Cel A new set of the physical and mechanical properties may be achieved by lowering the grain size up to nanocrystalline level and reaching definite chemical non-homogeneity of the solid solution. Besides well-known methods of traditional metallurgy and treatment for production of materials with sub-micro-crystalline and nanocrystalline components of the amorphous structure, a new method is developed, based on cycled reversible martensite transformations in Fe-based alloys.The main items to be studied during the project realization are as follows:- mechanism of direct MT at cryogenic temperatures (20 K-300 K)- mechanism of reverse MT and accompanied processes;- accumulation of the crystal structure internal defects and internal stresses;- development of fragmentation, grain size diminution and domain structure formation;- processes of the chemical non-homogeneity and alloying element decomposition during reverse MT and during multiple direct and reverse MT cycles in the iron-based alloys with non-equilibrium structure;- the mechanism of the austenite re-crystallization under multiple cycles of the direct and reverse martensite transformation sequences with increasing density of crystal structure defects will be determined in alloys with varied stacking fault energy (Fe-Ni and Fe-Mn alloys)- the conditions for the formation of the nanocrystalline structure under cycled direct and reverse MTs in the iron-based alloys will be determined.The fulfilment of the project activity program allows to develop the physical principles of the nanocrystalline structure formation during the processes of the g-phase variants distribution through the bcc-fcc-bcc transformation cycles and atomic redistribution in Fe-based alloys.These general rules will also apply to the production of alloys with controlled thermal expansion coefficient (TEC) and high-strength magnetic materials with rectangular magnetic hysteresis loop.Expected results for application purposes are seen as follows:- development of the bcc magnetic alloys with increased strength (s0.2>1500MPa) and almost rectangular magnetic hysteresis loop; these magnetic alloys may be used as a material for production of disk-type rotors of the high-speed hysteretic electrical motors;- development of the fcc alloys the thermal expansion coefficient of which ranges widely from 2x10-6 K-1 up to 11x10-6 K-1 without variation of the alloy chemical composition; alloys with controlled thermal expansion coefficient may be used in various type regulators for automatization process systems, such as high-strength temperature sensitive details of high mechanical accuracy devices. Program(-y) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Temat(-y) 1B - Condensed Matter, Optics and Plasma Physics OPEN - OPEN Call Zaproszenie do składania wniosków Data not available System finansowania Data not available Koordynator Institut National Polytechnique de Grenoble Wkład UE Brak danych Adres rue de la Houille Blanche 961 38402 Saint Martin d'Herès cedex Francja Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (3) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko National Academy of Sciences of Ukraine Ukraina Wkład UE Brak danych Adres Vernadsky prospekt 252680 Kiev Zobacz na mapie Koszt całkowity Brak danych Uaral Division of the Russian Academy of Sciences Rosja Wkład UE Brak danych Adres 620219 Ekaterinburg Zobacz na mapie Koszt całkowity Brak danych University of Leeds Zjednoczone Królestwo Wkład UE Brak danych Adres Clarendon road LS2 9JT Leeds Zobacz na mapie Koszt całkowity Brak danych
