THE INFLUENCE OF ULTRASOUND ACTIVATION ON MICROSTRUCTURE AND HARDNESS OF POROUS Ni-Ti SHAPE MEMORY ALLOYS

Dovchinvanchig Maashaa; Tsetsegmaa Agvaantseren; Baasanjargal Narmandakh; Vasili Vasilievich Rubanik; Vasili Vasilievich Rubanik Jr.

doi:10.31435/rsglobal_ws/30092022/7863

Dovchinvanchig Maashaa School of Engineering and Technology, Mongolian University of Life Sciences, Mongolia https://orcid.org/0000-0001-6603-0542
Tsetsegmaa Agvaantseren Doctoral student, School of Mechanical Engineering and Transportation, Mongolian University of Science and Technology, Mongolia https://orcid.org/0000-0001-6902-8739
Baasanjargal Narmandakh Mongeni complex school, Mongolia https://orcid.org/0000-0002-6032-7449
Vasili Vasilievich Rubanik The Institute of Technical Acoustics of the National Academy of Sciences of Belarus, Belarus https://orcid.org/0000-0002-0350-1180
Vasili Vasilievich Rubanik Jr. The Institute of Technical Acoustics of the National Academy of Sciences of Belarus, Belarus https://orcid.org/0000-0002-9268-0167

DOI: https://doi.org/10.31435/rsglobal_ws/30092022/7863

Keywords: Shape Memory Alloy, Energy Dispersive X-Ray Spectroscopy, Hardness, Microstructure

Abstract

A Ni-Ti shape memory alloy with a porous structure is obtained by the method of self-propagating high-temperature synthesis (SHS) and investigated the possibility of changing its microstructure and hardness. The research aimed to study the changes in the microstructure and hardness of the Ni-Ti shape memory alloy with a porous structure when the Ni and Ti metal powders are preliminarily subjected to ultrasound activation for different periods. The microstructure of the alloy surfaces was studied with using a Hitachi scanning electron microscope (SEM), and the hardness was measured with a Brinell electronic hardness tester. The results of the experiments showed that the porosity and hardness of the Ni-Ti alloy enlarged with an increase in the time of ultrasound activation of the components. The innovative aspect of this study is that prior to the synthesis of powder elements with a purity of Ni 99.9% and Ti 99.9% with an average particle size of 40 μm, they were previously subjected separately to ultrasound activation at different periods.

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