Stability of incommensurately modulated Ni50Mn27Ga22Fe1 10M martensite under uniaxial tensile stress
Loading...
Date
2024-07-01
Authors
Vinogradova, Mariia
Sozinov, Alexei
Straka, Ladislav
Veřtát, Petr
Heczko, Oleg
Zelený, Martin
Chulist, Robert
Ullakko, Kari
ORCID
0000-0001-6715-4088Advisor
Referee
Mark
Journal Title
Journal ISSN
Volume Title
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Altmetrics
Abstract
We investigate the incommensurately modulated crystal structure in the Ni50Mn27Ga22Fe1 magnetic shape memory alloy. We focus on temperature- and stress-induced changes, particularly measuring the a and b lattice parameters and the monoclinic angle. The in-situ XRD experiment shows that the thermally-induced commensurate-incommensurate (C-IC) transition coincides with the change of the average lattice symmetry from monoclinic to orthorhombic. The thermally-induced IC structure is stable under uniaxial tensile stress along the a-axis for deformation epsilon < 0.8 %. A mixture of the IC and C structures appears for epsilon > 0.8 % and the changes become irreversible. The volume fraction of the C structure further increases with increasing deformation. These results provide vital initial insights into the structural evolution of Ni-Mn-Ga alloys and enable us to establish the role of C and IC structures in their extraordinarily high mobility of twin boundaries.
Description
Citation
SCRIPTA MATERIALIA. 2024, vol. 247, issue -, p. 116096--.
https://www.sciencedirect.com/science/article/pii/S1359646224001325
https://www.sciencedirect.com/science/article/pii/S1359646224001325
Document type
Peer-reviewed
Document version
Published version
Date of access to the full text
Language of document
en