Hydrogen penetration into the NiTi superelastic alloy investigated in-situ by synchrotron diffraction experiments

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Hydrogen penetration into the NiTi superelastic alloy investigated in-situ by synchrotron diffraction experiments. / Weiser, Adam; Todt, Juraj; Holcova, Jitka et al.
in: Acta materialia, Jahrgang 277.2024, Nr. 15 September, 120217, 23.07.2024.

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

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@article{231c09ef21a34beeabc9b441480f73fa,
title = "Hydrogen penetration into the NiTi superelastic alloy investigated in-situ by synchrotron diffraction experiments",
abstract = "Microstructural changes induced by a hydrogen permeation into the NiTi superelastic alloy were investigated in-situ using the X-ray synchrotron diffraction. A new design of an electrochemical cell enabled to uncover time and position dependent processes under a flat alloy surface exposed to the cathodic hydrogen. The diffraction data supported by thermo-elastic FEM calculations helped to quantify an evolution of compressive stresses in the B2 austenitic phase hosting hydrogen atoms. The compressive stress state initiates a formation of martensitic phases starting from the exposed surface layer and advancing into the alloy volume with increasing time of hydrogen charging. We have performed the ab-initio DFT study in order to rationalize volumetric changes associated with variations in the B2 austenite and B19′ martensite lattice parameters. The numerical results also contributed to the identification of a new hydride phase with orthorhombic crystal structure and lattice parameters a = 0.8505 nm, b = 0.7366 nm and c = 0.4722 nm.",
author = "Adam Weiser and Juraj Todt and Jitka Holcova and Tomas Zalezak and Anna Paulik and David Holec and Milan Jary and Ondrej Zobac and Jan Mrazek and Jan Frenzel and Jozef Keckes and Antonin Dlouh{\'y}",
year = "2024",
month = jul,
day = "23",
doi = "10.1016/j.actamat.2024.120217",
language = "English",
volume = "277.2024",
journal = "Acta materialia",
issn = "1359-6454",
publisher = "Elsevier",
number = "15 September",

}

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TY - JOUR

T1 - Hydrogen penetration into the NiTi superelastic alloy investigated in-situ by synchrotron diffraction experiments

AU - Weiser, Adam

AU - Todt, Juraj

AU - Holcova, Jitka

AU - Zalezak, Tomas

AU - Paulik, Anna

AU - Holec, David

AU - Jary, Milan

AU - Zobac, Ondrej

AU - Mrazek, Jan

AU - Frenzel, Jan

AU - Keckes, Jozef

AU - Dlouhý, Antonin

PY - 2024/7/23

Y1 - 2024/7/23

N2 - Microstructural changes induced by a hydrogen permeation into the NiTi superelastic alloy were investigated in-situ using the X-ray synchrotron diffraction. A new design of an electrochemical cell enabled to uncover time and position dependent processes under a flat alloy surface exposed to the cathodic hydrogen. The diffraction data supported by thermo-elastic FEM calculations helped to quantify an evolution of compressive stresses in the B2 austenitic phase hosting hydrogen atoms. The compressive stress state initiates a formation of martensitic phases starting from the exposed surface layer and advancing into the alloy volume with increasing time of hydrogen charging. We have performed the ab-initio DFT study in order to rationalize volumetric changes associated with variations in the B2 austenite and B19′ martensite lattice parameters. The numerical results also contributed to the identification of a new hydride phase with orthorhombic crystal structure and lattice parameters a = 0.8505 nm, b = 0.7366 nm and c = 0.4722 nm.

AB - Microstructural changes induced by a hydrogen permeation into the NiTi superelastic alloy were investigated in-situ using the X-ray synchrotron diffraction. A new design of an electrochemical cell enabled to uncover time and position dependent processes under a flat alloy surface exposed to the cathodic hydrogen. The diffraction data supported by thermo-elastic FEM calculations helped to quantify an evolution of compressive stresses in the B2 austenitic phase hosting hydrogen atoms. The compressive stress state initiates a formation of martensitic phases starting from the exposed surface layer and advancing into the alloy volume with increasing time of hydrogen charging. We have performed the ab-initio DFT study in order to rationalize volumetric changes associated with variations in the B2 austenite and B19′ martensite lattice parameters. The numerical results also contributed to the identification of a new hydride phase with orthorhombic crystal structure and lattice parameters a = 0.8505 nm, b = 0.7366 nm and c = 0.4722 nm.

U2 - 10.1016/j.actamat.2024.120217

DO - 10.1016/j.actamat.2024.120217

M3 - Article

VL - 277.2024

JO - Acta materialia

JF - Acta materialia

SN - 1359-6454

IS - 15 September

M1 - 120217

ER -