Phase transition and magnetocaloric effect of Ni50Mn29Ga21-xTbx (0 ≤ x ≤ 1) alloys

被引：15
作者：
Wu, Yuye [1 ]
Wang, Jingmin [1 ]
Hua, Hui [1 ]
Jiang, Chengbao [1 ]
Xu, Huibin [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Aerosp Mat & Performance, Beijing 100191, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2015年 / 632卷
基金：
北京市自然科学基金;
关键词：
Ni-Mn-Ga; Martensitic transformation; Magneto-structural transition; Magnetocaloric effect; MARTENSITIC-TRANSFORMATION; MAGNETIC-FIELD; MEMORY; MICROSTRUCTURE; TEMPERATURE;
D O I：
10.1016/j.jallcom.2015.01.279
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：
Ni50Mn29Ga21 Tb-x(x) (0 <= x <= 1) alloys were studied with the microstructure, phase transition, and magnetocaloric effect. Dual-phase microstructure containing the martensite matrix and Tb-rich precipitations were formed. The martensitic transformation was observed over the whole composition range, with the transformation temperature T-M significantly increased by the addition of terbium. The magnetic transition temperatures of the austenite and martensite, i.e. T-C(A) and T-C(M), were monitored for 0 <= x <= 0.16 and 0.27 <= x <= 1, respectively. Both T-C(A) and T-C(M) were slightly decreased by the addition of terbium. For 0.16 <= x <= 0.27 the martensitic transformation was coincided with the magnetic transition in case of T-M = T-C, giving rise to the coupled magneto-structural transition from ferromagnetic martensite to paramagnetic austenite. Sizable magnetic entropy change was induced by magnetic field in the vicinity of the coupled magneto-structural transition. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：681 / 685
页数：5
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