Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Metals Année : 2017

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

Résumé

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.
Fichier principal
Vignette du fichier
Zhemch_Metals17.pdf (6.27 Mo) Télécharger le fichier
Origine : Publication financée par une institution
Loading...

Dates et versions

hal-02357747 , version 1 (10-11-2019)

Licence

Paternité

Identifiants

Citer

Daria Zhemchuzhnikova, Mikhail Lebyodkin, Tatiana Lebedkina, Anna Mogucheva, Diana Yuzbekova, et al.. Peculiar Spatiotemporal Behavior of Unstable Plastic Flow in an AlMgMnScZr Alloy with Coarse and Ultrafine Grains. Metals, 2017, 7 (9), pp.325. ⟨10.3390/met7090325⟩. ⟨hal-02357747⟩
18 Consultations
16 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More