Thermal and structural study of Ni–Fe–Ga ferromagnetic shape memory alloys

First-principles computation of structural, elastic and magnetic properties of Ni2FeGa across the martensitic transformation

“…Both stoichiometric and off-stoichiometric compounds with compositions close to Ni 2 FeGa undergo a first-order structural transition from the cubic austenite to the tetragonal martensite on cooling [19,20], just like the prototype Ni 2 MnGa. The experimentally observed nonmodulated structure is tetragonal with c/a > 1.…”

Cooperative effect of monoclinic distortion and sinusoidal modulation in the martensitic structure of Ni2FeGa

“…However, the high brittleness of these alloys restricts the applications for the development of technologic devices. The Ni-Fe-Ga system as a new type of ferromagnetic shape memory alloys has been developed in order to improve toughness, it shows a notably better ductility than the Ni-Mn-Ga materials [7][8][9]. The stoichiometric Ni 2 FeGa is a Heusler alloy with the well-defined L2 1 atomic order, which has a relatively high Curie temperature of about T c =430 K, a martensitic transformation temperature of M s = 142 K, a saturated magnetization of 73 Am 2 /kg and a low saturated field of 0.6 T. Moreover, this alloy exhibits a completely recoverable two-way shape memory effect with a strain of 0.3% upon the thermoelastic martensitic transformation [5].…”

Phase transformations and magnetocaloric effect in NiFeGa ferromagnetic shape memory alloy

“…Ferromagnetic shape memory alloys (FSMAs) are becoming an important part of sensor and actuator materials due to their large magnetic-field-induced strain (MFIS) and shape memory effect (SME) in recent years [1,2]. The martensitic transformation (MT) temperature of the Heusler alloy system has been intensively studied [3][4][5].…”