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Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation

В. С. КомаровBaikov Institute of Metallurgy and Materials Science RAS, 119334 Moscow, RussiaR. D. KarelinBaikov Institute of Metallurgy and Materials Science RAS, 119334 Moscow, RussiaI. Yu. KhmelevskayaNational University of Science and Technology MISIS, 119049 Moscow, RussiaV. V. CherkasovNational University of Science and Technology MISIS, 119049 Moscow, RussiaV. S. YusupovBaikov Institute of Metallurgy and Materials Science RAS, 119334 Moscow, RussiaGrzegorz KorpałaInstitute of Metal Forming, TU Bergakademie Freiberg, 09599 Freiberg, GermanyRudolf KawallaInstitute of Metal Forming, TU Bergakademie Freiberg, 09599 Freiberg, GermanyUlrich PrahlInstitute of Metal Forming, TU Bergakademie Freiberg, 09599 Freiberg, GermanyС. Д. ПрокошкинNational University of Science and Technology MISIS, 119049 Moscow, Russia

2023en

ABI

Annotatsiya

The effect of a promising method of performing a thermomechanical treatment which provides the nanocrystalline structure formation in bulk NiTi shape memory alloy samples and a corresponding improvement to their properties was studied in the present work. The bi-axial severe plastic deformation of Ti-50.7at.%Ni alloy was carried out on the MaxStrain module of the Gleeble system at 350 and 330 °C with accumulated true strains of e = 6.6–9.5. The obtained structure and its mechanical and functional properties and martensitic transformations were studied using DSC, X-ray diffractometry, and TEM. A nanocrystalline structure with a grain/subgrain size of below 80 nm was formed in bulk nickel-enriched NiTi alloy after the MaxStrain deformation at 330 °C with e = 9.5. The application of MaxStrain leads to the formation of a nanocrystalline structure that is characterized by the appearance of a nano-sized grains and subgrains with equiaxed and elongated shapes and a high free dislocation density. After the MaxStrain deformation at 330 °C with e = 9.5 was performed, the completely nanocrystalline structure with the grain/subgrain size of below 80 nm was formed in bulk nickel-enriched NiTi alloy for the first time. The resulting structure provides a total recoverable strain of 12%, which exceeds the highest values that have been reported for bulk nickel-enriched NiTi samples.

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Identifikatorlar

DOI: 10.3390/ma16020511

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