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

Chernenko, V. A.; Kanth, B. Rajini; Mukhopadhyay, P. K.; Kaul, S. N.; Villa, E.; Gambardella, A.; Besseghini, S.
October 2008
Applied Physics Letters;10/6/2008, Vol. 93 Issue 14, p141904
Academic Journal
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.


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