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Shape Memory Alloys (“SMAs”)

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The scientific direction of “Shape memory alloys” was founded in NUST “MISIS” in 1977. Professor V.A. Zaimovskiy was a scientific advisor from 1977 to 1985, Professor M.L. Bernshtein from 1985 to 1987, Professor S.D. Prokoshkin from 1987 to present. Actually the basic and applied studies of SMAs are carried out using Ti-Ni and Ti-alloys for the medical and engineering applications. The practical application of SMAs is based on their unique functional properties: an abnormally high value of recovery strain. The main objective of the study in the fundamental and searching areas is a development of methods of structure formation in SMAs for the improvement of their functional properties. The main studied parameters of SMAs are the martensitic transformation temperatures, recovery strain, recovery strain rate, recovery stress, functional fatigue life. The thermomechanical treatment (TMT) forming the nanostructure is an effective method to control the functional properties. According to the results obtained in the frame of joint NUST “MISIS” and Ecole de Technologie Superieure (ETS, Montreal, Canada) research work, TMT causing the nanostructure formation allows achieving the improved functional properties of SMAs Ti-Ni such as completely recoverable strain and recovery stress. The functional properties of Ti-Ni alloys are much higher than that of others SMAs. However, they contain toxic nickel which limits the Ti-Ni alloys application. Therefore, Ni-free Ti-Nb-based alloys are actually developed in NUST “MISIS” and ETS (Montreal, Canada), such as Ti-Nb-Zr, Ti-Nb-Ta, Ti-Nb-Zr-Ta alloys containing only biocompatible elements. These alloys allow replacing the Ti-Ni alloys as materials for medical application acting a long time in extremal conditions, for example, in the oral cavity. The main functional property of these alloys (superelastic behavior) is also optimized using TMT forming the nanostructure. The obtained and studied metallic foams for medical implants based on Ti-Nb possess the lowest value of elastic modulus (E=1-5 GPa) which matches the elastic modulus of trabecular bone tissues with porous structure and low density. Therefore, the maximal biomechanicalcompatibility can be achieved. The developed inner surface and full permeability provide the maximal implanting of metallic foams into human tissues. The main methods for the mechanical and microstructural characterization used in our laboratory are X-ray diffractometery, transmission electron microscopy, DSC, dilatometery; functional static tests, functional fatigue tests. In the applied and practical studies, the development and commercialization of medical devices are carried out according to the collaboration agreement with “Globetek 2000 Pty Ltd.” company (Melbourn, Australia). In accordance with this agreement, the medical advices based on the shape memory effect and superelasticity are patented and commercialized. Based on the permanent agreement with “Armgas-NT” Co. (Moscow), the working elements of thermomechanical valves for gas pipes are manufactured and termomechanically treated. The Ti-Ni- and Ti-Nb-based alloys are manufactured in MISIS, Central Research and Development Institute of Ferrous Metallurgy, and delivered by “SAES Getters” Co. (USA), “Industrial Center MATEK-SPE” (Moscow).


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Professor, Doctor of physical and mathematical Sciences,senior researcher of the Department of plastic deformation of special alloys
Leading Researcher, PhD, Associate Professor
Leading Researcher, PhD, Associate Professor
PhD, Senior Researcher
Postgraduate Student
Postgraduate Student
Professor, D.Sc., Professor
Postgraduate Student
Leading Researcher, PhD
PhD, Professor of Laboratory of Shape Memory Alloys and Intelligent Systems (Ecole de Technologie Superieure, Montreal, Canada), Honorary Professor of NUST "MISIS"
PhD, Senior Researcher of Laboratory of Shape Memory Alloys and Intelligent Systems (Ecole de Technologie Superieure, Montreal, Canada)
Master Student

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