Thickness Effects on the Martensite Transformations and Mechanical Properties of Nanocrystalline NiTi Wires.

Autor: Baigonakova GA; Laboratory of Superelastic Biointerfaces, National Research Tomsk State University, 36 Lenin Ave., 634045 Tomsk, Russia., Marchenko ES; Laboratory of Superelastic Biointerfaces, National Research Tomsk State University, 36 Lenin Ave., 634045 Tomsk, Russia., Kovaleva MA; Laboratory of Superelastic Biointerfaces, National Research Tomsk State University, 36 Lenin Ave., 634045 Tomsk, Russia., Chudinova EA; Laboratory of Superelastic Biointerfaces, National Research Tomsk State University, 36 Lenin Ave., 634045 Tomsk, Russia., Volinsky AA; Laboratory of Superelastic Biointerfaces, National Research Tomsk State University, 36 Lenin Ave., 634045 Tomsk, Russia.; Department of Mechanical Engineering, University of South Florida, 4202 E. Fowler Ave. ENG030, Tampa, FL 33620, USA., Zhang Y; School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China.
Jazyk: angličtina
Zdroj: Nanomaterials (Basel, Switzerland) [Nanomaterials (Basel)] 2022 Dec 14; Vol. 12 (24). Date of Electronic Publication: 2022 Dec 14.
DOI: 10.3390/nano12244442
Abstrakt: This paper studied the features of the martensitic transformations and mechanical properties of 40, 60, and 90 µm thick NiTi wires with nanocrystalline B2 structures. It was established that the wires were composites and consisted of a TiNi matrix and a TiO 2 + TiNi 3 surface layer. Structural methods showed that the wire matrix was formed by grains of up to 20 nm in size. The method of measuring the electrical resistivity during cooling and heating revealed a two-stage nature of the martensitic transformation. Cyclic loading-unloading demonstrated that all the samples exhibited superelasticity effects and completely restored their shape when unloaded from a 4-8% relative strain at room temperature. An increase in mechanical characteristics with respect to the wire thickness was experimentally established. This was due to the change in the composition of the TiNi matrix during drawing.
Databáze: MEDLINE
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