Stress-induced martensitic transformation of Cu50Zr50 shape memory alloy optimized through microalloying and co-microalloying

De Luca, F., Nnamchi, Paul, Younes, Abdurauf, Fry, A.T. and Gonzalez Sanchez, Sergio (2019) Stress-induced martensitic transformation of Cu50Zr50 shape memory alloy optimized through microalloying and co-microalloying. Journal of Alloys and Compounds, 781. pp. 337-343. ISSN 0925-8388

[img] Text (Full text)
De Luca et al - Stress-induced martensitic transformation of Cu50Zr50 shape memory alloy AAM.pdf - Accepted Version
Restricted to Repository staff only until 7 December 2019.
Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0.

Download (1MB) | Request a copy
Official URL: https://doi.org/10.1016/j.jallcom.2018.12.099

Abstract

The stress-induced martensitic transformation of Cu50Zr50 at. % shape memory alloy was tuned through microalloying and co-microalloying. The effect of microalloying elements Co or Ni individually or combined (i.e., co-microalloying) was investigated and compared at the macro- and nanoscale. From nanoindentation experiments, change in the slopes of (P/h)-h curves, plastic index and recovery ratio after annealing were investigated: partial replacement of Cu by 1 at. % Ni was observed to promote twinning while for 1 at. % Co the twinning propensity decreased and co-microalloying using 0.5 at. % Co and Ni had an intermediate effect. The recovery ratio of the Cu50Zr50 alloy, calculated from the volume change of a residual indent after annealing at 400 °C for 5 min after annealing at 400 °C for 5 min increased from 15.6% to 19.5% when substituting Cu by 1 at. % Ni. These results, obtained at the nanoscale, are in agreement with macroscale test observation, namely, differential scanning calorimetry and x-ray diffraction. Therefore, microalloying opens up possibilities for the development of more cost-effective CuZr alloys, with a view to develop commercial actuators that could replace costly NiTi alloys in the near future.

Item Type: Article
Uncontrolled Keywords: Shape memory alloy, Microalloying, Co-microalloying, Martensitic transformation
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Becky Skoyles
Date Deposited: 13 Dec 2018 12:39
Last Modified: 17 Apr 2019 16:00
URI: http://nrl.northumbria.ac.uk/id/eprint/37232

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics


Policies: NRL Policies | NRL University Deposit Policy | NRL Deposit Licence