Strong influence of magnetic field and non-uniform stress on elastic modulus and transition temperatures of twinned Ni–Fe(Co)–Ga alloy

Autor(en)

Anna Kosogor, Viktor Soprunyuk, Sabri Koraltan, Vladimir Golub, Dmytro Velyhotskyi, Volodymyr Chernenko, Hideki Hosoda, Dieter Suess, Wilfried Schranz, Victor A. L’vov

Abstrakt

The magnetization value and electric resistivity of the single-crystalline sample of Ni₅₀Fe₁₉Co₄Ga₂₇ shape memory alloy were measured. The elastic modulus was determined by the Dynamic Mechanical Analysis (DMA). The characteristic temperatures of martensitic transformation (MT) of the alloy were estimated from the temperature dependences of magnetization, electric resistivity and elastic modulus. A significant disparity between MT temperatures resulting from DMA and those estimated from magnetic and resistivity measurements was discovered. It was argued that the discrepancy is caused by the non-uniform mechanical stressing of twinned single crystal by the DMA analyzer. Moreover, the DMA measurements revealed a significant decrease of the elastic modulus of twinned martensite under the applied magnetic field of 1.5 kOe. To explain this effect, the temperature-dependent Young’s modulus of twinned crystal lattice was computed. The computations showed that the experimentally observed field-induced change of the elastic modulus is caused by the stress-assisted detwinning of the crystal lattice by the applied magnetic field.

Organisation(en)

Physik Funktioneller Materialien, Forschungsplattform MMM Mathematics-Magnetism-Materials

Externe Organisation(en)

Institute of Magnetism, Basque Center for Materials, Applications & Nanostructures, Tokyo Institute of Technology, Ikerbasque Basque Foundation for Science

Journal

Scientific Reports

Band

14

Anzahl der Seiten

9

ISSN

2045-2322

DOI

https://doi.org/10.1038/s41598-024-62909-z

Publikationsdatum

12-2024

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus, 103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

General

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/b125211f-6c99-4147-a8ef-351029a3e3ab