The influence of silicon on topographical parameters and mechanical properties of the Ti-Ni-Ta-Si surface alloy synthesized on the NiTi-substrates

• Published in: Journal of physics. Conference series 2021-08, Vol.1989 (1), p.12003
• Main Authors: D’yachenko, F A, Atovullaeva, A A, Yakovlev, E V, Meisner, L L
• Format: Article
• Language: English
• Subjects: Elastic deformation; Elastic recovery; Electron beams; Indentation; Intermetallic compounds; Mechanical properties; Nickel base alloys; Nickel compounds; Nickel titanides; Parameters; Shape memory alloys; Silicon; Substrates; Superelasticity; Surface alloying; Surface layers; Synthesis; Titanium base alloys; Titanium compounds
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/1989/1/012003

This work comprises a study of the effect of silicon on the topographical parameters and mechanical properties of the Ti-Ni-Ta-Si surface alloy (SA) synthesized on the NiTi-substrates by the additive thin-film electron-beam method. It was found that the roughness of [Ti-Ni-Ta-Si]SA (~0.095 μm) has a lower value than in [Ti-Ni-Ta]SA (~0.195 μm). The values of the yield strength σ y in the surface layers of [Ti-Ni-Ta-Si]SA and [Ti-Ni-Ta]SA are characterized by a gradient decrease from ~4.2 GPa up to ~1.2 and ~1.7 GPa, respectively. During the indentation, evaluation of the deformation behavior (recovered elastic –ε elast , and superelastic – εin the surface layers of SE , residual plastic – ε elast deformation) showed, that in surface layers of [Ti-Ni-Ta-Si]SA and [Ti-Ni-Ta]SA due to an increase of ε elast , there was a decrease in ε SE up to ~35 and ~22%, respectively (for the NiTi-initial ε SE ≈ 38%).