Thermal and magnetic field-induced martensite-austenite transition in Ni50.3 Mn35.3 Sn14.4 ribbons

Abstract

Thermal and field-induced martensite-austenite transition was studied in melt spun Ni50.3 Mn35.3 Sn14.4 ribbons. Its distinct highly ordered columnarlike microstructure normal to ribbon plane allows the direct observation of critical fields at which field-induced and highly hysteretic reverse transformation starts (H=17 kOe at 240 K), and easy magnetization direction for austenite and martensite phases with respect to the rolling direction. Single phase L 21 bcc austenite with TC of 313 K transforms into a 7M orthorhombic martensite with thermal hysteresis of 21 K and transformation temperatures of MS =226 K, Mf =218 K, AS =237 K, and Af =244 K. © 2008 American Institute of Physics.