Elastic and superelastic properties of NiFeCoGa fibers grown by micro-pulling-down method

Abstract

Low-frequency elastic modulus, internal friction, tensile stress-strain loops, and thermally-induced strain recovery of single-crystal fibers obtained by pulling-down method from the melts of NiFeGaCo alloys were studied. A minimum of the elastic modulus and the maximum peak of the internal friction were obtained at the martensitic transition temperature. A large super-elastic strain of about 10% was obtained in the fiber of the Ni 49Fe 18Ga 27Co 6 alloy. Thermodynamic estimation by the Clausius-Clapeyron equation was consistent with the experimental results, © 2009 The Japan Institute of Metals.