Progress of Cryogenics and Isotopes Separation

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The National Conference with international participation on New Cryogenic and Isotope Technologies for Energy and Environment - EnergEn 2018 is organized by the National Research-Development Institute for Cryogenic and Isotopic Technologies - ICSI Rm. Valcea with the scientific participation of the University of Pitesti and the University of Craiova and will be held at Baile Govora, in 2018.
SHAPE MEMORY BEHAVIOR AND ONE-WAY SHAPE MEMORY EFFECT OF A NiTi SHAPE MEMORY BANDS Print

SHAPE MEMORY BEHAVIOR AND ONE-WAY SHAPE MEMORY EFFECT OF A NiTi SHAPE MEMORY BANDS

 

 

Alina Niculescu*, Ioan Ştefănescu, Amalia Soare, Mihai Vijulie, Sebastian Brad

 

National Research and Development Institute for Cryogenics and Isotopic Technologies - ICIT Rm. Valcea, code 240050 - Rm. Valcea, 4 Uzinei Street, PO Box 7 Raureni, Valcea, Romania

 

 

ABSTRACT

 

To define the alloy’s shape, this is constrained under deformation and then heat treated. The one-way shape memory effect in a NiTi high temperature shape memory alloy  has been systematically studied by bending tests. In the NiTi alloy, the martensite deformation is an effective method to get two-way shape memory effect even with a small deformation strain. Internal structure and shape memory behavior of NiTi bands heat-treated at 100 K, 200 K, and 300 K were investigated by Scanning Electron Microscopy (SEM) and X-ray fluorescence at room temperature. The NiTi shape memory bands were supplied by Memry Company, with following thickness: 0.05mm, 0.5mm, 1.25mm, 0.203mm.  The results showed that the NiTi bands possess super-elastic properties, and the transformation temperature is 113°C; also, it has been noticed that the alloy has a higher content of titanium and exhibit shape memory effect.

 

KEYWORDS: Ni-Ti shape memory alloys, one-way shape memory effect, shape memory effect, martensite

*Corresponding authors: Alina Niculescu, e-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , phone:0040 250 736979, fax:0040 250 732746