FORMATION OF NANOSTRUCTURE IN TITANIUM NICKELIDE AS A RESULT OF QUAZI-CONTINUOUS ISOTHERMAL DEFORMATION
https://doi.org/10.17073/0368-0797-2016-1-69-71
Abstract
The severe plastic deformation (SPD) forming ultrafinegrained (nanocrystalline or nanosubgrained) structure is one of the most effective ways to improve the functional properties of Ti – Ni-based shape memory alloys. SPD of Ti – 50.0 at. % Ni alloy was carried out for the first time using the multi-axial deformation MaxStrain module of system at 400, 370, 350, 330 °C. Kinetics of martensitic transformations were studied by DSC method, and the structure features using X-ray diffractometry and Transmission Electron Microscopy methods. Lowering of the deformation temperature from 370 to 330 °C with increasing of accumulated strain from 4.5 to 9.5 leads to a refinement of the structural elements and formation of mixed nanosubgraine and nanocrystalline structure with high dislocation density and average grain/subgrain size of 85 nm after deformation at the lowest temperature 330 °С with the highest strain.
About the Authors
I. Yu. Khmelevskaya
National University of Science and Technology “MISIS” (MISIS) (4, Leninskii ave., Moscow, 119049, Russia)
Russian Federation
Russian Federation
Cand. Sci. (Eng.), Leading Researcher of the Chair “Metal Forming”
R. Kavalla
Technische Universität Bergakademie Freiberg (Deutschland, Bernhard-von-Cotta-Str., 4, 09599, Freiberg)
Russian Federation
Russian Federation
Director of Metalforming Institute, Dr. Sci. (Eng.), Professor
V. S. Komarov
National University of Science and Technology “MISIS” (MISIS) (4, Leninskii ave., Moscow, 119049, Russia)
Russian Federation
Postgraduate
Russian Federation
Postgraduate
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Review
For citations:
Khmelevskaya I.Yu., Kavalla R., Komarov V.S. FORMATION OF NANOSTRUCTURE IN TITANIUM NICKELIDE AS A RESULT OF QUAZI-CONTINUOUS ISOTHERMAL DEFORMATION. Izvestiya. Ferrous Metallurgy. 2016;59(1):69-71. (In Russ.) https://doi.org/10.17073/0368-0797-2016-1-69-71
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