Resumen de On the kinetic arrest of martensitic transformation in Ni-Mn-In melt-spun ribbons
F.M. Lino Zapata, David Ríos Jara, José Luis Sánchez Llamazares
Kinetic arrest (KA) of martensitic transformation (MT) has been observed in as-solidified Ni_(52.2)Mn_(34.3)In_(13.5) melt-spun ribbons; a characterization by dc magnetization measurements was carried out. These alloy ribbons transform martensitically from a single austenitic (AST) parent phase with B2-type crystal structure. For an applied magnetic field ^(µ0)H of 1 T and up to 9 T, a moderate but progressive KA of the MT is observed. The metastability of the non-equilibrium field-cooled glassy state was characterized by introducing thermal and magnetic field fluctuations. It was found that the total magnetization difference (∆σ) between the zero field-cooling (ZFC) and field-cooling (FC) pathways of the temperature dependence of magnetization ∆σ(T) shows irreversible and reversible components; the former decreases as the temperature decreases. After a short thermal annealing of 10 min at 1073 K AST shows a highly ordered L2_(1)-type crystal structure and the kinetic arrest of martensitic transformation is no longer observed suggesting a connection between the crystal structure order of austenite and the appearance of the kinetic arrest phenomenon.
