Structure and functional properties of microcrystalline NiTi alloy after severe deformation and subsequent annealing

被引：2
|
作者：
Stróz D. [1 ]
Dercz G. [1 ]
Lekston Z. [1 ]
Rak J. [1 ]
Palka J. [1 ]
Pawlicki J. [2 ]
机构：
[1] Institute of Materials Science, University of Silesia, 40-007 Katowice
[2] Faculty of Materials Science and Metallurgy, Silesian University of Technology, Gliwice
来源：
Materials Science Forum | 2011年 / 674卷
关键词：
Nanocrystallization; NiTi shape memory alloys; Severe deformation;
D O I：
10.4028/www.scientific.net/MSF.674.53
中图分类号：
学科分类号：
摘要：
Thermomechanical treatment was applied to a binary NiTi alloy in order to improve its functional properties by forming nanocrystalline structure of the alloy. The alloy deformation was obtained by cold rolling combined with transverse movement of the rolls. This technique allowed us to obtain high strain (εc ≈ 6) for the relatively large specimens. Subsequently, the samples were annealed in the temperature range 300-500°C in order to form a nano-, submicro-and/or microcrystalline structure. The evolution of the structure and associated changes of the transformation sequences and functional properties were studied with the use of TEM, X-ray phase analysis, DSC and bend and free recovery ASTM tests. A mixed amorphous/crystalline structure was obtained after severe deformation, the martensitic transformation was completely suppressed in the sample. Annealing at lower temperatures caused formation of nanocrystalline structure that grew to the microcrystalline and finally well-defined polygonized structure in annealed at 500°C specimens. © (2011) Trans Tech Publications, Switzerland.
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页码：53 / 60
页数：7
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