Effect of Dy addition on mechanical and magnetic properties of Mn-rich Ni-Mn-Ga ferromagnetic shape memory alloys

被引：15
作者：
Gao, L. [1 ]
Dong, G. F. [2 ]
Gao, Z. Y. [3 ]
Cai, W. [3 ]
机构：
[1] Shanghai Ocean Univ, Coll Engn Sci & Technol, Shanghai 201306, Peoples R China
[2] Dalian Univ, Dept Phys, Dalian 116622, Peoples R China
[3] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 520卷
关键词：
Ferromagnetic shape memory alloy; Rare earth element; Mechanical properties; Curie temperature; FIELD-INDUCED STRAINS; MARTENSITIC-TRANSFORMATION; PHASE-TRANSFORMATION; HEUSLER ALLOYS; MICROSTRUCTURE; CRYSTALS; NIMNGA;
D O I：
10.1016/j.jallcom.2012.01.048
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：
The effects of partial substitution of rare earth Dy for Ga on the mechanical and magnetic properties of Mn-rich Ni50Mn29Ga21-xDyx (0 <= x <= 5) ferromagnetic shape memory alloys were investigated in detail. The results show that an appropriate amount of Dy addition significantly improves the mechanical properties of Ni-Mn-Ga alloy. With an increase in Dy content, the compressive strength enhances rapidly at first and then becomes stable when the Dy content is more than 1 at.%. However, the compressive strain increases dramatically and reaches a maximum value with 1 at.% Dy addition. Further increase in Dy content makes the compressive strain of the alloys decrease gradually. The mechanism of the improved mechanical properties is also discussed. Moreover, Dy doping changes the fracture type from intergranular fracture of Ni-Mn-Ga alloy to transgranular cleavage fracture of Ni-Mn-Ga-Dy alloys. The Curie temperature remains almost unchanged at low Dy content and subsequently decreases. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：281 / 286
页数：6
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