Article
Coexistence pressure for a martensitic transformation from theory and experiment: Revisiting the bcc-hcp transition of iron under pressure
Physical Review B
Document Type
Article
Disciplines
Publication Version
Published Version
Publication Date
5-12-2015
DOI
10.1103/PhysRevB.91.174104
Abstract
The coexistence pressure of two phases is a well-defined point at fixed temperature. In experiment, however, due to nonhydrostatic stresses and a stress-dependent potential energy barrier, different measurements yield different ranges of pressure with a hysteresis. Accounting for these effects, we propose an inequality for comparison of the theoretical value to a plurality of measured intervals. We revisit decades of pressure experiments on the bcc↔hcp transformations in iron, which are sensitive to nonhydrostatic conditions and sample size. From electronic-structure calculations, we find a bcc↔hcp coexistence pressure of 8.4GPa. We construct the equation of state for competing phases under hydrostatic pressure, compare to experiments and other calculations, and address the observed pressure hysteresis and range of onset pressures of the nucleating phase.
Copyright Owner
American Physical Society
Copyright Date
2015
Language
en
File Format
application/pdf
Citation Information
Nikolai A. Zarkevich and Duane D. Johnson. "Coexistence pressure for a martensitic transformation from theory and experiment: Revisiting the bcc-hcp transition of iron under pressure" Physical Review B Vol. 91 Iss. 17 (2015) p. 174104 Available at: http://works.bepress.com/nikolai_zarkevich/15/
This article is from Physical Review B 91 (2015): 174104, doi:10.1103/PhysRevB.91.174104. Posted with permission.