About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
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Presentation Title |
Thermodynamic Formation Mechanism of Chemical Short-range Order and Its Influence on Elastoplastic Deformation in Multi-principal Elemental Alloys |
Author(s) |
Yunjiang Wang |
On-Site Speaker (Planned) |
Yunjiang Wang |
Abstract Scope |
In the past two decades, materials science has witnessed a remarkable breakthrough with the introduction of multiple principal elements into a single-phase crystal, leading to a conceptual revolution in physical metallurgy known as multi-principal elemental alloys (MPEAs). These alloys exhibit a unique characteristic where chemical short-range order (SRO) is formed due to the competition between enthalpic and entropy interactions. However, the underlying physical mechanism behind SRO formation remains incompletely understood, and its impact on the mechanical properties of MPEAs is still being explored. In this presentation, I will elucidate the process of chemical disorder-order transition in solid solutions by examining the absolute free energy of the alloy configuration. Through atomistic simulations, I will discuss the role of SRO in phonon instability, diffusion, and dislocation plasticity. Furthermore, I will emphasize the significance of vibrational and configurational entropy in comprehending the thermodynamic stability and deformation mechanisms of MPEAs. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, High-Entropy Alloys, Mechanical Properties |