Effect of solidification rate on martensitic transformation behavior and adiabatic magnetocaloric effect of Ni50Mn35In15 ribbons

被引：21

作者：

Aguilar-Ortiz, C. O. ^{[1
,2
,3
]}

Camarillo-Garcia, J. P. ^{[1
]}

Vergara, J. ^{[1
]}

Alvarez-Alonso, P. ^{[4
]}

Salazar, D. ^{[2
,3
]}

Chernenko, V. A. ^{[2
,3
,5
]}

Flores-Zuniga, H. ^{[1
]}

机构：

[1] Inst Potosino Invest Cient & Tecnol AC, Div Mat Avanzados, San Luis Potosi 78216, Mexico

[2] BCMaterials, Bilbao 48080, Spain

[3] Univ Basque Country UPV EHU, Bilbao 48080, Spain

[4] Univ Oviedo, Dept Fis, E-33007 Oviedo, Spain

[5] Ikerbasque, Basque Fdn Sci, Bilbao 48013, Spain

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 748卷

关键词：

Metamagnetic shape memory ribbons; Chemical order; Adiabatic magnetocaloric effect; Solidification rate; NI-MN-SN; SHAPE-MEMORY ALLOYS; MELT-SPUN RIBBONS; MAGNETIC-PROPERTIES; TEMPERATURE-CHANGE; HEUSLER ALLOY; EXCHANGE BIAS; TRANSITION; GA; GIANT;

D O I：

10.1016/j.jallcom.2018.03.074

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ni50Mn35In15 compound has become an archetype for investigating the functional properties of meta-magnetic shape memory alloys. We have fabricated Ni50Mn35In15 melt spun ribbons to study the crystal structure, microstructure, martensitic transformation, magnetic properties and magnetocaloric effect as a function of the ribbon solidification rate controlled by the wheel speed. We have found that an increase of the cooling rate refines the alloy grain size, which, in turn, influences the chemical order of austenite phase and functional properties: ribbons produced at low wheel speed (10, 20 and 30 m/s) present majorly L2(1) structure associated with higher magnetic entropy change, Delta S-M (up to 18.6 J/kgK for a magnetic field change of mu(0)Delta H = 5T) and Curie temperatures of austenite, T-C(A), and martensite, T-C(M) (T-C(A) = 309 K and T-C(M) = 199 K) compared with the B2-ordered single phase ribbons (Delta S-M = 11.3 J/kgK for mu(0)Delta H = 5 T; T-C(A) = 293 K; T-C(M) = 178 K) obtained at higher cooling rates (40 and 50 m/s). Besides, we have also observed a correlation between the grain size reduction and a shift of the martensitic transformation to lower temperatures. Direct measurements of the adiabatic temperature change have been performed during both the first-and second-order phase transitions. The results disclose the correlation between structural and magnetic properties of the ribbon and the wheel speed, which opens an innovative tool to adjust the transformation characteristics and magnetocaloric properties through the solidification rate control. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：464 / 472

页数：9

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