Martensitic transformation in Ni-Mn-Ga alloys |
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| Authors: | G Fritsch V V Kokorin V A Chernenko A Kempf I K Zasimchuk |
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| Institution: | 1. Universit?t der Bundeswehr München BauV/Inst. , 1/Physik 85577, Neubiberg, Germany;2. Institute of Metal Physics , Vernadsky str. 36, Kiev, 252680, Ukraine |
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| Abstract: | Single crystals of different compositions in shape memory alloys Ni-Mn-Ga have been studied by electron and low temperature X-ray diffraction as well as by differential scanning calorimetry. It is shown that the cooling-induced martensitic phases are long-periodic ones modulated along the (110) directions by a transverse wave of atomic shifts with 5 and 7 atomic layers periodicity for the alloys studied exhibiting a martensitic transformation at 180 K and 446 K, respectively. The transformation heats appeared to be about 10 times different for both alloys. |
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| Keywords: | Martensitic transformation lattice modulation X-ray diffraction electron microscopy Ni-Mn-Ga alloys |
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