Shape memory effect and superelasticity of Ni-free Ti-Nb-based alloys
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- Ni-free Ti-Nb-based alloys, shape memory effect, superelasticity
Ni-Free Ti-Nb-based alloys have potential application as non-toxic shape memory and superelastic alloys. The shape memory behavior and superelasticity of free-Ni Ti-Nb-based alloys were described and discussed in this paper. It was shown that the excellent shape memory behavior and superelasticity can be obtained by a reasonable chemical composition and heat treatments. -Ti-Nb alloys undergo a martensitic transformation when the alloys are rapidly cooled from the phase region at high temperatures. This transformation produces , or ,, martensite. The transformation from phase to ,, martensite is a thermoelastic one and thereby produces shape memory effect and superelasticity. The start temperature of martensitic transformation (Ms) decreases with increasing Nb contents. Nb contents are located between 22-26 (at.%) among the reported Ti-Nb alloys since the superelasticity at room temperature exists when the Ti-Nb alloys have the compositions of 22-26at.%Nb. The addition of the elements such as Zr, Sn, O and Al has influences on the shape memory effect and superelasticity of Ti-Nb alloys, which decreases Ms and increases superelasticity. Ti-22Nb-4Zr (at.%) and Ti-24Nb-3Al (at.%) possesses large recovery strain. The maximum recovery strain is 4.3% for the former and 4.7% for the latter, respectively.
- © 2016, the Authors. Published by Atlantis Press.
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- This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
Cite this article
TY - CONF AU - Zhengcun Zhou AU - Dewen Guo AU - Jie Du AU - Suyi Gu PY - 2016/01 DA - 2016/01 TI - Shape memory effect and superelasticity of Ni-free Ti-Nb-based alloys BT - Proceedings of the 2015 4th International Conference on Sensors, Measurement and Intelligent Materials PB - Atlantis Press SP - 531 EP - 536 SN - 2352-538X UR - https://doi.org/10.2991/icsmim-15.2016.98 DO - https://doi.org/10.2991/icsmim-15.2016.98 ID - Zhou2016/01 ER -