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Observation of Fundamental Mechanisms in Compression-Induced Phase Transformations Using Ultrafast X-ray Diffraction

Urheber*innen

Armstrong,  Michael R.
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Radousky,  Harry B.
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Austin,  Ryan A.
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Stavrou,  Elissaios
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Zong,  Hongxiang
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Ackland,  Graeme J.
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Brown,  Shaughnessy
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Crowhurst,  Jonathan C.
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Gleason,  Arianna E.
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Granados,  Eduardo
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Grivickas,  Paulius
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Holtgrewe,  Nicholas
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Lee,  Hae Ja
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Li,  Tian T.
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/persons/resource/slobanov

Lobanov,  S. S.
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

McKeown,  Joseph T.
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Nagler,  Bob
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Nam,  Inhyuk
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Nelson,  Art J.
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Prakapenka,  Vitali
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Prescher,  Clemens
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Roehling,  John D.
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Teslich,  Nick E.
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Walter,  Peter
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Goncharov,  Alexander F.
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Belof,  Jonathan L.
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Zitation

Armstrong, M. R., Radousky, H. B., Austin, R. A., Stavrou, E., Zong, H., Ackland, G. J., Brown, S., Crowhurst, J. C., Gleason, A. E., Granados, E., Grivickas, P., Holtgrewe, N., Lee, H. J., Li, T. T., Lobanov, S. S., McKeown, J. T., Nagler, B., Nam, I., Nelson, A. J., Prakapenka, V., Prescher, C., Roehling, J. D., Teslich, N. E., Walter, P., Goncharov, A. F., Belof, J. L. (2021): Observation of Fundamental Mechanisms in Compression-Induced Phase Transformations Using Ultrafast X-ray Diffraction. - JOM, 73, 2185-2193.
https://doi.org/10.1007/s11837-020-04535-4


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5005410
Zusammenfassung
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 a-Zr to the more disordered hex-3 equilibrium x-Zr phase, in its place we find the formation of a previously unobserved nonequilibrium bcc metastable in- termediate. 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 simula- tions using a potential derived from first-principles methods which indepen- dently 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.