Understanding effects of deformation parameters on dynamic recrystallization-dependent superplasticity in an Al-Cu-Li alloy
File(s)
Published version
Author(s)
Zou, Guotong
Zhang, Ruiqiang
Wang, Wei
Li, Jun
Ye, Lingying
Type
Journal Article
Abstract
Aluminum alloys with initial unrecrystallized structures generally exhibit better superplasticity and are produced more efficiently and cost-effectively than fully recrystallized ones. However, the underlying recrystallization and deformation mechanisms of dynamic recrystallization (DRX)-dependent superplastic aluminium alloys under varying deformation parameters are not yet fully understood. This study investigates the effects of deformation parameters, Al3Zr dispersoids, and coarse secondary particles on DRX and superplasticity in an Al-Cu-Li alloy. The alloy achieves a maximum elongation of 780 % at 430 °C and 0.002 s−1, primarily due to continuous dynamic recrystallization (CDRX) and grain boundary sliding (GBS). Under optimal conditions, deformed grains transform into equiaxed recrystallized grains through sub-grain rotation and coalescence, with GBS dominating subsequent deformation. Lower Zener-Hollomon parameter (lnZ) conditions promote dynamic recovery (DRV) and sub-grain growth, hindering grain refinement and superplastic deformation. Conversely, higher lnZ values inhibit recrystallization due to insufficient thermal driving force and lower DRV, resulting in retained banded grains and reduced elongation. Cu-rich secondary phases enhance CDRX but lose efficacy with their dissolution and coarsening at low lnZ conditions. This work provides insights into DRX-dependent superplastic mechanisms and offers guidance for optimizing deformation parameters to enhance the performance of aluminum alloys.
Date Issued
2025-04-01
Date Acceptance
2025-02-16
Citation
Materials & Design, 2025, 252
ISSN
0264-1275
Publisher
Elsevier
Journal / Book Title
Materials & Design
Volume
252
Copyright Statement
© 2025 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
License URL
Subjects
ACCOMMODATION MECHANISMS
Aluminum alloy
Deformation mechanism
DIFFUSION CREEP
DRAG
Dynamic recrystallization
Grain boundary sliding
Materials Science
Materials Science, Multidisciplinary
MICROSTRUCTURAL EVOLUTION
Science & Technology
STRAIN-RATE
Superplastic deformation
Technology
TEMPERATURE
Publication Status
Published
Article Number
113734
Date Publish Online
2025-02-17