Stress-induced and thermoelastic properties of Ni Fe Al melt-spun ribbon

Lattice parameters, elastic modulus, internal friction, superelasticity, and shape memory effect are studied in the vicinity of martensitic transformation MT exhibited by the Ni55Fe20Al25 melt-spun ribbon. In comparison to the melt-spun ribbons of other ferromagnetic shape memory alloys, Ni-Fe-Al ribbon has abnormally low elastic modulus, a record-breaking strength 350 MPa, and large recoverable strain up to 5% due to both the superelastic and ordinary shape memory effects. The critical stress versus temperature phase diagram consists of two straight lines, indicating the formation of different stress-induced martensitic phases. The structural and thermodynamic results proved to be self-consistent