Hydrogen penetration into the NiTi superelastic alloy investigated in-situ by synchrotron diffraction experiments
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in: Acta materialia, Jahrgang 277.2024, Nr. 15 September, 120217, 23.07.2024.
Publikationen: Beitrag in Fachzeitschrift › Artikel › Forschung › (peer-reviewed)
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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 -