We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Observation of Fundamental Mechanisms in Compression-Induced Phase Transformations Using Ultrafast X-ray Diffraction.
- Authors
Armstrong, Michael R.; Radousky, Harry B.; Austin, Ryan A.; Stavrou, Elissaios; Zong, Hongxiang; Ackland, Graeme J.; Brown, Shaughnessy; Crowhurst, Jonathan C.; Gleason, Arianna E.; Granados, Eduardo; Grivickas, Paulius; Holtgrewe, Nicholas; Lee, Hae Ja; Li, Tian T.; Lobanov, Sergey; McKeown, Joseph T.; Nagler, Bob; Nam, Inhyuk; Nelson, Art J.; Prakapenka, Vitali
- Abstract
As theoretically hypothesized for several decades in group IV transition metals, we have discovered a dynamically stabilized body-centered cubic (bcc) intermediate state in Zr under uniaxial loading at sub-nanosecond timescales. Under ultrafast shock wave compression, rather than the transformation from α-Zr to the more disordered hex-3 equilibrium ω-Zr phase, in its place we find the formation of a previously unobserved nonequilibrium bcc metastable intermediate. We probe the compression-induced phase transition pathway in zirconium using time-resolved sub-picosecond x-ray diffraction analysis at the Linac Coherent Light Source. We also present molecular dynamics simulations using a potential derived from first-principles methods which independently predict this intermediate phase under ultrafast shock conditions. In contrast with experiments on longer timescale (> 10 ns) where the phase diagram alone is an adequate predictor of the crystalline structure of a material, our recent study highlights the importance of metastability and time dependence in the kinetics of phase transformations.
- Subjects
PHASE transitions; X-ray diffraction; LONGITUDINAL waves; PHASE diagrams; MOLECULAR dynamics
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2021, Vol 73, Issue 7, p2185
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-020-04535-4