Path dependency of phase transformations
Abstract
At high pressures titanium and zirconium are known to undergo a phase transformation from the hexagonal close packed (HCP), alpha-phase to the simple-hexagonal, omega-phase. Under conditions of shock loading, the high-pressure omega-phase can be retained upon release. It has been shown that temperature, peak shock stress, and texture can influence the transformation. Moreover, under these same loading conditions, plastic processes of slip and twinning are also affected by similar differences in the loading path. To understand this path dependency and it role on microstructural evolution, in-situ velocimetry measurements along with post-mortem metallographic and neutron diffraction characterization of soft recovered specimens have been utilized to qualitatively understand the kinetics of transformation, quantify volume fraction of retained omega-phase and characterize the shocked alpha and omega-phases. Together the work described here can be utilized to understand phase and structure for these metals and lend insight into the partitioning of plastic processes between phases far from equilibrium conditions. Experiments discussed here, reveal that the transformation from alpha to omega phase is more difficult in Ti than in Zr metals. This result is discussed in terms of both differences in shear modulus and free space within the lattice for these systems.
- Authors:
-
[1];
[1];
[1];
[1];
[1];
[1];
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Washington State Univ., Pullman, WA (United States)
- 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:
- 1601386
- Report Number(s):
- LA-UR-17-27958
Journal ID: ISSN 0094-243X; TRN: US2103725
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- AIP Conference Proceedings
- Additional Journal Information:
- Journal Volume: 1979; Conference: 20.Biennial APS Conference on Shock Compression of Condensed Matter (SCCM-2017), St. Louis, MO (United States), 9-14 Jul 2017; Journal ID: ISSN 0094-243X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Cerreta, Ellen Kathleen, Addessio, Francis L., Bronkhorst, Curt Allan, Jones, David Robert, Lookman, Turab, Martinez, Daniel Tito, Morrow, Benjamin Mark, Rigg, Paulo A, and Trujillo, Carl Patrick. Path dependency of phase transformations. United States: N. p., 2018.
Web. doi:10.1063/1.5044798.
Cerreta, Ellen Kathleen, Addessio, Francis L., Bronkhorst, Curt Allan, Jones, David Robert, Lookman, Turab, Martinez, Daniel Tito, Morrow, Benjamin Mark, Rigg, Paulo A, & Trujillo, Carl Patrick. Path dependency of phase transformations. United States. https://doi.org/10.1063/1.5044798
Cerreta, Ellen Kathleen, Addessio, Francis L., Bronkhorst, Curt Allan, Jones, David Robert, Lookman, Turab, Martinez, Daniel Tito, Morrow, Benjamin Mark, Rigg, Paulo A, and Trujillo, Carl Patrick. Wed .
"Path dependency of phase transformations". United States. https://doi.org/10.1063/1.5044798. https://www.osti.gov/servlets/purl/1601386.
@article{osti_1601386,
title = {Path dependency of phase transformations},
author = {Cerreta, Ellen Kathleen and Addessio, Francis L. and Bronkhorst, Curt Allan and Jones, David Robert and Lookman, Turab and Martinez, Daniel Tito and Morrow, Benjamin Mark and Rigg, Paulo A and Trujillo, Carl Patrick},
abstractNote = {At high pressures titanium and zirconium are known to undergo a phase transformation from the hexagonal close packed (HCP), alpha-phase to the simple-hexagonal, omega-phase. Under conditions of shock loading, the high-pressure omega-phase can be retained upon release. It has been shown that temperature, peak shock stress, and texture can influence the transformation. Moreover, under these same loading conditions, plastic processes of slip and twinning are also affected by similar differences in the loading path. To understand this path dependency and it role on microstructural evolution, in-situ velocimetry measurements along with post-mortem metallographic and neutron diffraction characterization of soft recovered specimens have been utilized to qualitatively understand the kinetics of transformation, quantify volume fraction of retained omega-phase and characterize the shocked alpha and omega-phases. Together the work described here can be utilized to understand phase and structure for these metals and lend insight into the partitioning of plastic processes between phases far from equilibrium conditions. Experiments discussed here, reveal that the transformation from alpha to omega phase is more difficult in Ti than in Zr metals. This result is discussed in terms of both differences in shear modulus and free space within the lattice for these systems.},
doi = {10.1063/1.5044798},
journal = {AIP Conference Proceedings},
number = ,
volume = 1979,
place = {United States},
year = {Wed Jan 03 00:00:00 EST 2018},
month = {Wed Jan 03 00:00:00 EST 2018}
}
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