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Title: Impurity Effects on the Phase Transformations and Equations of State of Zirconium Metals

Abstract

The in situ high P-T X-ray diffraction experiments were conducted at pressures up to 17 GPa and temperatures up to 1273 K to study the phase transformations and equations of state for two grades of zirconium metals. At ambient temperature, our results reveal significant differences in both the transition pressure and kinetics of the {alpha}-{omega} phase transformation between the ultra-pure Zr (35 ppm Hf and <50 ppm O) and impure Zr (1.03 at% Hf and 4.5 at% O). These observations indicate that impurities, particularly oxygen ions, play important roles in the transformation mechanisms as well as crystal stability. On the other hand, impurities have no measurable effects on either the elastic bulk moduli of both {alpha} and {omega} phases or the volume change across the {alpha}-{omega} phase transformation. At elevated temperature, both impure and ultra-pure Zr show similar transition temperatures for the {omega}-{beta} phase boundary over a pressure range of 6-16 GPa, suggesting that impure oxygen and hafnium ions can only be an {alpha}-Zr stabilizer; they do not seem to significantly increase the stability of the {omega}-Zr relative to the {beta}-Zr.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
959904
Report Number(s):
BNL-82890-2009-JA
Journal ID: ISSN 0022-3697; JPCSAW; TRN: US1005829
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physics and Chemistry of Solids; Journal Volume: 68; Journal Issue: 12
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; AMBIENT TEMPERATURE; EQUATIONS OF STATE; HAFNIUM IONS; IMPURITIES; KINETICS; OXYGEN; OXYGEN IONS; PHASE TRANSFORMATIONS; PRESSURE RANGE; STABILITY; TRANSFORMATIONS; TRANSITION TEMPERATURE; X-RAY DIFFRACTION; ZIRCONIUM; national synchrotron light source

Citation Formats

Zhang,J., Zhao, Y., Rigg, P., Hoxson, R., and Gray lll, G. Impurity Effects on the Phase Transformations and Equations of State of Zirconium Metals. United States: N. p., 2007. Web. doi:10.1016/j.jpcs.2007.06.016.
Zhang,J., Zhao, Y., Rigg, P., Hoxson, R., & Gray lll, G. Impurity Effects on the Phase Transformations and Equations of State of Zirconium Metals. United States. doi:10.1016/j.jpcs.2007.06.016.
Zhang,J., Zhao, Y., Rigg, P., Hoxson, R., and Gray lll, G. Mon . "Impurity Effects on the Phase Transformations and Equations of State of Zirconium Metals". United States. doi:10.1016/j.jpcs.2007.06.016.
@article{osti_959904,
title = {Impurity Effects on the Phase Transformations and Equations of State of Zirconium Metals},
author = {Zhang,J. and Zhao, Y. and Rigg, P. and Hoxson, R. and Gray lll, G.},
abstractNote = {The in situ high P-T X-ray diffraction experiments were conducted at pressures up to 17 GPa and temperatures up to 1273 K to study the phase transformations and equations of state for two grades of zirconium metals. At ambient temperature, our results reveal significant differences in both the transition pressure and kinetics of the {alpha}-{omega} phase transformation between the ultra-pure Zr (35 ppm Hf and <50 ppm O) and impure Zr (1.03 at% Hf and 4.5 at% O). These observations indicate that impurities, particularly oxygen ions, play important roles in the transformation mechanisms as well as crystal stability. On the other hand, impurities have no measurable effects on either the elastic bulk moduli of both {alpha} and {omega} phases or the volume change across the {alpha}-{omega} phase transformation. At elevated temperature, both impure and ultra-pure Zr show similar transition temperatures for the {omega}-{beta} phase boundary over a pressure range of 6-16 GPa, suggesting that impure oxygen and hafnium ions can only be an {alpha}-Zr stabilizer; they do not seem to significantly increase the stability of the {omega}-Zr relative to the {beta}-Zr.},
doi = {10.1016/j.jpcs.2007.06.016},
journal = {Journal of Physics and Chemistry of Solids},
number = 12,
volume = 68,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}