Comparative study of structural and magnetic properties of ribbon and bulk Ni55Fe19Ga26 Heusler alloy

JOURNAL OF ALLOYS AND COMPOUNDS

卷:889

Article

Manchon-Gordon, A. F.¹  Ipus, J. J.¹  Kowalczyk, M.²  Blazquez, J. S.¹  Conde, C. F.¹  Svec, P.³  Kulik, T.²  Conde, A.¹ 

[1] Univ Seville, Dept Fis Mat Condensada, ICMSE CSIC, POB 1065, Seville 41080, Spain

[2] Warsaw Univ Technol, Fac Mat Sci & Engn, 141 Woloska St, PL-02507 Warsaw, Poland

[3] Slovak Acad Sci, Inst Phys, Dubravska Cesta 9, Bratislava 84511 45, Slovakia

关键词: Magnetic shape memory alloys;    Martensite structure;    Magnetostructural transition;    Heusler alloy;    Melt-spinning;   

DOI  :  10.1016/j.jallcom.2021.161819

来源: Elsevier

【 摘 要 】

The influence of the fabrication method on the magnetostructural properties of a Ni55Fe19Ga26 Heusler alloy, obtained both as a ribbon, by melt-spinning, and as a pellet, by arc-melting, has been analyzed. It has been found that, while the arc-melting technique leads to the precipitation of the gamma phase and to a non-modulated martensite structure, the alloy prepared by melt-spinning presents a fully 14M modulated martensitic structure at room temperature. The tetragonal non-modulated martensite in the arc-melted bulk sample transforms into the 14M structure after a long thermal treatment (at 1073 K for 24 h) and subsequent quenching. Characteristic temperatures of the martensitic transformation are higher for melt-spun ribbons than for bulk sample, due to the precipitation of the gamma phase and consequent different martensite composition. However, while the martensitic transformation temperature is practically constant in the case of the bulk sample, it changes by similar to 150 K in the case of the ribbon sample submitted to the same thermal treatment applied to bulk samples. Finally, it was found that the martensitic transformation occurs in the paramagnetic regime of both types of samples. (C) 2021 The Author(s). Published by Elsevier B.V.

【 授权许可】

Free