Control of the twinning propensity of Cu50Zr50 shape memory alloy optimized through microalloying and co-microalloying

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Abstract


Control of the twinning propensity Cu50Zr50 shape memory alloy optimized through microalloying and co-microalloying
F. De Luca1, P. Nnamchi2, A. Younes2, A.T. Fry1, S. González2
1 National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK
2 Faculty of Engineering and Environment, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK

Abstract:
The effect of microalloying with Co or Ni individually or co-microalloying on the twinning propensity for stress-induced martensitic transformation of Cu50Zr50 at. % was investigated at different levels (i.e., nano and macro). Investigation at nano level will be performed from nanoindentation experiments by analysing the change in the slopes of (P/h)-h curves, plastic index and recovery ratio after annealing. Partial replacement of Cu by 1 at. % Ni promotes twinning but for 1 at. % Co the twinning propensity decreased. Co-microalloying using 0.5 at. % Co and Ni had an intermediate effect. Partial replacement of Cu by 1 at. % Ni from the parent Cu50Zr50 alloy, enabled to improve the recovery ratio after annealing at 400C for 5 min, from 15.6 % to 19.5 %. The results, obtained at the nanoscale, agree with those at macroscale (i.e., 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
Title of host publicationControl of the twinning propensity Cu50Zr50 shape memory alloy optimized through microalloying and co-microalloying
Publication statusPublished - 12 Jun 2019
EventInternational Conference on Materials Research and Nanotechnology 2019 - Rome, Italy
Duration: 10 Jun 201912 Jun 2019
https://conferencealerts.com/show-event?id=203369

Conference

ConferenceInternational Conference on Materials Research and Nanotechnology 2019
Country/TerritoryItaly
CityRome
Period10/06/1912/06/19
Internet address

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