Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K20: Matter at Extreme Conditions: Material Response and Phase Transitions
3:00 PM–5:48 PM,
Tuesday, March 5, 2024
Room: M101ABC
Sponsoring
Units:
GCCM DCOMP DMP
Chair: Seokbin Lim, New Mexico Institute of Mining and Technology
Abstract: K20.00009 : Time-Resolved Transformation Kinetics of the BCC to HCP Transition in Iron Using Piezo- Driven Compression*
4:36 PM–4:48 PM
Presenter:
John A Copley
(Princeton University)
Authors:
John A Copley
(Princeton University)
Guoyin Shen
(Argonne National Laboratory)
Jesse S Smith
(Argonne National Laboratory)
Thomas S Duffy
(Princeton University)
The results are examined in an Avrami framework, where phase evolution is determined by the interplay of nucleation, growth, and impingement. We assess the suitability of the Avrami equation for the high-pressure phase transformation in iron, discuss what differentiates high-pressure experiments from more conventional studies, and develop a new model which allows for non-standard impingement processes that is also more suited to high-pressure experiments. With the development of a kinetic law for high-pressure transformations, future studies may more directly constrain kinetic parameters, such as nucleation rate, that are currently difficult to assess experimentally.
*This work was supported by Princeton University, the Stewardship Science Graduate Fellowship, the National Nuclear Security Administration, the High-Pressure Collaborative Access Team at Argonne National Laboratory and the United States Department of Energy.
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