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Title: Shock and Microstructural Characterization of the α-ω Phase Transition in Titanium Crystals

In this paper, a multicrystal comprised of a small number of large crystals of high-purity titanium and a [ 0001 ] oriented high-purity single crystal titanium sample were shock loaded using gas gun plate impact experiments. Tests were performed at stresses above the α ω phase transition stress (for high-purity polycrystalline specimens) to observe the behavior of oriented crystals under similar conditions. Post-mortem characterization of the shocked microstructure was conducted on the single crystal sample to measure textures, and quantify phases and twinning. The apparent activation of plastic and transformation mechanisms was dependent upon crystal orientation. Specifically, the [ 0001 ] crystal showed a higher Hugoniot elastic limit than the [ 10 1 ¯ 0 ] or [ 3 1 ¯ 4 ¯ 4 ] orientations. The slope of velocity as a function of time was lower in the [ 0001 ] orientation than the other orientations during plastic deformation, indicating sluggish transformation kinetics for the α to ω phase transition for the [ 0001 ] oriented crystal. Finally, microtexture measurements of a recovered [ 0001 ] oriented single crystal revealed the presence of retained ω phase after unloading, with orientations of the constituent phase fractions indicative of the forward α→ω transition, rather than the reverse ω→α transition, suggesting that the material never achieved a state of 100% ω phase.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Report Number(s):
LA-UR-16-29363
Journal ID: ISSN 2199-7446
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of Dynamic Behavior of Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 4; Journal ID: ISSN 2199-7446
Publisher:
Springer
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; dynamic compression; titanium; texture; phase transformation
OSTI Identifier:
1458953

Morrow, Benjamin M., Rigg, Paulo A., Jones, David R., Addessio, Francis L., Trujillo, Carl P., Saavedra, Ramon A., Martinez, Daniel T., and Cerreta, Ellen K.. Shock and Microstructural Characterization of the α-ω Phase Transition in Titanium Crystals. United States: N. p., Web. doi:10.1007/s40870-017-0129-z.
Morrow, Benjamin M., Rigg, Paulo A., Jones, David R., Addessio, Francis L., Trujillo, Carl P., Saavedra, Ramon A., Martinez, Daniel T., & Cerreta, Ellen K.. Shock and Microstructural Characterization of the α-ω Phase Transition in Titanium Crystals. United States. doi:10.1007/s40870-017-0129-z.
Morrow, Benjamin M., Rigg, Paulo A., Jones, David R., Addessio, Francis L., Trujillo, Carl P., Saavedra, Ramon A., Martinez, Daniel T., and Cerreta, Ellen K.. 2017. "Shock and Microstructural Characterization of the α-ω Phase Transition in Titanium Crystals". United States. doi:10.1007/s40870-017-0129-z. https://www.osti.gov/servlets/purl/1458953.
@article{osti_1458953,
title = {Shock and Microstructural Characterization of the α-ω Phase Transition in Titanium Crystals},
author = {Morrow, Benjamin M. and Rigg, Paulo A. and Jones, David R. and Addessio, Francis L. and Trujillo, Carl P. and Saavedra, Ramon A. and Martinez, Daniel T. and Cerreta, Ellen K.},
abstractNote = {In this paper, a multicrystal comprised of a small number of large crystals of high-purity titanium and a [ 0001 ] oriented high-purity single crystal titanium sample were shock loaded using gas gun plate impact experiments. Tests were performed at stresses above the α − ω phase transition stress (for high-purity polycrystalline specimens) to observe the behavior of oriented crystals under similar conditions. Post-mortem characterization of the shocked microstructure was conducted on the single crystal sample to measure textures, and quantify phases and twinning. The apparent activation of plastic and transformation mechanisms was dependent upon crystal orientation. Specifically, the [ 0001 ] crystal showed a higher Hugoniot elastic limit than the [ 10 1 ¯ 0 ] or [ 3 1 ¯ 4 ¯ 4 ] orientations. The slope of velocity as a function of time was lower in the [ 0001 ] orientation than the other orientations during plastic deformation, indicating sluggish transformation kinetics for the α to ω phase transition for the [ 0001 ] oriented crystal. Finally, microtexture measurements of a recovered [ 0001 ] oriented single crystal revealed the presence of retained ω phase after unloading, with orientations of the constituent phase fractions indicative of the forward α→ω transition, rather than the reverse ω→α transition, suggesting that the material never achieved a state of 100% ω phase.},
doi = {10.1007/s40870-017-0129-z},
journal = {Journal of Dynamic Behavior of Materials},
number = 4,
volume = 3,
place = {United States},
year = {2017},
month = {9}
}