Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation
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 T...
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| author | Victor Komarov Roman Karelin Irina Khmelevskaya Vladimir Cherkasov Vladimir Yusupov Grzegorz Korpala Rudolf Kawalla Ulrich Prahl Sergey Prokoshkin |
| author_facet | Victor Komarov Roman Karelin Irina Khmelevskaya Vladimir Cherkasov Vladimir Yusupov Grzegorz Korpala Rudolf Kawalla Ulrich Prahl Sergey Prokoshkin |
| author_sort | Victor Komarov |
| collection | DOAJ |
| description | 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 <i>e</i> = 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 <i>e</i> = 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 <i>e</i> = 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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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:51:26Z |
| publishDate | 2023-01-01 |
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| spelling | doaj.art-5d308f925c5e4f3691478bca2c5665d02023-11-30T23:14:17ZengMDPI AGMaterials1996-19442023-01-0116251110.3390/ma16020511Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial DeformationVictor Komarov0Roman Karelin1Irina Khmelevskaya2Vladimir Cherkasov3Vladimir Yusupov4Grzegorz Korpala5Rudolf Kawalla6Ulrich Prahl7Sergey Prokoshkin8Baikov Institute of Metallurgy and Materials Science RAS, 119334 Moscow, RussiaBaikov Institute of Metallurgy and Materials Science RAS, 119334 Moscow, RussiaNational University of Science and Technology MISIS, 119049 Moscow, RussiaNational University of Science and Technology MISIS, 119049 Moscow, RussiaBaikov Institute of Metallurgy and Materials Science RAS, 119334 Moscow, RussiaInstitute of Metal Forming, TU Bergakademie Freiberg, 09599 Freiberg, GermanyInstitute of Metal Forming, TU Bergakademie Freiberg, 09599 Freiberg, GermanyInstitute of Metal Forming, TU Bergakademie Freiberg, 09599 Freiberg, GermanyNational University of Science and Technology MISIS, 119049 Moscow, RussiaThe 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 <i>e</i> = 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 <i>e</i> = 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 <i>e</i> = 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.https://www.mdpi.com/1996-1944/16/2/511shape memory alloysNiTisevere plastic deformationnanostructured materials |
| spellingShingle | Victor Komarov Roman Karelin Irina Khmelevskaya Vladimir Cherkasov Vladimir Yusupov Grzegorz Korpala Rudolf Kawalla Ulrich Prahl Sergey Prokoshkin Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation Materials shape memory alloys NiTi severe plastic deformation nanostructured materials |
| title | Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation |
| title_full | Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation |
| title_fullStr | Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation |
| title_full_unstemmed | Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation |
| title_short | Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation |
| title_sort | evolution of structure and properties of nickel enriched niti shape memory alloy subjected to bi axial deformation |
| topic | shape memory alloys NiTi severe plastic deformation nanostructured materials |
| url | https://www.mdpi.com/1996-1944/16/2/511 |
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