Results 141 to 150 of about 1,581 (182)

The intermediate phase of the shape-memory alloy NiTi

Journal of Physics F: Metal Physics, 1985
The structural properties of equiatomic NiTi have been investigated by single-crystal neutron elastic scattering. The premartensitic phase transition of NiTi is characterised by a second-order displacive transition which is driven by a condensation of the T2A(110) phonon mode at Tc=75 degrees C.
H Tietze, M Mullner, P Selgert, W Assmus
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Electrolytic processing of NiTi shape memory alloys

Materials Science and Engineering: A, 2004
Abstract The manufacturing of high-grade products made of nickel–titanium shape-memory alloys (NiTi-SMA) causes high demands on the surface finishing. The disadvantage of mechanical procedures is the emerging of deformation layers, whereas thermal treatment may lead to a modification of the function properties of the NiTi-SMA in the heat-affected ...
M. Pohl, C. Heßing, J. Frenzel
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Corrosion resistance tests on NiTi shape memory alloy

Biomaterials, 1996
The corrosion performances of NiTi shape memory alloys (SMA) in human body simulating fluids were evaluated in comparison with other implant materials. As for the passivity current in potentiostatic conditions, taken as an index of ion release, the values are about three times higher for NiTi than for Ti6Al4V and austenitic stainless steels.
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Fretting Wear of NiTi - Shape-Memory Alloy

2016
This study presents the results of tests of friction processes and fretting wear of NiTi shape-memory alloy, which is used in orthodontics and surgery. This research problem is significant because nickel ions released as a result of nitinol wear exhibit toxic action in the human body.
Marcin Klekotka, Jan Ryszard Dąbrowski
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Elastic fields in NiTi shape memory alloys

SPIE Proceedings, 2001
This paper includes the results of experimental investigation and calculations of changes in residual stresses in NiTi shape memory alloys. For this purpose, the test of thermal and mechanical loading on the samples of Ni 50 Ti 50 was performed. One-way and two-way shape memory effects were observed during loading and heating, i.e.
Teodor M. Breczko, Krzysztof Kus
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Machining of NiTi-shape memory alloys-A review

Machining Science and Technology, 2017
The emerging trends in the development of advanced smart materials with better unique properties under different environments for a particular application fascinate the researchers and industrialis...
C. Velmurugan, V. Senthilkumar, S. Dinesh, D. Arulkirubakaran   +3 more
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Functionally graded NiTi shape memory alloys

Ciência & Tecnologia dos Materiais, 2017
Abstract In this study, in order to obtain a functionally graded material, NiTi strips were annealed at 350 °C, 450 °C and 550 °C in a furnace using an assembly that allowed a temperature gradient along them, and their transformation temperatures were studied by Differential Scanning Calorimetry (DSC).
F.E. Ferreira, A.R. Alves, J.P. Oliveira, F.M. Braz Fernandes   +3 more
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Bioactive modification of NiTi shape memory alloy

SPIE Proceedings, 2007
NiTi wire was anodized in phosphoric acid, diluted hydrogen fluoride, and fluoric ions containing non-aqueous electrolytes. Surface morphologies and compositions of modified NiTi wires were characterized by using field-emission scanning electron microscopic (FESEM) equipped with an energy dispersive spectroscopy (EDS).
Chuanjun Huang, Yibing Xie, Limin Zhou, Haitao Huang, Jian Lu, Yihe Zhang   +5 more
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Turning and Drilling of NiTi Shape Memory Alloys

CIRP Annals, 2004
Abstract Shape memory alloys based on NiTi have a high potential for a large variety of applications. This functional material is very difficult to machine because of its high ductility, its different shape memory properties in dependence on temperature and the strong work hardening when this material is deformed.
K. Weinert, V. Petzoldt, D. Kötter
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Revkrsion stresses in NiTi shape memory alloys

Scripta Metallurgica, 1988
Description de la methode de mesure de la contrainte de reversion. Mise en evidence d'une valeur maximale de cette contrainte generee a une temperature donnee dans l'alliage Ni 59 Ti 51 . Cette valeur maximale est la contrainte de transformation martensitique reversible correspondant a une boucle pseudoelastique.
K. Madangopal, Ganesh R. Krishnan, S. Banerjee   +2 more
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