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

F. De Luca, Paul Nnamchi, Abdurauf Younes, A. T. Fry, Sergio Gonzalez Sanchez

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
20 Downloads (Pure)

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 400C for 5min after annealing at 400C 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.
Original languageEnglish
Pages (from-to)337-343
Number of pages6
JournalJournal of Alloys and Compounds
Volume781
Early online date7 Dec 2018
DOIs
Publication statusPublished - 15 Apr 2019

Fingerprint

Dive into the research topics of 'Stress-induced martensitic transformation of Cu50Zr50 shape memory alloy optimized through microalloying and co-microalloying: English'. Together they form a unique fingerprint.

Cite this