About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
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Microstructure-Sensitive Design and Advanced Characterization: An MPMD/SMD Symposium Honoring David T. Fullwood
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| Presentation Title |
Mechanistic Origin of Portevin–Le Chatelier Suppression in Cu-Reinforced Al-Mg Alloys: An Experimentally Validated Molecular Dynamics Study |
| Author(s) |
Sumit Choudhary, Akarsh VERMA |
| On-Site Speaker (Planned) |
Sumit Choudhary |
| Abstract Scope |
The Portevin-Le Chatelier (PLC) effect, caused by dynamic strain aging in Al-Mg alloys, adversely affects their formability and mechanical reliability. This study investigates the atomistic mechanisms underlying PLC suppression in Cu-reinforced AA5086-H116 using an integrated experimental and molecular dynamics (MD) approach. Copper was incorporated through friction stir processing (FSP), producing coarse and refined Cu distributions via single- and double-pass processing. MD simulations using the Modified Embedded Atom Method (MEAM) potential reveal that uniformly distributed Cu delays dislocation nucleation and promotes homogeneous plastic deformation, whereas Cu clustering induces stress concentration and early dislocation multiplication. Random Cu distribution achieved an ultimate tensile strength of 4.46 GPa, while clustered configurations exhibited nearly 17% lower strength. Experimental tensile results agree with the simulations, showing refined Cu dispersion suppresses serrated flow initiation and improves mechanical performance, providing atomistic insights for designing high-performance Al-Mg alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, Aluminum |