Structural Transitions in a Co2NiGa Ferromagnetic Shape Memory Alloy

被引:0
作者
Craciunescu, Corneliu M. [1 ]
Mahesh, Karimbi. K. [1 ]
Silva, Rui J. C. [1 ]
Braz Fernandes, Francisco M. [1 ]
机构
[1] UNL, CENIMAT I3N, FCT, P-2829516 Monte De Caparica, Portugal
来源
SOLID-SOLID PHASE TRANSFORMATIONS IN INORGANIC MATERIALS, PTS 1-2 | 2011年 / 172-174卷
关键词
ferromagnetic shape memory alloys; Co-Ni-Ga system; phase transformation X-ray diffraction; SEVERE PLASTIC-DEFORMATION; MARTENSITIC-TRANSFORMATION; MAGNETOSTRICTION; MICROSTRUCTURE; CONIGA; SYSTEM;
D O I
10.4028/www.scientific.net/SSP.172-174.202
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The development of ferromagnetic shape memory for practical applications needs to overpass brittleness issues, in addition to the control of the magnetoelastic domains. The Co-Ni-Ga system can provide adequate structural particularities to increase the ductility. This paper reports on structural observations of the martensitic transformation in a Co2NiGa alloy, in the as-cast and in plastically deformed state. Characterization has been performed before and after the heat treatment, using in-situ X-ray diffraction, optical and electron microscopy, as well as DSC measurements performed on heating and cooling of the samples. The observations show a beta + gamma two-phase structure that can be further influenced by quenching. The structural contribution on the deformation capacity of the alloys is analyzed, based on the changes in the pattern of transformation. Severe plastic deformation by cold rolling leads to the disappearance of the thermoelastic phase transformation.
引用
收藏
页码:202 / 207
页数:6
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