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Role of Self-Organization of Dislocations in the Onset and Kinetics of Macroscopic Plastic Instability

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Abstract

The present paper examines two aspects of the problem of critical conditions of jerky flow in alloys, or the Portevin–Le Chatelier (PLC) effect. Recent development of dynamic strain aging (DSA) models proved their capacity to qualitatively reproduce complex non-monotonic behavior of the critical strain, providing that the parameters of theory are allowed to depend on strain. Experimental measurements of such strain dependences have been realized for the first time and used to revise the predictions of the critical strain and stress relaxation kinetics upon abrupt strain-rate changes. On the other hand, it is usually omitted from consideration that the PLC stress serrations can last very short time in comparison with the characteristic time of stress transients. The development of stress drops was studied with the aid of the acoustic emission (AE) technique. It is shown that such macroscopic instabilities are caused by clustering of AE events which otherwise occur all the time, including the periods of smooth plastic flow. The role of synchronization of dislocation avalanches in the development of abrupt stress serrations and its relationship with the predictions of the local DSA models is discussed.

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Notes

  1. Preliminary results of this study were presented in proceedings.[26]

  2. A more detailed analysis shows that some superposition amplifying A-values can sometimes be detected. Such analysis will be published elsewhere.

  3. From the first view, the perfect synchronization could even produce a catastrophic process involving the whole sample. However, this process is stopped because of the fall in the applied stress due to the elastic reaction of the deformation machine when the plastic strain rate exceeds the imposed strain rate (see Eq. [6]).

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Acknowledgments

This work was supported by the Region Lorraine (France) and the Center of Excellence “LabEx DAMAS” through the French State program “Investment in the future” (Grant ANR-11-LABX-0008-01 of the French National Research Agency).

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Authors and Affiliations

  1. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russia, 142432

    Nikolay P. Kobelev

  2. Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux (LEM3), UMR CNRS 7239, Université de Lorraine, Ile du Saulcy, 57045, Metz Cedex 01, France

    Mikhail A. Lebyodkin & Tatiana A. Lebedkina

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  1. Nikolay P. Kobelev
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  2. Mikhail A. Lebyodkin
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  3. Tatiana A. Lebedkina
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Correspondence to Mikhail A. Lebyodkin.

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Manuscript submitted July 24, 2016.

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Kobelev, N.P., Lebyodkin, M.A. & Lebedkina, T.A. Role of Self-Organization of Dislocations in the Onset and Kinetics of Macroscopic Plastic Instability. Metall Mater Trans A 48, 965–974 (2017). https://doi.org/10.1007/s11661-016-3912-x

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