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Coexistence pressure for a martensitic transformation from theory and experiment: Revisiting the bcc-hcp transition of iron under pressure
Physical Review B
  • Nikolai A. Zarkevich, Ames Laboratory
  • Duane D. Johnson, Iowa State University
Document Type
Article
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.

Comments

This article is from Physical Review B 91 (2015): 174104, doi:10.1103/PhysRevB.91.174104. Posted with permission.

Copyright Owner
American Physical Society
Language
en
Date Available
2015-05-20
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/duane_johnson/10/