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Martensitic transformation in melt-spun Heusler Ni–Mn–Sn–Co ribbons

Published online by Cambridge University Press:  27 March 2014

Hongxing Zheng*
Affiliation:
Laboratory for Microstructures, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
Wu Wang
Affiliation:
Laboratory for Microstructures, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
Jinke Yu
Affiliation:
Laboratory for Microstructures, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
Qijie Zhai
Affiliation:
Shanghai Key Laboratory of Modern Metallurgy & Materials Processing, Shanghai University, Shanghai 200072, China
Zhiping Luo
Affiliation:
Department of Chemistry and Physics and Southeastern North Carolina Regional Microanalytical and Imaging Consortium, Fayetteville State University, Fayetteville, North Carolina 28301
*
a)Address all correspondence to this author. e-mail: hxzheng@shu.edu.cn
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Abstract

Heusler Ni–Mn–(Ga, In, Sn, Sb) materials can provide large magnetic-field-induced strain, giant magnetocaloric and magnetoresistance effects based on their first-order solid-state martensitic transformation. In the present work, effects of Co doping on martensitic transformation behavior in melt-spun Ni–Mn–Sn ribbons were studied by x-ray diffraction, scanning/transmission electron microscopy, and thermal analysis. Experimental results showed that both martensitic transition and austenite Curie temperatures increased linearly with Co addition to Ni49Mn39Sn12; and meanwhile, crystal structures of the martensite evolved from four-layered orthorhombic (4O) to five-layered orthorhombic (10M), and then seven-layered monoclinic (14M). The compositional dependence of the martensitic transition temperatures was well correlated with changes of valence electron concentration (e/a) and unit-cell volume of high-temperature austenite. It was proposed that both increase of valence electron concentration and shrinkage of austenite unit-cell volume with Co addition are favorable to the occurrence of martensitic transformation. In addition, the Curie temperature of austenite increases with Co addition, which was ascribed to the enhancement of ferromagnetic exchange interaction.

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Copyright © Materials Research Society 2014 

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