Study of 10M' Nanotwinned Phase in the Vicinity of Martensitic Transformation in Ni-Mn-Ga Magnetic Shape Memory Alloy
P. Veřtáta, b, L. Strakaa, c, J. Drahokoupila, O. Heczkoa, c
aInstitute of Physics of the Czech Academy of Sciences, Na Slovance 2, 182 21 Praha 8, Czech Republic
bCzech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Department of Solid State Engineering, Trojanova 13, 120 00 Prague, Czech Republic
cCharles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague, Czech Republic
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Ni50.0Mn28.5Ga21.5 single crystal exhibiting magnetic shape memory effect was analysed by X-ray diffraction, electric resistivity and differential scanning calorimetry. Based on the intensities of the measured diffraction peaks, we discuss the evolution of the structure and microstructure during heating and cooling. Electric resistivity and DSC curves detect anomalous behaviour prior the transformation from martensite to austenite. We ascribe these pre-transformation changes in measured curves to formation of the recently discovered nanotwinned form of 10M martensite.

DOI:10.12693/APhysPolA.134.859
PACS numbers: 61.05.cp, 61.50.-f, 75.50.Cc, 75.80.+q