Mechanical and Functional Properties of Ti48.6Ni49.6Co1.8 Shape Memory Alloy
Roman D. Karelin, Vladimir A. Andreev, Irina Yu. Khmelevskaya, Sergey D. Prokoshkin, Natalia N. Resnina, Viktor S. Komarov, Sofya A. Bondareva, Vladimir S. Yusupov
Abstract. Mechanical and functional properties of Ti48.6Ni49.6Co1.8 shape memory alloy rods with diameters of 3.5 and 4.5 mm were studied after rotary forging (RF). The structure was analyzed using optical microscopy. Mechanical properties were determined by uniaxial tensile and Rockwell hardness tests. Temperature range of martensitic transformations was defined by differential scanning calorimetry. Superelasticity effect was studied by a thermomechanical method using bending tests. The obtained results showed that RF at 450 °C and RF + annealing at 450 °C, 1 hour allow manufacturing 3 m-long Ti-Ni-Co rods with diameters of 3.5 and
4.5 mm with improved mechanical properties: (RF: σB = 1180 MPa, σ0.2 = 625 MPa, δ = 15 % and σB = 1205 MPa, σ0.2 = 622, δ = 16 %, respectively; RF+ annealing: σB = 1292 MPa,
σ0.2 = 651, δ = 19 % and σB = 1228 MPa, σ0.2 = 575 MPa, δ = 21 %, respectively). The temperature range of superelastic behavior was determined as ‒30 to 20 °C with the value of completely maximum superelastic strain – 5.0 %.
Keywords
Shape Memory Alloys, Titanium Nickelide, Thermomechanical Treatment, Rotary Forging, Functional Properties, Superelasticity
Published online 11/15/2018, 5 pages
Copyright © 2018 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: Roman D. Karelin, Vladimir A. Andreev, Irina Yu. Khmelevskaya, Sergey D. Prokoshkin, Natalia N. Resnina, Viktor S. Komarov, Sofya A. Bondareva, Vladimir S. Yusupov, ‘Mechanical and Functional Properties of Ti48.6Ni49.6Co1.8 Shape Memory Alloy’, Materials Research Proceedings, Vol. 9, pp 19-23, 2018
DOI: https://dx.doi.org/10.21741/9781644900017-4
The article was published as article 4 of the book Shape Memory Alloys
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