Phase transformations in rapidly quenched Ni-Mn-Ga alloys

被引：90
|
作者：
Chernenko, VA
Cesari, E
Pons, J
Seguí, C
机构：
[1] Natl Acad Sci Ukraine, Inst Magnetism, UA-252680 Kiev, Ukraine
[2] Univ Illes Balears, Dept Fis, E-07071 Palma de Mallorca, Spain
来源：
JOURNAL OF MATERIALS RESEARCH | 2000年 / 15卷 / 07期
关键词：
D O I：
10.1557/JMR.2000.0215
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Structural and ferromagnetic transitions in shape memory Ni-Mn-Ga alloys and their martensitic structure and microstructure were found to be strongly influenced by rapid quenching from the liquid state and by subsequent aging. Detailed calorimetric and magnetic measurements, dynamic mechanical analysis, and transmission electron microscopy observations were performed to characterize the transformation behavior of thin ribbons compared to the bulk materials. The rapid quenching caused the decrease of the ferromagnetic, martensitic, and premartensitic transformation temperatures, as well as of the saturation magnetization, while the subsequent annealing brought about an increase of the depressed values. This influence was attributed to quenched-in short-range chemical disorder within sublattices, the ordering being improved by a vacancy migration mechanism upon subsequent annealing.
引用
收藏
页码：1496 / 1504
页数：9
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