Publication detail
Switching the soft shearing mode orientation in Ni-Mn-Ga non-modulated martensite by Co and Cu doping
BODNÁROVÁ, L. ZELENÝ, M. SEDLÁK, P. STRAKA, L. HECZKO, O. SOZINOV, A. SEINER, H
English title
Switching the soft shearing mode orientation in Ni-Mn-Ga non-modulated martensite by Co and Cu doping
Type
journal article in Web of Science
Language
en
Original abstract
Resonant ultrasound spectroscopy measurements and density functional theory calculations were used to analyze the effect of Co and Cu doping (3-6 at. %) on elastic constants of non-modulated martensite of the Ni-Mn-Ga ferromagnetic shape memory alloy. Due to the doping, the studied alloys exhibited decreased tetragonal ratios c/a..1.14. Both the experiments and the calculations revealed that the lowering of the c/a ratio resulted in a change of the orientation of the softest shearing modes of the tetragonal lattice. The newly appearing softest shearing modes for the doped materials have approximately {1 a 0 1 c} bcta-1 a 0 1 cnbct orientations and indicate a lattice instability directly related to the particularly low twinning stress for compound {101} a1
English abstract
Resonant ultrasound spectroscopy measurements and density functional theory calculations were used to analyze the effect of Co and Cu doping (3-6 at. %) on elastic constants of non-modulated martensite of the Ni-Mn-Ga ferromagnetic shape memory alloy. Due to the doping, the studied alloys exhibited decreased tetragonal ratios c/a..1.14. Both the experiments and the calculations revealed that the lowering of the c/a ratio resulted in a change of the orientation of the softest shearing modes of the tetragonal lattice. The newly appearing softest shearing modes for the doped materials have approximately {1 a 0 1 c} bcta-1 a 0 1 cnbct orientations and indicate a lattice instability directly related to the particularly low twinning stress for compound {101} a1
Keywords in English
magnetic shape memory; elastic constants; acoustic methods; ab initio calculations; resonant ultrasound spectroscopy
Released
09.03.2020
Publisher
IOP PUBLISHING LTD
Location
BRISTOL
ISSN
0964-1726
Volume
29
Number
4
Pages from–to
045022–-
Pages count
9
BIBTEX
@article{BUT163259,
author="Martin {Zelený},
title="Switching the soft shearing mode orientation in Ni-Mn-Ga non-modulated martensite by Co and Cu doping",
year="2020",
volume="29",
number="4",
month="March",
pages="045022---",
publisher="IOP PUBLISHING LTD",
address="BRISTOL",
issn="0964-1726"
}