Study of the transformation sequence on a high temperature martensitic transformation Ni-Mn-Ga-Co shape memory alloy
作者： V Recarte , J I Pérez-Landazábal , V Sánchez-Alarcos , J A Rodríguez-Velamazán
DOI: 10.1088/1742-6596/549/1/012017
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摘要: Ni-Mn-Ga alloys show the highest magnetic-field-induced strain among ferromagnetic shape memory alloys. A great effort is being done in this alloy system to increase application temperature range. In sense, addition of small amounts Cobalt NiMnGa has been proved MT temperatures through electron per atom relation (e/a). work, analysis crystal structure present phases and phase transformations performed on a Ni-Mn-Ga-Co by neutron diffraction measurements from 10 K 673 K. The study completed means calorimetric magnetic measurements. On cooling undergoes martensitic transformation face centered cubic nonmodulated tetragonal martensite. appearance intermartensite can be disregarded whole range below transformation. However, jump unit-cell volume martensite observed at 325 Since close Curie both, structural contributions are taken into account explain results.
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