Title :

Experimental and modelling assessment of ductility in a precipitation hardening AlMgScZr alloy

Author(s) :

Chen, Han [Auteur]
Shanghai Jiao Tong University [Shanghai]
Chen, Zhe [Auteur]
Shanghai Jiao Tong University [Shanghai]
Ji, Gang [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Zhong, Shengyi [Auteur]
Shanghai Jiao Tong University [Shanghai]
Wang, Haowei [Auteur]
Shanghai Jiao Tong University [Shanghai]
Borbély, András [Auteur]
Laboratoire Georges Friedel [LGF-ENSMSE]
Ke, Yubin [Auteur]
Dongguan University of Technology
Bréchet, Yves [Auteur]
Science et Ingénierie des Matériaux et Procédés [SIMaP]

Journal title :

International Journal of Plasticity

Volume number :

139

Pages :

102971

Publisher :

Elsevier BV

Publication date :

2021-03

ISSN :

0749-6419

English keyword(s) :

Ductility
Precipitates
Dislocations
A dislocation-based approach
Modelling

HAL domain(s) :

Chimie/Matériaux
Chimie/Polymères

English abstract : [en]

Precipitation hardening is the most effective strategy to enhance the mechanical properties of metals. Dislocation mechanisms to control strengthening during precipitation have been demonstrated extensively. However, owing ...
Show more >Precipitation hardening is the most effective strategy to enhance the mechanical properties of metals. Dislocation mechanisms to control strengthening during precipitation have been demonstrated extensively. However, owing to the complexity of different precipitates in alloys, variations in ductility caused by precipitation are complex and have not been clarified so far. In this study, the effects of precipitation on ductility in precipitation hardening aluminium alloys are investigated based on a modified dislocation-based approach and experimental characterisation. The AlMgScZr alloy with spherical Al3(Sc, Zr) precipitates is used as a model alloy system to understand the effects of precipitation on ductility. Via heat treatment, shearable and nonshearable Al3(Sc, Zr) precipitates are introduced in the AlMg matrix. The results show that the ductility of AlMgScZr alloy decreases when shearable precipitates occur, while it increases with shearable precipitates being replaced by nonshearable precipitates. The variation in ductility of AlMgScZr alloy is mainly controlled by the dynamic recovery rate of the dislocations. Finally, by analysing the different precipitate–dislocation interactions and evaluating the dislocation density evolution during deformation, the dislocation mechanisms of ductility during precipitation for AlMgScZr alloy are demonstrated. This study reveals the dislocation mechanism for controlling ductility during precipitation for AlMgScZr alloy which can provide a theoretical foundation for the design of high-performance structural materials.Show less >

Language :

Anglais

Audience :

Non spécifiée

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Métallurgie Physique et Génie des Matériaux

Submission date :

2021-03-11T20:51:29Z
2021-03-12T10:43:23Z