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Title: The α–ω phase transition in shock-loaded titanium

Abstract

Here, we present a series of experiments probing the martensitic α–ω (hexagonal close-packed to simple hexagonal) transition in titanium under shock-loading to peak stresses around 15 GPa. Gas-gun plate impact techniques were used to locate the α–ω transition stress with a laser-based velocimetry diagnostic. A change in the shock-wave profile at 10.1 GPa suggests the transition begins at this stress. A second experiment shock-loaded and then soft-recovered a similar titanium sample. We then analyzed this recovered material with electron-backscatter diffraction methods, revealing on average approximately 65% retained ω phase. Furthermore, based on careful analysis of the microstructure, we propose that the titanium never reached a full ω state, and that there was no observed phase-reversion from ω to α. Texture analysis suggests that any α titanium found in the recovered sample is the original α. The data show that both the α and ω phases are stable and can coexist even though the shock-wave presents as steady-state, at these stresses.

Authors:
 [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1374352
Alternate Identifier(s):
OSTI ID: 1372949
Report Number(s):
LA-UR-17-22453
Journal ID: ISSN 0021-8979
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 122; Journal Issue: 4; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Titanium, Shock Loading, Phase Transition

Citation Formats

Jones, David R., Morrow, Benjamin M., Trujillo, Carl P., Gray, George T., and Cerreta, Ellen K. The α–ω phase transition in shock-loaded titanium. United States: N. p., 2017. Web. doi:10.1063/1.4987146.
Jones, David R., Morrow, Benjamin M., Trujillo, Carl P., Gray, George T., & Cerreta, Ellen K. The α–ω phase transition in shock-loaded titanium. United States. doi:10.1063/1.4987146.
Jones, David R., Morrow, Benjamin M., Trujillo, Carl P., Gray, George T., and Cerreta, Ellen K. Fri . "The α–ω phase transition in shock-loaded titanium". United States. doi:10.1063/1.4987146.
@article{osti_1374352,
title = {The α–ω phase transition in shock-loaded titanium},
author = {Jones, David R. and Morrow, Benjamin M. and Trujillo, Carl P. and Gray, George T. and Cerreta, Ellen K.},
abstractNote = {Here, we present a series of experiments probing the martensitic α–ω (hexagonal close-packed to simple hexagonal) transition in titanium under shock-loading to peak stresses around 15 GPa. Gas-gun plate impact techniques were used to locate the α–ω transition stress with a laser-based velocimetry diagnostic. A change in the shock-wave profile at 10.1 GPa suggests the transition begins at this stress. A second experiment shock-loaded and then soft-recovered a similar titanium sample. We then analyzed this recovered material with electron-backscatter diffraction methods, revealing on average approximately 65% retained ω phase. Furthermore, based on careful analysis of the microstructure, we propose that the titanium never reached a full ω state, and that there was no observed phase-reversion from ω to α. Texture analysis suggests that any α titanium found in the recovered sample is the original α. The data show that both the α and ω phases are stable and can coexist even though the shock-wave presents as steady-state, at these stresses.},
doi = {10.1063/1.4987146},
journal = {Journal of Applied Physics},
number = 4,
volume = 122,
place = {United States},
year = {Fri Jul 28 00:00:00 EDT 2017},
month = {Fri Jul 28 00:00:00 EDT 2017}
}

Journal Article:
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