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

L. Gao; J. H. Sui; W. Cai; Z. Y. Gao

doi:10.1016/j.ssc.2008.10.030

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

L. Gao
, J. H. Sui
, W. Cai^*
, Z. Y. Gao

^*Corresponding author for this work

Harbin Institute of Technology

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

The precipitate phases and martensitic transformation behavior of polycrystalline Ni₅₀Mn₂₉Ga_21-xDy_x (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)₄Ga phase with a hexagonal CaCu₅ type structure. When the content of Dy increases from 0.5 at.% to 2 at.%, Dy(Ni,Mn)₄Ga 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.

Original language	English
Pages (from-to)	257-260
Number of pages	4
Journal	Solid State Communications
Volume	149
Issue number	5-6
DOIs	https://doi.org/10.1016/j.ssc.2008.10.030
State	Published - Feb 2009
Externally published	Yes

Keywords

A. Magnetically ordered materials
C. Scanning and transmission electron microscopy
D. Phase transitions

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10.1016/j.ssc.2008.10.030

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@article{f3ba863994bc49c7a5526f6cb3e4cf4a,

title = "Study of the precipitate phases and martensitic transformation in quaternary Heusler alloys of NiMnGaDy",

abstract = "The precipitate phases 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)4Ga phase with a hexagonal CaCu5 type structure. When the content of Dy increases from 0.5 at.\% to 2 at.\%, Dy(Ni,Mn)4Ga 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.",

keywords = "A. Magnetically ordered materials, C. Scanning and transmission electron microscopy, D. Phase transitions",

author = "L. Gao and Sui, \{J. H.\} and W. Cai and Gao, \{Z. Y.\}",

year = "2009",

month = feb,

doi = "10.1016/j.ssc.2008.10.030",

language = "英语",

volume = "149",

pages = "257--260",

journal = "Solid State Communications",

issn = "0038-1098",

publisher = "Elsevier Ltd",

number = "5-6",

}

TY - JOUR

T1 - Study of the precipitate phases and martensitic transformation in quaternary Heusler alloys of NiMnGaDy

AU - Gao, L.

AU - Sui, J. H.

AU - Cai, W.

AU - Gao, Z. Y.

PY - 2009/2

Y1 - 2009/2

N2 - The precipitate phases 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)4Ga phase with a hexagonal CaCu5 type structure. When the content of Dy increases from 0.5 at.% to 2 at.%, Dy(Ni,Mn)4Ga 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.

AB - The precipitate phases 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)4Ga phase with a hexagonal CaCu5 type structure. When the content of Dy increases from 0.5 at.% to 2 at.%, Dy(Ni,Mn)4Ga 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.

KW - A. Magnetically ordered materials

KW - C. Scanning and transmission electron microscopy

KW - D. Phase transitions

UR - https://www.scopus.com/pages/publications/58049127742

U2 - 10.1016/j.ssc.2008.10.030

DO - 10.1016/j.ssc.2008.10.030

M3 - 文章

AN - SCOPUS:58049127742

SN - 0038-1098

VL - 149

SP - 257

EP - 260

JO - Solid State Communications

JF - Solid State Communications

IS - 5-6

ER -

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

Abstract

Keywords

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