Effect of Ni substitution for Ga on the polycrystalline Ni-Mn-Ga-Gd high-temperature shape memory alloys

被引：22
作者：
Zhang, Xin [1 ]
Sui, Jiehe [1 ]
Zheng, Xiaohang [1 ]
Yang, Zheyi [1 ]
Tian, Xiaohua [1 ]
Cai, Wei [1 ]
机构：
[1] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2013年 / 557卷
关键词：
Ni-Mn-Ga-Gd alloys; Martensitic transformation; High-temperature shape memory effect; HIGH TRANSFORMATION TEMPERATURE; MARTENSITIC-TRANSFORMATION; MICROSTRUCTURE; NI54MN25GA21; X=0;
D O I：
10.1016/j.jallcom.2012.12.157
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：
Ni53+xMn25Ga21.9 Gd-x(0.1) (at.%) (x = 0-5) alloys had been obtained by substituting Ga for Ni to increase transformation temperature. The microstructure and phase transformation of polycrystalline Ni53+x-Mn25Ga21.9 Gd-x(0.1) alloys had been investigated by XRD, SEM, TEM and DSC. The results showed that the matrix of Ni53+xMn25Ga21.9 Gd-x(0.1) alloys were tetragonal martensite phase, and the face-centered cubic gamma phase was formed in Ni58Mn25Ga16.9Gd0.1 alloy. The transformation temperatures rose gradually with the increase of Ni content. The compressive fracture strength and strain firstly increased then decreased with the increase of Gd content when Ni content was less than 57 at.%. The generation of ductile gamma phase improved the compressive fracture strength and strain of Ni58Mn25Ga16.9Gd0.1 alloy up to 2327 MPa and 51.7%, respectively. The complete recovery was obtained in Ni53+xMn25Ga21.9 Gd-x-(0.1) (x = 0-3) alloys when the pre-strain was 10%. (c) 2013 Elsevier B.V. All rights reserved.
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页码：60 / 66
页数：7
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