Titre :

Fabrication of fine grain structures in Al matrices at elevated temperature by the stimulation of dual-size particles

Auteur(s) :

Liu, Jun [Auteur]
Shanghai Jiao Tong University [Shanghai]
Zhang, Qing [Auteur]
Shanghai Jiao Tong University [Shanghai]
Chen, Zhe [Auteur]
Shanghai Jiao Tong University [Shanghai]
Wang, Lei [Auteur]
Shanghai Jiao Tong University [Shanghai]
Ji, Gang [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Unité Matériaux et Transformations - UMR 8207 [UMET]
Shi, Qiwei [Auteur]
Shanghai Jiao Tong University [Shanghai]
Wu, Yi [Auteur]
Shanghai Jiao Tong University [Shanghai]
Zhang, Fengguo [Auteur]
Shanghai Jiao Tong University [Shanghai]
Wang, Haowei [Auteur]
Shanghai Jiao Tong University [Shanghai]

Titre de la revue :

Materials Science and Engineering: A

Numéro :

805

Pagination :

140614

Éditeur :

Elsevier BV

Date de publication :

2021-02-23

ISSN :

0921-5093

Mot(s)-clé(s) en anglais :

Aluminum alloys
Plasticity methods
Grains and interfaces
Dynamic recrystallization
Grain growth
Particle

Discipline(s) HAL :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

Résumé en anglais : [en]

Fabrication of fine grain structures in Al alloys at elevated temperature is of great difficulty, owing to the dramatic recrystallization and grain growth. In this study, particles with both (sub)micron and nano-scaled ...
Lire la suite >Fabrication of fine grain structures in Al alloys at elevated temperature is of great difficulty, owing to the dramatic recrystallization and grain growth. In this study, particles with both (sub)micron and nano-scaled sizes are introduced in Al matrices (composites) to deeply refine and stabilize the grain structures at high temperature. Microstructural evolutions of the composites during deformation and annealing are characterized in details compared to the alloy counterparts without particles. Consequently, more rapid and obvious grain refinement are induced in the composites. Mechanisms of these grain refinement are discussed in terms of the influences of dual-size particles. Initial particle clusters can enforce grain fragmentations during unidirectional extrusion, and the subsequently dispersed micron particles accelerate the grain subdivision during orthogonal extrusion. Meanwhile, massive (sub)micron particles and dense nanoparticles promote dynamic recrystallizations in composites during deformation, thanks to the particle stimulated nucleation and lattice rotation. According to the driving and dragging forces calculation and textural results, grain growth is the major mechanism to determine the annealed structures of composites and alloys. As a result, uniformly fine grain structures are achieved in composites, approaching a stable critical size decided by the Zener pinning of nanoparticles.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Métallurgie Physique et Génie des Matériaux

Date de dépôt :

2021-02-16T21:59:37Z
2021-02-17T10:42:37Z