Temperature dependence of martensite structure and its effect on magnetic-field-induced strain in Ni2MnGa magnetic shape memory alloys

Autor:	S. Danilkin, Veikko Lindroos, I. Glavatsky, A. Beskrovnij, G. Mogilniy, N.I. Glavatska, D. Hohlwein
Rok vydání:	2003
Předmět:	Condensed Matter::Materials Science Crystallography Materials science Condensed matter physics Magnetic shape-memory alloy Martensite Lattice (order) Neutron diffraction General Physics and Astronomy Atmospheric temperature range Critical value Boundary motion Magnetic field
Zdroj:	Journal de Physique IV (Proceedings). 112:963-967
ISSN:	1155-4339
DOI:	10.1051/jp4:20031041
Popis:	Structure in two Ni 2 MnGa alloys, that exhibit large magnetic field induced strain in martensite phase, was studied with neutron diffraction in temperature range 4K-354K. It is found that lattice parameters in martensite notably change with temperature. The magnetic field induced strain value decreases/rises with the rise/decrease of temperature according to the change of (1-c/a) in martensite phase. The critical value of the magnetic field for activation of the twin's boundary motion decreases with increasing temperature.
Databáze:	OpenAIRE
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