Study of the precipitate phases and martensitic transformation in quaternary Heusler alloys of NiMnGaDy

被引：25

作者：

Gao, L. ^{[1
]}

Sui, J. H. ^{[1
]}

Cai, W. ^{[1
]}

Gao, Z. Y. ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

来源：

SOLID STATE COMMUNICATIONS | 2009年 / 149卷 / 5-6期

基金：

中国国家自然科学基金;

关键词：

Magnetically ordered materials; Scanning and transmission electron microscopy; Phase transitions; FIELD-INDUCED STRAIN;

D O I：

10.1016/j.ssc.2008.10.030

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The precipitate pleases and martensitic transformation behavior of polycrystalline Ni50Mn29Ga21-xDyx (x = 0-5) ferromagnetic shape memory alloys are investigated. The results show that some Dy-rich precipitates are observed in higher Dy-addition alloys. The precipitates can be indexed to Dy(Ni. Mn)(4)Ga phase with a hexagonal CaCu5 type structure. When the content of Dy increases from 0.5 at.% to 2 at.%, Dy(Ni. Mn)(4)Ga phase distributes mainly along the grain boundaries, while a eutectic structure composed of the matrix and Dy(Ni. Mn)4Ga phase is observed with the further increase of Dy content. In addition, structural transition from 5M to 7M, and then to non-modulated T martensite appears with the increase of Dy content. It is found that substitution of Dy for Ga up to 5 at.%, one-step thermoelastic martensitic transformation can still be observed in this quaternary alloy. The Dy doping markedly increases the martensitic transformation temperature from 326 K to 512 K. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：257 / 260

页数：4

共 11 条

[1] THE DEVELOPMENT OF NEW FERROMAGNETIC SHAPE-MEMORY ALLOYS IN NI-MN-GA SYSTEM [J].

CHERNENKO, VA ;

CESARI, E ;

KOKORIN, VV ;

VITENKO, IN .

SCRIPTA METALLURGICA ET MATERIALIA, 1995, 33 (08) :1239-1244

[2] Effect of rare earth Dy addition on microstructure and martensitic transformation of polycrystalline Ni50Mn29Ga21-xDyx ferromagnetic shape memory alloys [J].

Gao, L. ;

Gao, Z. Y. ;

Cai, W. ;

Zhao, L. C. .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 438 (SPEC. ISS.) :1077-1080

[3]

Guo SH, 2004, J RARE EARTH, V22, P632

[4] Composition dependence on the martensitic structures of the Mn-rich NiMnGa alloys [J].

Jiang, CB ;

Muhammad, Y ;

Deng, LF ;

Wu, W ;

Xu, HB .

ACTA MATERIALIA, 2004, 52 (09) :2779-2785

[5] Magnetic properties of ternary gallides of type RNi4Ga (R=rare earths) [J].

Joshi, DA ;

Tomy, CV ;

Rana, DS ;

Nagarajan, R ;

Malik, SK .

SOLID STATE COMMUNICATIONS, 2006, 137 (04) :225-229

[6] 6% magnetic-field-induced strain by twin-boundary motion in ferromagnetic Ni-Mn-Ga [J].

Murray, SJ ;

Marioni, M ;

Allen, SM ;

O'Handley, RC ;

Lograsso, TA .

APPLIED PHYSICS LETTERS, 2000, 77 (06) :886-888

[7] Crystal structure of martensitic phases in Ni-Mn-Ga shape memory alloys [J].

Pons, J ;

Chernenko, VA ;

Santamarta, R ;

Cesari, E .

ACTA MATERIALIA, 2000, 48 (12) :3027-3038

[8] Modification of Ni-Mn-Ga ferromagnetic shape memory alloy by addition of rare earth elements [J].

Tsuchiya, K ;

Tsutsumi, A ;

Ohtsuka, H ;

Umemoto, M .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 378 (1-2) :370-376

[9] Giant magnetic-field-induced strains in Heusler alloy NiMnGa with modified composition [J].

Wu, GH ;

Yu, CH ;

Meng, LQ ;

Chen, JL ;

Yang, FM ;

Qi, SR ;

Zhan, WS ;

Wang, Z ;

Zheng, YF ;

Zhao, LC .

APPLIED PHYSICS LETTERS, 1999, 75 (19) :2990-2992

[10]

Zhao ZQ, 2004, J IRON STEEL RES INT, V11, P55

← 1 2 →