Study of Co-Ni-Al Alloys with Magnetically Controlled Shape Memory Effect

被引：6
|
作者：
Kositsyna, I. I. [1 ]
Zavalishin, V. A. [1 ]
机构：
[1] RAS, Ural Branch, Inst Met Phys, Ekaterinburg 620041, Russia
来源：
FERROMAGNETIC SHAPE MEMORY ALLOYS II | 2010年 / 635卷
关键词：
ferromagnetic Co-Ni-Al alloys; phase composition; shape memory effect; melt spinning; microcrystalline structure; PHASE-TRANSFORMATIONS; GA;
D O I：
10.4028/www.scientific.net/MSF.635.75
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The methods of electron microscopy, resistometry and magnetometry are used to study ten (36-38)Co - (32-36)Ni - (27-30)Al (at. %) alloys. Cast coarse-crystalline and microcrystalline alloys made by melt spinning in a helium atmosphere are considered. It is shown that the martensite start temperature M-s becomes 30-50 degrees C lower as grains are refined to 1 mu m. Replacement of 1 at. % cobalt by nickel and 1 at. % aluminum by nickel makes the temperature interval of the B2 <-> L1(0) martensite transformation (30-60)degrees C and (100-110)degrees C higher respectively. The martensite transformation hysteresis is about 100 degrees. The melt-spun Co38Ni34Al28 alloy with the transformation temperatures M-s = 31 degrees C, M-f = -34 degrees C, A(s) = -6 degrees C, A(f) = 70 degrees C and T-c = 98 degrees C is a material possessing the magnetically controlled shape memory effect.
引用
收藏
页码：75 / 80
页数：6
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