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Stress and temperature dependence of the structure of the martensite and X-phase in Ni$$_{2}$$MnGa

Fukuda, Takashi*; Terai, Tomoyuki*; Kushida, Hiroaki*; Kakeshita, Tomoyuki*; Osakabe, Toyotaka  ; Kakurai, Kazuhisa

The stress and temperature dependence of the structure of the X-phase in Ni$$_{2}$$MnGa has been investigated by neutron diffraction measurements under compressive stress to clarify the structural relationship among the P-, I-, M- and X-phases. The structure of the X-phase in Ni$$_{2}$$MnGa depends strongly on stress and temperature compared to the M- or I-phase. In association with the X $$rightarrow$$ M transformation, both the position and intensity of the satellite reflection changes drastically, regardless of stress and temperature, while with X $$rightarrow$$ P transformation, the intensity of the satellite reflection fades gradually. For the I $$rightarrow$$ X transformation, the position and intensity of the satellite changes drastically when transformation occur under compressive stress, while the changes are continuous under zero stress. These results strongly suggest the existence of a multicritical point in Ni$$_{2}$$MnGa.

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Category:Materials Science, Multidisciplinary

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