Superelastic Properties of NiTi for new generation cooling technologies


Özkan S., Demirtaş E., Durak Yüzüak G., Yüzüak E.

5th INTERNATIONAL ANATOLIAN ENERGY SYMPOSIUM, Trabzon, Turkey, 24 - 26 March 2021, pp.50

  • Publication Type: Conference Paper / Summary Text
  • City: Trabzon
  • Country: Turkey
  • Page Numbers: pp.50

Abstract

Refrigeration technologies used in modern societies are used to meet various needs from the operation of

technological devices to the storage of fresh foods and ventilation systems. The working principle of today's

traditional refrigeration technologies is based on traditional gas compression systems. The gases contained in the

cooling technologies can cause environmentally harmful liquids and greenhouse gas production. To minimize

these environmental problems, more cost-effective, environmentally friendly energy-free cooling system is being

investigated as an alternative to traditional methods. Moreover, one of the main problems of conventional cooling

systems is their low efficiency. Instead of these energy-intensive systems, high-efficiency alternative cooling

technologies should be developed. For this purpose, solid-state cooling systems that exhibit magnetocaloric,

electrocaloric and superelastic effects are being investigated extensively worldwide. The development of

superelastic cooling applications is directly proportional to the development of high-performance superelastic

materials. Among the properties of a good superelastic material, the mechanical strength under stress must have a

high entropy change. The best-known alloys with these properties are composed of alloys having shape memory

properties. Due to the martensitic properties of these Ni-based and Cu-based alloys, major changes in structural

phase transition and entropy are observed. This entropy change causes a temperature change in the material.

Superelastic cooler designs can be made by using these materials in suitable mechanisms by removing this

temperature change from the environment with the help of coolant.

This study covers the examination of superelastic cooling systems that promise efficient and environmentally

friendly energy that will not increase carbon emissions and will not produce harmful gases and greenhouse effects.

To achieve this result, NiTi alloys are produced by using arc melter and investigate the structural properties by

using the X-ray diffraction device, scanning electron microscope and temperature changes in the material due to

stress within the mechanical measurement device.

Keywords: Superelastic, NiTi, Cooling Technologies