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:
-
- 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. https://doi.org/10.1063/1.4987146
Jones, David R., Morrow, Benjamin M., Trujillo, Carl P., Gray, George T., and Cerreta, Ellen K. 2017.
"The α–ω phase transition in shock-loaded titanium". United States. https://doi.org/10.1063/1.4987146. https://www.osti.gov/servlets/purl/1374352.
@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},
url = {https://www.osti.gov/biblio/1374352},
journal = {Journal of Applied Physics},
issn = {0021-8979},
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}
}
Web of Science
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Works referencing / citing this record:
Metastable ω′-Fe 3 C carbide formed during ω-Fe 3 C particle coarsening in binary Fe-C alloys
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Shock induced plasticity and phase transition in single crystal lead by molecular dynamics simulations
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