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Metals 2017, 7(9), 325; doi:10.3390/met7090325

Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains

1
Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), CNRS UMR 7239, Université de Lorraine, 7 rue Félix Savart, BP 15082, 57073 Metz CEDEX 03, France
2
Center of Excellence “LabEx DAMAS”, Université de Lorraine, 7 rue Félix Savart, 57073 METZ, France
3
Togliatti State University, Belorusskaya St. 14, Tolyatti 445020, Russia
4
Laboratory of the Mechanical Properties of Nanoscale Materials and Superalloys, Belgorod State University, Pobedy Street 85, Belgorod 308015, Russia
*
Author to whom correspondence should be addressed.
Received: 20 July 2017 / Revised: 14 August 2017 / Accepted: 18 August 2017 / Published: 23 August 2017
(This article belongs to the Special Issue Synthesis and Properties of Bulk Nanostructured Metallic Materials)
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Abstract

The work addresses the effects of nanosize particles and grain refinement on the patterns of stress serrations and kinematics of deformation bands associated with the Portevin–Le Chatelier instability of plastic flow. Ultra-fine-grained microstructure was obtained using equal-channel angular pressing of the initial coarse-grained alloy. Tensile tests were carried out on flat specimens at strain rates in the range from 3 × 10−5 to 1.4 × 10−2 s−1. Using local extensometry techniques, it was found that the presence of nanoscale precipitates promotes quasi-continuous propagation of deformation bands in the entire strain-rate range. The grain refinement leads to a transition to relay-race propagation at high strain rates and static strain localization at low rates. The results are discussed from the viewpoint of competition between various dynamical modes of plastic deformation associated with collective dynamics of dislocations. View Full-Text
Keywords: aluminum alloys; precipitates; severe plastic deformation; mechanical characterization; Portevin–Le Chatelier effect; deformation bands; collective dislocation dynamics aluminum alloys; precipitates; severe plastic deformation; mechanical characterization; Portevin–Le Chatelier effect; deformation bands; collective dislocation dynamics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhemchuzhnikova, D.; Lebyodkin, M.; Lebedkina, T.; Mogucheva, A.; Yuzbekova, D.; Kaibyshev, R. Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains. Metals 2017, 7, 325.

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