Improved mechanical properties of 2024 aluminum alloys by electric pulse assisted rolling and subsequent aging
This study investigates the microstructural evolution and mechanical property modulation of 2024 aluminum alloy (70 % rolling reduction) through electro-pulse assisted rolling (EPAR, initial current density of 10 A/mm2) and subsequent aging treatment. Results indicate that EPAR-induced electron wind...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525004733 |
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| Summary: | This study investigates the microstructural evolution and mechanical property modulation of 2024 aluminum alloy (70 % rolling reduction) through electro-pulse assisted rolling (EPAR, initial current density of 10 A/mm2) and subsequent aging treatment. Results indicate that EPAR-induced electron wind force generates supplementary free energy, substantially accelerating dynamic recrystallization. Specifically, the recrystallization fraction is increased to 42.6 %, accompanied by a reduction in low-angle grain boundaries to 79 %. The dominant texture transitions from <111> Cubic to E{111} <110>, with a 52 % reduction in texture intensity. Additionally, dislocation density decreases from 3.42 × 1015 m−2 in conventional rolling to 3.18 × 1015 m−2, transitioning from entangled configurations to uniformly distributed dislocation walls aligned with the rolling direction. During 185 °C aging, the beneficial dislocation structure and reduced precipitation activation energy in EPAR-processed specimens shorten peak aging time, achieving ultimate tensile strength of 670.9 ± 31.7 MPa and elongation of 6.6 ± 0.2 %. Strength enhancement arises from synergistic effects of precipitation strengthening (average precipitate thickness: 1.62 nm) and dislocation interactions, while improved ductility correlates with homogeneous precipitate distribution. This research establishes a theoretical framework and technical strategy for streamlined production of high-strength, high-toughness aluminum alloys. |
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| ISSN: | 0264-1275 |