Martensitic transformation and magnetic properties of Heusler alloy Ni–Fe–Ga ribbon

Microstructure and low-temperature phase transition in Ni2FeGa Heusler alloy

“…It is also noted that numerous types of superstructure modulations appear along with martensitic transition at low temperatures [18,19]. For Ni 2 FeGa, it is found that, with increasing Ni concentration in ribbons, the martensitic transformation temperature increases progressively, on the other hand, the Curie temperature decreases from 440 to 312 K [3]. In the present study, the structural properties of the Ni 2 FeGa Heusler phase have been investigated by means of TEM.…”

“…The Ni 2 MnGa Heusler-type alloys and several notable systems, such as Ni-Fe-Ga, Co-Ni-Ga, Ni-Mn-Fe-Ga, Co-Ni-Al, Ni 2 MnAl, Fe-Pd, etc., have been extensively studied in recent investigations [1][2][3][4][5][6][7][8][9][10]. It is generally accepted that Ni-Fe-Ga alloy has a chemically ordered L2 1 structure and exhibits a thermoelastic martensitic transformation from a cubic to an orthorhombic structure at 142 K [3]. Previously, numerous investigations focusing on martensitic transformation (MT), magnetization, and microstructure features have been performed on materials prepared under different conditions.…”

The Effects of Composition and Aging on the Martensite and Magnetic Transformations in Ni-Fe-Ga Ferromagnetic Shape Memory Alloys

“…The magnetocrystalline anisotropy constant of the austenite in Ni-Fe-Ga alloys increases with decreasing temperature, making saturation more difficult. [27] Thus, during cooling, the magnetization vectors rotate away from the applied magnetic field direction and toward the easy axes of randomly oriented grains in the austenite, and the overall magnetization decreases. Additionally, the presence of the incommensurate ordered v-phase in this alloy may result in additional sites for magnetic domain wall pinning, further enhancing the decrease in magnetization with decreasing temperature.…”

Recent progress in Heusler-type magnetic shape memory alloys

“…Since Ullakko et al [21] discovered large magnetic field-induced strains (MFISs) in Heusler alloy Ni 2 MnGa single crystal in 1996, many Heusler alloys have been investigated extensively such as NiMnZ (Z = In, Sn, Sb, Al) [22][23][24], NiCoMnZ (Z = In, Sn, Sb, Al, Ga) [6,25,26], Ni 2 FeZ [27][28][29][30][31], Mn 2 NiZ [32,33], Fe 2 MnZ [34,35], and Co 2 NiZ [36][37][38]. This kind of MFISs exhibit many merits, such as large strain, high work output, high response frequency, and tunable working temperature.…”