Shock and Microstructural Characterization of the α-ω Phase Transition in Titanium Crystals
Journal Article
·
· Journal of Dynamic Behavior of Materials
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
In this paper, a multicrystal comprised of a small number of large crystals of high-purity titanium and a oriented high-purity single crystal titanium sample were shock loaded using gas gun plate impact experiments. Tests were performed at stresses above the 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 crystal showed a higher Hugoniot elastic limit than the or orientations. The slope of velocity as a function of time was lower in the orientation than the other orientations during plastic deformation, indicating sluggish transformation kinetics for the α to ω phase transition for the oriented crystal. Finally, microtexture measurements of a recovered 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.
- Research Organization:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1458953
- Report Number(s):
- LA-UR--16-29363
- Journal Information:
- Journal of Dynamic Behavior of Materials, Journal Name: Journal of Dynamic Behavior of Materials Journal Issue: 4 Vol. 3; ISSN 2199-7446
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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