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Meeting MS&T21: Materials Science & Technology
Symposium Nucleation of Solid-State Phase Transformations
Presentation Title Critical Nuclei at Hetero-phase Interfaces
Author(s) Rongpei Shi, Tae Wook Heo, Brandon Wood, Yunzhi Wang
On-Site Speaker (Planned) Rongpei Shi
Abstract Scope Two-step nucleation, wherein a metastable phase acts as a precursor for nucleating a thermodynamically stable phase, has been widely observed in many solid-state reactions. Among the advantages of two-step nucleation is that the stable phase may nucleate heterogeneously at the hetero-phase interface between the original and the precursory phases. Nevertheless, our understanding of HN at these interfaces remains incomplete. This deficiency stems from the discontinuity of the chemical potential across the hetero-phase interface, which profoundly affects the fundamental properties of the nucleus in a way that is not properly captured in existing models. Herein, we incorporate these effects to extend the classical nucleation theory to HN at hetero-phase interfaces and demonstrate that the nucleus shape along the minimum energy path is strongly size-dependent, and this additional degree- -of-freedom can result in the reduction of the critical nucleus volume and associated nucleation barrier by orders of magnitude relative to conventional predictions.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

3-dimensional Observation of Bainite from Austenite Grain Boundary in 0.6wt% Carbon Steel.
Critical Nuclei at Hetero-phase Interfaces
Effect of Cooling Rate and Austenitic Grain Size on the Austenite Decomposition Kinetics in a Low- carbon Steel
Formation of the γ’’’-Ni2(Cr, Mo, W) Phase during Two-step Heat Treatment in Haynes® 244® Alloy
Identification of Critical Nucleation Events by the Gromov-Wasserstein Distance
Investigation of Nucleation Mechanisms Associated with the Formation of Coprecipitates in Ni-based Superalloys
Modeling Microstructure Evolution Using the Steepest-entropy-ascent Quantum Thermodynamic Framework
Observing the Solid-state Processes under Additive Manufacturing Conditions Inside the TEM
P1-28: Structure Influenced Rapid Hydrogenation Using Metal-acid Contacts on Crystallographically Oriented VO2 Thin Films

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