Structural changes driven by
pulsed magnetic fields: comparison of off-stoichiometric
CoNiGa and (CoNiCu)(AlGaIn) intermetallic
compounds
Chem.
Met. Alloys 12 (2019)
71-76
https://doi.org/10.30970/cma12.0388
Gregory GERSTEIN, Georgiy
FIRSTOV, Tetiana KOSORUKOVA, Yuri KOVAL, Valeriy ODNOSUM, Andrej DALINGER,
Mathieu PASTUREL, Hans Jürgen MAIER
Fine magnetic- and
microstructures in CoNiGa magnetic shape memory alloy
single crystals were generated by applying pulsed magnetic fields of up to 0.7 T.
The effects observed could be attributed to a change in the dynamics of the
interaction process between the magnetic field and the microstructure of the
off-stoichiometric sample. This report addresses the
impact of pulsed magnetic fields on the structure and phase composition in CoNiGa and multicomponent (CoNiCu)(AlGaIn)
alloys. A pulsed magnetic field can result in different microstructural
accommodation processes in stress-induced martensite,
as compared to the application of mechanical stress or a permanent magnetic
field. In a pulsed magnetic field the development of new nano-twin
systems in the martensitic structure of the CoNiGa alloy and the formation of fine magnetic domains at
the microscale, as well as the evolution of this
process, in (CoNiCu)(AlGaIn), were observed. The ramifications of exploiting
pulse magnetic fields for magnetic shape memory in these compounds will be
discussed.
Changing of the martensitic
structure in the (CoNiCu)(AlGaIn) multicomponent intermetallic compound.
Keywords
Ferromagnetic shape
memory alloy / Multicomponent alloy / Twinning / Fatigue
/ Pulsed magnetic field