Effect of Severe Torsion Deformation on Structure and Properties of Titanium-Nickel Shape Memory Alloy

被引：5
作者：
Komarov, Victor [1 ,2 ,3 ]
Karelin, Roman [1 ,2 ]
Cherkasov, Vladimir [1 ]
Yusupov, Vladimir [2 ]
Korpala, Grzegorz [3 ]
Kawalla, Rudolf [3 ]
Prahl, Ulrich [3 ]
Prokoshkin, Sergey [1 ]
机构：
[1] Natl Univ Sci & Technol MISIS, Moscow 119049, Russia
[2] RAS, Baikov Inst Met & Mat Sci, Moscow 119334, Russia
[3] TU Bergakad Freiberg, Inst Met Forming, D-09599 Freiberg, Germany
来源：
METALS | 2023年 / 13卷 / 06期
基金：
俄罗斯科学基金会;
关键词：
shape memory alloys; NiTi; titanium nickelide; severe plastic deformation; torsional deformation; nanostructured materials; STRAINING PROCESS; GRAIN-REFINEMENT; NI; MICROSTRUCTURE;
D O I：
10.3390/met13061099
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In the present work, the possibility of applying severe torsion deformation (STD) to a bulk near-equiatomic NiTi shape memory alloy in order to accumulate super-high strain and improve mechanical and functional properties was studied. STD was performed using the multidirectional test system "BaHR MDS-830" at a temperature of 500 & DEG;C (the upper border temperature for the development of dynamic polygonization) in 14 and 30 turns with accumulated true strain values of 4.3 and 9.1, respectively. Structural phase state and properties were studied using differential scanning calorimetry, X-ray diffractometry, transmission electron microscopy, hardness measurements, and thermomechanical bending tests. STD at 500 & DEG;C allowed for the accumulation of high strain without failure. As a result of STD in 30 turns, a submicrocrystalline structure with an average grain/subgrain size of about 500 nm was formed. This structure ensured the achievement of high maximum completely recoverable strain values of 6.1-6.8%. The results obtained show the prospects of applying severe torsion straining deformation to titanium nickelide in terms of forming an ultrafine-grained structure and high properties.
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页数：9
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