About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Computational Thermodynamics and Kinetics
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Presentation Title |
H-5: Time-cone Based Models of Nucleation and Growth in Polycrystalline Systems |
Author(s) |
Siu Sin Jerry Quek, Jing Xiang Ng, David T. Wu |
On-Site Speaker (Planned) |
Siu Sin Jerry Quek |
Abstract Scope |
Nucleation and growth during phase transformation can be described by the classical works of Johnson and Mehl, Avrami and Kolmogorov (JMAK)1, which is rigorously derived within the assumptions of isotropic & interface-limited growth, random nucleation in space and an infinite system. However, in most solid-state transformation, precipitation occurs in a polycrystalline domain and is diffusion-limited, violating JMAK’s assumptions. Therefore, we address the effects of a grain boundary network on nucleation and growth kinetics using time-cone based theories and simulations. Specifically, we consider the two limiting cases of grain boundaries that are permeable2 and impermeable3 to phase transformation. We also elucidated the effects of grain aspect ratio on the transformation kinetics in these contexts.
1 W.A. Johnson and R.F. Mehl (1939); M. Avrami (1939-1941); A.N. Kolmogorov (1937)
2 J.W. Cahn, Acta Metallurgica (1956) 4, 449-459.
3 E. Villa and P.R. Rios, Acta Materialia 58 (2010), 2752-2768. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Phase Transformations, Modeling and Simulation |