The α–ω phase transition in shock-loaded titanium

Jones, David R.; Morrow, Benjamin M.; Trujillo, Carl P.; Gray, George T.; Cerreta, Ellen K.

doi:10.1063/1.4987146

The α–ω phase transition in shock-loaded titanium

Journal Article · Fri Jul 28 00:00:00 EDT 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4987146· OSTI ID:1374352

Jones, David R. ^[1]; ^[1]; Trujillo, Carl P. ^[1]; ^[1]; Cerreta, Ellen K. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1374352

Alternate ID(s):: OSTI ID: 1372949

Report Number(s):: LA-UR-17-22453

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 4 Vol. 122; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Metastable ω′-Fe ₃ C carbide formed during ω-Fe ₃ C particle coarsening in binary Fe-C alloys Ping, D. H.; Xiang, H. P.; Liu, X. Journal of Applied Physics, Vol. 125, Issue 17 https://doi.org/10.1063/1.5091935	journal	May 2019
Shock induced plasticity and phase transition in single crystal lead by molecular dynamics simulations Li, Guomeng; Wang, Yabin; Wang, Kun Journal of Applied Physics, Vol. 126, Issue 7 https://doi.org/10.1063/1.5097621	journal	August 2019

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36 MATERIALS SCIENCE
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The α–ω phase transition in shock-loaded titanium

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