Abstract
This paper deals with Ni-Ti46 and Ni-Ti-X wt. % alloys prepared by arc re-melting under argon protective atmosphere. The melting was repeated three times to obtain a homogenous chemical composition of samples. Niobium, vanadium and silicon were chosen as alloying elements and they were added into the alloy in an amount of 5 wt. %. Microstructure, phase composition, hardness and transformation behaviour were investigated parameters. Properties of cast alloys are compared with alloys of the same chemical composition prepared by powder metallurgy method – self-propagating high-temperature synthesis (SHS). Arc re-melting produced a more homogeneous microstructure with a lower content of the Ti2Ni phase than powder metallurgy methods in case of Ni-Ti-X alloys. Quite a high amount of the secondary phase (a mixture of the Ni2Ti, NiTi and Ti2Ni phases) was created in the microstructure of Ni-Ti46 wt. % alloy. The addition of silicon caused an increase of transformation temperatures and hardness.
Highlights
Shape memory alloys have exceptional properties like superelasticity and One- and Two-ways shape memory effect
The NiTi phase and mixture of NiTi, Ti2Ni and Ni2Ti phases were observed in the microstructure of the Ni-Ti46 alloy and it is in a good agreement with X-ray diffraction analysis (XRD) analysis
The mixture of NiTi, Ti2Ni and Ni2Ti phases takes approximately 41.2 % of area fraction in NiTi46 alloy and NiTiV5 alloy is consisted of 9.6 % area fraction of the Ti2Ni phase
Summary
Shape memory alloys have exceptional properties like superelasticity and One- and Two-ways shape memory effect. This work is focused on properties of Ni-Ti shape memory with addition of an alloying element and it compares the influence of the alloying elements on Ni-Ti alloys prepared by melting and powder metallurgy methods. %) and mixture of NiTi, Ti2Ni and Ni2Ti phases were observed in the microstructure of the Ni-Ti46 alloy and it is in a good agreement with XRD analysis (see phase compositions of samples in Tab. 1).
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