Correlation between particle size and magnetic properties in soft-milled Ni45Co5Mn34In16 powders
Fecha
2021Autor
Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión aceptada / Onetsi den bertsioa
Identificador del proyecto
Impacto
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10.1016/j.intermet.2020.107076
Resumen
The effect of microstructural defects induced by mechanical milling has been studied in a Ni–Mn–In–Co metamagnetic shape memory alloy. The martensitic transformation and Curie temperatures do not change with grinding, thus pointing out to a null variation of long range atomic order as a consequence of the deformation. Nevertheless, the enthalpy change of the martensitic transformation highly decr ...
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The effect of microstructural defects induced by mechanical milling has been studied in a Ni–Mn–In–Co metamagnetic shape memory alloy. The martensitic transformation and Curie temperatures do not change with grinding, thus pointing out to a null variation of long range atomic order as a consequence of the deformation. Nevertheless, the enthalpy change of the martensitic transformation highly decreases. This, and the large thermal stabilization of the martensite (with shifts on the temperature of the first reverse martensitic transformation up to 60 K), indicate the presence of a huge amount of internal stresses and microstructural defects in the obtained micro-particles. The presence of such defects considerably affects the saturation magnetization in austenite whereas almost no effect is observed in martensite. The magnetocaloric effect has been evaluated in samples with three different particle sizes. In spite of the MCE value is lower than in the bulk, the broader temperature range for the martensitic transformation in the powders makes the relative cooling power be comparable to that in the bulk. The as-milled micro-particles can be then considered as good preliminary candidates for magnetic refrigeration applications at the microscale. [--]
Materias
Internal strains,
Magnetocaloric effect,
Martensite stabilization,
Metamagnetic shape memory alloys,
Microstructural defects,
Milling
Editor
Elsevier
Publicado en
Intermetallics, 130 (2021) 107076
Departamento
Universidad Pública de Navarra. Departamento de Ciencias /
Nafarroako Unibertsitate Publikoa. Zientziak Saila /
Universidad Pública de Navarra/Nafarroako Unibertsitate Publikoa. Institute for Advanced Materials and Mathematics - INAMAT2
Versión del editor
Entidades Financiadoras
D. L. R. Khanna wants to acknowledge UPNA and InaMat for the Ph.D. Grant (Ayudas para contratos pre-doctorales adscritas a grupos e institutos de investigación UPNA). This work has been carried out with the financial support of the Spanish Ministerio de Ciencia, Innovación y Universidades (Project number RTI2018-094683-B-C 54,MCIU/AEI/FEDER, UE), Spain and the Navarra Government (project number PC017-018 AMELEC).