Martensitic and magnetic transformations of Ni[sub 2] MnGa-based shape-memory alloys

Inoue, K.; Yamaguchi, Y.; Ohoyama, K.; Note, R.; Enami, K.
June 2002
Applied Physics A: Materials Science & Processing;Dec2002 Supplement, Vol. 74 Issue 6, ps1061
Academic Journal
After the observation of a shape-memory phenomenon of a Heusler-type single crystal, Ni[sub 2.18]Mn[sub 0.82]Ga alloy, we carried out powder neutron diffraction of this alloy by changing the temperature. Rietveld analysis of the diffraction patterns revealed that the martensitic transformation reasonably well explains the shape-memory phenomenon. It was also found that two crystal structures coexist in the martensitic phase. One is an orthorhombic structure and the other is a monoclinic structure with a shuffling of a six-layer period of the (220) plane along the [110] direction of this orthorhombic structure. Comparing the present results with our previous results of the powder neutron diffraction of Ni[sub 2.19]Mn[sub 0.81]Ga alloy under a magnetic field, where the magnetic field caused the martensitic transformation from paramagnetic mother phase to ferromagnetic martensitic phase, we can discuss the possibility of controlling the shape-memory effect by an external magnetic field.


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