Quenching Effect on Twin Roller Melt Spun NdFeBNiC Alloys

J. M. LEVINGSTON; L. M. FABIETTI; S. E. URRETA

Buenos Aires

Workshop; X - Latin American Workshop on Magnetism, Magnetic Materials and their Applications; 2013

Ministerio de Ciencia, Tecnología e Innovación Productiva

The motivation of this work is to determine the structural and magnetic properties of a potential magnetic composite melt spun at different velocities in a twin roller device. The Nd2Fe14B + 20wt.%(Fe84,9Ni15C0,1) system was chosen with the idea of generating a composite between a hard magnetic phase (2-14-1) and a hardenable magnetic phase. FeNiC alloys have a martensitic transformation at a temperature which strongly depends on the composition. The alloy with the nominal composition used in this work has an Ms around 473 K. The alloy preparation method includes a step where all the elements are melted together, then, variations in the nominal composition of each phase are expected. In order of determining if a martensitic phase was achievable at room temperature; two cooling conditions were employed in the twin roller melting step. For each velocity, two different cooling sequence were imposed. In one case the ribbons were let cool in the air and in another they were water quenched immediately after they leave the wheels.