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Title: Dynamic Reflectance of Tin Shocked from Its Beta to BCT Phase

Abstract

Shock-induced phase transitions have historically been inferred by features in loading/unloading velocity wave profiles, which arise due to volume or sound speed differences between phases. In 2010, we used a flash-lampilluminated ultiband reflectometer to demonstrate that iron, tin, cerium, and gallium have measureable reflectance changes at phase boundaries. We have improved upon our prior technique, utilizing an integrating sphere with an internal xenon flash lamp to illuminate a shocked metal beneath a LiF window. The new reflectance system is insensitive to motion, tilt, or curvature and measures the absolute reflectance within five bands centered at 500, 700, 850, 1064, 1300, and 1550 nm. We have made dynamic reflectance measurements of tin samples shocked to pressures above and below the beta-BCT phase transition using a light gas gun. Below the transition, the visible reflectance decreases with pressure. At and above the transition, the visible reflectance increases to values higher than the ambient values. Reflectance can therefore be used to locate the beta-BCT phase transition boundary for tin, independent of the velocity wave profile. Using the reflectance data, we also present experimental estimates of the phase fraction as a function of shock stress.

Authors:
 [1];  [1];  [1];  [1]
  1. Special Technologies Lab. (STL), Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Nevada Test Site/National Security Technologies, LLC (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1240152
Report Number(s):
DOE/NV/25946-2514
DOE Contract Number:  
DE-AC52-06NA25946
Resource Type:
Conference
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1793; Journal Issue: 1; Conference: American Physical Society Shock Compression of Condensed Matter Conference Tampa, FL June 14 - 19, 2015 http://www.aps.org/meetings/meeting.cfm?name=SHOCK15
Country of Publication:
United States
Language:
English

Citation Formats

Stevens, Gerald D., La Lone, Brandon M., Turley, William Dale, and Veeser, Lynn R. Dynamic Reflectance of Tin Shocked from Its Beta to BCT Phase. United States: N. p., 2015. Web. doi:10.1063/1.4971713.
Stevens, Gerald D., La Lone, Brandon M., Turley, William Dale, & Veeser, Lynn R. Dynamic Reflectance of Tin Shocked from Its Beta to BCT Phase. United States. doi:10.1063/1.4971713.
Stevens, Gerald D., La Lone, Brandon M., Turley, William Dale, and Veeser, Lynn R. Mon . "Dynamic Reflectance of Tin Shocked from Its Beta to BCT Phase". United States. doi:10.1063/1.4971713. https://www.osti.gov/servlets/purl/1240152.
@article{osti_1240152,
title = {Dynamic Reflectance of Tin Shocked from Its Beta to BCT Phase},
author = {Stevens, Gerald D. and La Lone, Brandon M. and Turley, William Dale and Veeser, Lynn R.},
abstractNote = {Shock-induced phase transitions have historically been inferred by features in loading/unloading velocity wave profiles, which arise due to volume or sound speed differences between phases. In 2010, we used a flash-lampilluminated ultiband reflectometer to demonstrate that iron, tin, cerium, and gallium have measureable reflectance changes at phase boundaries. We have improved upon our prior technique, utilizing an integrating sphere with an internal xenon flash lamp to illuminate a shocked metal beneath a LiF window. The new reflectance system is insensitive to motion, tilt, or curvature and measures the absolute reflectance within five bands centered at 500, 700, 850, 1064, 1300, and 1550 nm. We have made dynamic reflectance measurements of tin samples shocked to pressures above and below the beta-BCT phase transition using a light gas gun. Below the transition, the visible reflectance decreases with pressure. At and above the transition, the visible reflectance increases to values higher than the ambient values. Reflectance can therefore be used to locate the beta-BCT phase transition boundary for tin, independent of the velocity wave profile. Using the reflectance data, we also present experimental estimates of the phase fraction as a function of shock stress.},
doi = {10.1063/1.4971713},
journal = {AIP Conference Proceedings},
number = 1,
volume = 1793,
place = {United States},
year = {2015},
month = {6}
}

Conference:
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Works referenced in this record:

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journal, June 2010

  • Stevens, G. D.; Turley, W. D.; Veeser, L. R.
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