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Title: Pressure and Temperature effects on the High Pressure Phase Transformation in Zirconium

Abstract

At high pressure zirconium is known to undergo a phase transformation from the hexagonal close packed (HCP) alpha phase ({alpha}) to the simple hexagonal omega phase ({omega}). Under conditions of shock loading, the high-pressure omega phase is retained upon release. However, the hysteresis in this transformation is not well represented by equilibrium phase diagrams. For this reason, the influence of peak shock pressure and temperature on the retention of omega phase in Zr is explored in this study. In situ VISAR measurements along with post-mortem metallographic and neutron diffraction characterization of soft recovered specimens have been utilized to quantify the volume fraction of retained omega phase, morphology of the shocked alpha and omega phases, and qualitatively understand the kinetics of this transformation. This understanding of the role of peak shock stress will be utilized to address physics to be encoded in our present macro-scale models.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1044128
Report Number(s):
LA-UR-12-22375
TRN: US201214%%326
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: Gordon Research Seminar: Research at High Pressure ; 2012-06-23 - 2012-06-24 ; Biddeford, Maine, United States
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; HCP LATTICES; HYSTERESIS; KINETICS; MORPHOLOGY; NEUTRON DIFFRACTION; PHASE DIAGRAMS; PHASE TRANSFORMATIONS; PHYSICS; RETENTION; TEMPERATURE DEPENDENCE; TRANSFORMATIONS; ZIRCONIUM

Citation Formats

Escobedo-Diaz, Juan P., Cerreta, Ellen K., Brown, Donald W., Trujillo, Carl P., Rigg, Paulo A., Bronkhorst, Curt A., Addessio, Francis L., and Lookman, Turab. Pressure and Temperature effects on the High Pressure Phase Transformation in Zirconium. United States: N. p., 2012. Web.
Escobedo-Diaz, Juan P., Cerreta, Ellen K., Brown, Donald W., Trujillo, Carl P., Rigg, Paulo A., Bronkhorst, Curt A., Addessio, Francis L., & Lookman, Turab. Pressure and Temperature effects on the High Pressure Phase Transformation in Zirconium. United States.
Escobedo-Diaz, Juan P., Cerreta, Ellen K., Brown, Donald W., Trujillo, Carl P., Rigg, Paulo A., Bronkhorst, Curt A., Addessio, Francis L., and Lookman, Turab. Wed . "Pressure and Temperature effects on the High Pressure Phase Transformation in Zirconium". United States. https://www.osti.gov/servlets/purl/1044128.
@article{osti_1044128,
title = {Pressure and Temperature effects on the High Pressure Phase Transformation in Zirconium},
author = {Escobedo-Diaz, Juan P. and Cerreta, Ellen K. and Brown, Donald W. and Trujillo, Carl P. and Rigg, Paulo A. and Bronkhorst, Curt A. and Addessio, Francis L. and Lookman, Turab},
abstractNote = {At high pressure zirconium is known to undergo a phase transformation from the hexagonal close packed (HCP) alpha phase ({alpha}) to the simple hexagonal omega phase ({omega}). Under conditions of shock loading, the high-pressure omega phase is retained upon release. However, the hysteresis in this transformation is not well represented by equilibrium phase diagrams. For this reason, the influence of peak shock pressure and temperature on the retention of omega phase in Zr is explored in this study. In situ VISAR measurements along with post-mortem metallographic and neutron diffraction characterization of soft recovered specimens have been utilized to quantify the volume fraction of retained omega phase, morphology of the shocked alpha and omega phases, and qualitatively understand the kinetics of this transformation. This understanding of the role of peak shock stress will be utilized to address physics to be encoded in our present macro-scale models.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {6}
}

Conference:
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