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Investigation of the enthalpy/entropy variation and structure of Ni–Mn–Sn (Co, In) melt-spun alloys

The effect of In and Co additions on the structure and thermal properties of melt-spun process Ni–Mn–Sn alloys has experimentally investigated at a solidification rate of ~48 m s−1. The present study reports on the analysis of the microstructure, martensitic transformation of Ni50Mn42.5Sn7.5, Ni50Mn37.5Sn7.5Co5 and Ni50Mn37Sn6.5In6.5. Heusler alloys produced by melt spinning. The crystal structures of the fabricated alloys were determined by means of X-ray diffraction. While the as-spun alloy Ni50Mn42.5Sn7.5 displayed a single-phase (14M monoclinic martensite) structure at room temperature, the as-spun Ni50Mn37.5Sn7.5Co5 displayed a main martensitic phase of a four-layered orthorhombic (4O) structure and the as-spun Ni50Mn37Sn6.5In6.5 displayed a single-phase cubic Heusler L21. The characteristic transformation temperatures and the thermodynamic parameters of the samples were determined by differential scanning calorimetry measurements. This study investigated the effect of the substitution of Co by Mn in Ni50Mn42.5−xSn7.5Cox. The martensitic transformation temperatures, enthalpy and entropy changes were found to increase progressively with doping Co content and the effect of the substitution of In by Mn. The martensitic transformation temperatures, enthalpy and entropy changes were found to decrease progressively with doping In

This study was supported by financial funds from the MAT2013-47231-C2-2-P project

© Journal of Thermal Analysis and Calorimetry, 2016, vol. 126, núm. 3, p. 1463-1468

Springer Verlag

Author: Bachaga, Tarek
Rekik, Hanen
Krifa, M.
Suñol Martínez, Joan Josep
Khitouni, Mohamed
Date: 2016 December
Abstract: The effect of In and Co additions on the structure and thermal properties of melt-spun process Ni–Mn–Sn alloys has experimentally investigated at a solidification rate of ~48 m s−1. The present study reports on the analysis of the microstructure, martensitic transformation of Ni50Mn42.5Sn7.5, Ni50Mn37.5Sn7.5Co5 and Ni50Mn37Sn6.5In6.5. Heusler alloys produced by melt spinning. The crystal structures of the fabricated alloys were determined by means of X-ray diffraction. While the as-spun alloy Ni50Mn42.5Sn7.5 displayed a single-phase (14M monoclinic martensite) structure at room temperature, the as-spun Ni50Mn37.5Sn7.5Co5 displayed a main martensitic phase of a four-layered orthorhombic (4O) structure and the as-spun Ni50Mn37Sn6.5In6.5 displayed a single-phase cubic Heusler L21. The characteristic transformation temperatures and the thermodynamic parameters of the samples were determined by differential scanning calorimetry measurements. This study investigated the effect of the substitution of Co by Mn in Ni50Mn42.5−xSn7.5Cox. The martensitic transformation temperatures, enthalpy and entropy changes were found to increase progressively with doping Co content and the effect of the substitution of In by Mn. The martensitic transformation temperatures, enthalpy and entropy changes were found to decrease progressively with doping In
This study was supported by financial funds from the MAT2013-47231-C2-2-P project
Format: application/pdf
ISSN: 1388-6150 (versió paper)
1588-2926 (versió electrònica)
Document access: http://hdl.handle.net/10256/13734
Language: eng
Publisher: Springer Verlag
Collection: MINECO/PE 2014-2016/MAT2013-47231-C2-2-P
Reproducció digital del document publicat a: http://dx.doi.org/10.1007/s10973-016-5716-z
Articles publicats (D-F)
Is part of: © Journal of Thermal Analysis and Calorimetry, 2016, vol. 126, núm. 3, p. 1463-1468
Rights: Tots els drets reservats
Subject: Aliatges amb memòria de forma
Shape memory alloys
Raigs X -- Difracció
X-rays -- Diffraction
Title: Investigation of the enthalpy/entropy variation and structure of Ni–Mn–Sn (Co, In) melt-spun alloys
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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