|Number of page(s)||4|
|Section||Principles, Simulations, Materials: Background|
|Published online||01 September 2009|
Structural behavior of Ni-Mn-(In, Sn) Heusler melt spun ribbonsJ.J. Suñol1, L. Escoda1, B. Hernando2, J.L. Sánchez Llamazares2 and V.M. Prida2
1 Universitat de Girona, Campus de Montilivi s/n, edifici PII, Lluís Santaló s/n. 17003 Girona, Spain
2 Departamento de Física, Facultad de Ciencias, Universidad de Oviedo, Calvo Sotelo s/n, 33007 Oviedo, Spain.
Published online: 1 September 2009
In present contribution we discuss the structural properties of the austenite and martensite phases that form in as-spun ribbons of some selected compositions of the ternary system Ni50Mn50-x(In,Sn)x, their characteristic crystallographic texture and the effect of vacuum annealing. X-Ray diffraction analysis showed that in all the cases austenite crystallized in an ordered cubic L21-type structure. For thermally annealed samples diffraction lines becomes narrower in comparison with those of as-quenched samples, cell parameters tend reduce and crystallographic texture is preserved and improved. Furthermore, the structure and the martensitic temperature transformation can significantly differ from that of bulk alloys. Thus, materials with different structure, magnetoelastic behavior and transformation temperatures can be produced by melt spinning controlling starting composition and quenching conditions. In textured ribbons, the columnar, almost 1-dimensional, shape of the grains makes structural changes more difficult than in bulk materials (3-dimensional shape), thus explaining the differences observed in their structure and temperature magnitudes involved.
© Owned by the authors, published by EDP Sciences 2009