recording of deformation curves, 1D local strain field, and acoustic emission (AE). It is found that the average AE activity also reveals three-stage behavior, but in a qualitatively different way depending on the crystallographic orientation of the sample axis. On the finer scale, the statistical analysis of AE events and local strain rates testifies to an avalanche-like character of dislocation processes, reflected in power-law probability distribution functions. The results are discussed from the viewpoint of collective dislocation dynamics and are confronted to predictions of a recent micromechanical model of Ti strain hardening. View Full-Text
Keywords: titanium; strain hardening; anisotropy; strain heterogeneity; acoustic emission; statistical analysis; collective dislocation dynamics titanium; strain hardening; anisotropy; strain heterogeneity; acoustic emission; statistical analysis; collective dislocation dynamics
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MDPI and ACS Style

Lebyodkin, M.; Amouzou, K.; Lebedkina, T.; Richeton, T.; Roth, A. Complexity and Anisotropy of Plastic Flow of α-Ti Probed by Acoustic Emission and Local Extensometry. Materials 2018, 11, 1061.

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