Effect of rare earth Dy addition on microstructure and martensitic transformation of polycrystalline Ni50Mn29Ga21-xDyx ferromagnetic shape memory alloys

被引：22

作者：

Gao, L. ^{[1
]}

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

Cai, W. ^{[1
]}

Zhao, L. C. ^{[1
]}

机构：

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

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 438卷 / SPEC. ISS.期

基金：

中国国家自然科学基金;

关键词：

Ni-Mn-Ga alloy; ferromagnetic shape memory alloys; martensitic transformation; rare earth;

D O I：

10.1016/j.msea.2006.02.190

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The effects of rare earth Dy addition on microstructure and martensitic transformation of polycrystalline Ni50Mn29Ga21-xDyx (numbers indicate at.%) shape memory alloys were investigated by means of scanning electron microscopy, energy dispersive X-ray spectroscopy, differential scanning calorimetry and X-ray diffraction. The results show that the microstructure of Ni-Mn-Ga-Dy alloys consists of the matrix and Dy-rich phase. Small amounts of the Dy-rich phase with 0.1 at.% Dy disperse homogeneously in the matrix. With the increase of the Dy content, the Dy-rich phase becomes larger and trends to distribute along the grain boundaries. The one-step martensitic transformation is observed in Ni50Mn29Ga21-xDyx alloys. With increasing Dy content, the martensitic transformation temperatures of Ni50Mn29Ga21-xDyx alloys increase remarkably, whereas the martensite structure of the Dy-containing alloys appears to be unchanged exhibiting seven-layered martensite structures at room temperature. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：1077 / 1080

页数：4

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