A1 Journal article (refereed), original research

Composition and temperature dependence of twinning stress in non-modulated martensite of Ni-Mn-Ga-Co-Cu magnetic shape memory alloys


LUT Authors / Editors

Publication Details
Authors: Soroka Aleksandr, Sozinov Alexei, Lanska Nataliya, Rameš Michal, Straka Ladislav, Ullakko Kari
Publisher: Elsevier
Publication year: 2017
Language: English
Related Journal or Series Information: Scripta Materialia
Volume number: 144
Start page: 52
End page: 55
Number of pages: 4
ISSN: 1359-6462
eISSN: 1872-8456
JUFO-Level of this publication: 3
Open Access: Not an Open Access publication

Abstract

We study compositional and thermal dependences of lattice parameters and twinning stress σTW in
Ni50-xMn25-yGa25-zCoxCuy+z magnetic shape memory alloys with non-modulated tetragonal crystal structure.
The σTW was found to decrease with increasing temperature with a slope from −0.0076 to −0.0181 MPa/K. The
σTW=0.47–0.81 MPa values measured near composition-specific austenite transformation temperatures TA were discovered to depend linearly on the c/a ratio with a slope of 14 MPa. We predict that the further decrease of c/a ratio to the level of 1.085–1.104 can result in extremely low σTW ≈ 0.1 MPa in non-modulated martensite.


Research Areas

Last updated on 2018-19-10 at 07:55