Materials used for skyscrapers will be improved
Yuri Chumlyakov, head of the Laboratory of High-Strength Crystal Physics, returned from a working trip to Japan, the USA, and Taiwan. The laboratory conducts joint research with the scientific teams of these countries, the results of which improve the structure of materials with shape memory and create new alloys.
– The purpose of the visit to Japan was to discuss the next joint project with Japanese colleagues from the National Institute for Materials Science (NIMS). Collaboration with them began in 1998.
We discussed issues of further international projects to study the shape memory effect in steels, - said Yuri Chumlyakov. - These works are of practical importance because they are used as dampers for skyscrapers, which help to reduce the amplitude of oscillations from wind and earthquakes. The amazing damping properties of steel require study - to understand the fundamental mechanisms of the development of martensitic transitions under cyclic loads.
Now, TSU scientists are working with the composition FeMnCrNiSi, in which a reversible change in size is observed - the shape memory effect. During the tests, physicists conduct mechanical tests until the samples rupture at different temperatures, to determine the yield strength and ductility of the material and the magnitude of the shape memory effect. Researchers work with alloys in the form of single crystals, organic light-emitting diode crystals, and study the relationship of their orientation and functional properties. In the future, these studies will help us to move on to real polycrystalline materials.
The results will optimize the structure of steel with damping properties. This material is promising not only for the manufacture of damping systems but also for solving many other technical and environmental problems, for example, the problem of noise pollution in megacities (reducing technological noise and vibration). Along with this, damping steel parts due to increased resistance to fatigue loads can increase the safety of cars and air transport.
During a working trip, Yuri Chumlyakov visited the National University of Education (National Changhua University of Education, Changhua, Taiwan). The issue of joint work on new high-strength nonequiatomic high-entropic alloys undergoing martensitic transformations was discussed with Taiwan scientists.
Yuri Chumlyakov also visited the USA, in particular, Texas A&M University (TAMU), with whom TSU physicists have been collaborating for over 20 years. They are conducting joint research on the most advanced high-entropy shape memory alloys. Every year, the scientists have published several articles in top journals on the results of these studies.
Yu. Panchenko et al. BOL''ShIE OBRATIMYE DEFORMACII V SOSTARENNYH POD NAGRUZKOJ V MARTENSITE MONOKRISTALLAH SPLAVOV NiFeGaCo i NiMnGa, International Workshop "Multiscale Biomechanics and Tribology of Inorganic and Organic Systems" ; Mezhdunarodnaja konferencija "Perspektivnye materialy s ierarhicheskoj strukturoj dlja novyh tehnologij i nadezhnyh konstrukcij" ; VIII Vserossijskaja nauchno-prakticheskaja konferencija s mezhdunarodnym uchastiem, posvjashhennaja 50-letiju osnovanija Instituta himii nefti "Dobycha, podgotovka, transport nefti i gaza" : tezisy dokladov (2019). DOI: 10.17223/9785946218412/219
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