Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States
The effect of quasi-continuous (QC) equal-channel angular pressing (ECAP) in various pre-aged states on the structure formation and mechanical and functional properties of a hyper-equiatomic titanium nickelide (TiNi) shape memory alloy is studied. QC ECAP with a channel intersection angle of 110° is...
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MDPI AG
2023-10-01
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| author | Roman Karelin Victor Komarov Vladimir Cherkasov Irina Khmelevskaya Vladimir Andreev Vladimir Yusupov Sergey Prokoshkin |
| author_facet | Roman Karelin Victor Komarov Vladimir Cherkasov Irina Khmelevskaya Vladimir Andreev Vladimir Yusupov Sergey Prokoshkin |
| author_sort | Roman Karelin |
| collection | DOAJ |
| description | The effect of quasi-continuous (QC) equal-channel angular pressing (ECAP) in various pre-aged states on the structure formation and mechanical and functional properties of a hyper-equiatomic titanium nickelide (TiNi) shape memory alloy is studied. QC ECAP with a channel intersection angle of 110° is carried out at a temperature of 450 °C after aging for 1 and 5 h for three passes. To investigate the obtained structure and properties, the following research methods are applied: transmission electron microscopy, XRD analysis, calorimetric study, tension and hardness tests, and a special technique for the determination of functional properties. QC ECAP allows for the considerable refinement of structural elements and results in obtaining a mixed fine-grade structure, with structural elements of average sizes of 92 nm after pre-aging for 1 h and 115 nm after pre-aging for 5 h. Pre-aging for 5 h before QC ECAP, in combination with QC ECAP and post-deformation aging at 430 °C for 1 h, provides the best combination of mechanical and functional properties: a dislocation yield stress of 1410 MPa, ultimate tensile strength of 1562 MPa, and total recoverable strain of 11.6%. These values are comparable with the best results obtained for titanium nickelide and expand opportunities for the application of smart shape memory devices. |
| first_indexed | 2024-03-09T16:37:18Z |
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| id | doaj.art-86a0964ee7ae4d659aacc4b7dbb0da73 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T16:37:18Z |
| publishDate | 2023-10-01 |
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| spelling | doaj.art-86a0964ee7ae4d659aacc4b7dbb0da732023-11-24T14:55:45ZengMDPI AGMetals2075-47012023-10-011311182910.3390/met13111829Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged StatesRoman Karelin0Victor Komarov1Vladimir Cherkasov2Irina Khmelevskaya3Vladimir Andreev4Vladimir Yusupov5Sergey Prokoshkin6National University of Science and Technology MISIS, Moscow 119049, RussiaNational University of Science and Technology MISIS, Moscow 119049, RussiaNational University of Science and Technology MISIS, Moscow 119049, RussiaNational University of Science and Technology MISIS, Moscow 119049, RussiaBaikov Institute of Metallurgy and Materials Science RAS, Moscow119334, RussiaBaikov Institute of Metallurgy and Materials Science RAS, Moscow119334, RussiaNational University of Science and Technology MISIS, Moscow 119049, RussiaThe effect of quasi-continuous (QC) equal-channel angular pressing (ECAP) in various pre-aged states on the structure formation and mechanical and functional properties of a hyper-equiatomic titanium nickelide (TiNi) shape memory alloy is studied. QC ECAP with a channel intersection angle of 110° is carried out at a temperature of 450 °C after aging for 1 and 5 h for three passes. To investigate the obtained structure and properties, the following research methods are applied: transmission electron microscopy, XRD analysis, calorimetric study, tension and hardness tests, and a special technique for the determination of functional properties. QC ECAP allows for the considerable refinement of structural elements and results in obtaining a mixed fine-grade structure, with structural elements of average sizes of 92 nm after pre-aging for 1 h and 115 nm after pre-aging for 5 h. Pre-aging for 5 h before QC ECAP, in combination with QC ECAP and post-deformation aging at 430 °C for 1 h, provides the best combination of mechanical and functional properties: a dislocation yield stress of 1410 MPa, ultimate tensile strength of 1562 MPa, and total recoverable strain of 11.6%. These values are comparable with the best results obtained for titanium nickelide and expand opportunities for the application of smart shape memory devices.https://www.mdpi.com/2075-4701/13/11/1829shape memory alloysTiNisevere plastic deformationECAPnanostructured materialsaging |
| spellingShingle | Roman Karelin Victor Komarov Vladimir Cherkasov Irina Khmelevskaya Vladimir Andreev Vladimir Yusupov Sergey Prokoshkin Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States Metals shape memory alloys TiNi severe plastic deformation ECAP nanostructured materials aging |
| title | Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States |
| title_full | Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States |
| title_fullStr | Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States |
| title_full_unstemmed | Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States |
| title_short | Structure and Properties of TiNi Shape Memory Alloy after Quasi-Continuous Equal-Channel Angular Pressing in Various Aged States |
| title_sort | structure and properties of tini shape memory alloy after quasi continuous equal channel angular pressing in various aged states |
| topic | shape memory alloys TiNi severe plastic deformation ECAP nanostructured materials aging |
| url | https://www.mdpi.com/2075-4701/13/11/1829 |
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