Effect of stoichiometry on shape memory properties of Ti-Ni-Hf-Cu-Nb shape memory alloys manufactured by sus-pended droplet alloying

Sheng Li, Minshi Wang, Khamis Essa, Chunlei Gan, Chunyan Liu, Moataz Attallah*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

A novel Ti-Ni-Hf-Cu-Nb shape memory alloy has been developed by a new combinatorial alloy synthesis method, the Suspended Droplet Alloying. The influence of alloying elements on the transformation temperature, the microstructure and the shape memory effect of this alloy have also been studied. It was found that Cu has a greater negative influence on the transformation temperature of Ti-Ni-Hf-CuX alloys (about -5 K/at.%) than on the Ti-Ni-CuX alloys (-0.67 K/at.%). In addition, the negative effect intensifies with increasing Hf content. The transformation temper-ature rapidly decreases with increasing Nb composition in the Ti-Ni-Cu-Nb and Ti-Ni-Hf-Cu-Nb alloys, with the solid solution of Nb in the matrix being 1 at.%. A Ti-Ni-Cu-Hf-Nb alloy with high thermal cycle stability has been developed, where the alloying elements affect the transfor-mation behaviour via altering the slipping energy and forming different types of precipitations.
Original languageEnglish
Pages (from-to)1-21
Number of pages21
JournalSolids
Volume3
Issue number1
DOIs
Publication statusPublished - 5 Jan 2022

Bibliographical note

Funding Information:
This work was financially supported by the [Guangzhou Science and Technology Plan Programme] (Project No. 201704030067) and was carried out in collaboration with Guangdong Academy of Sciences and the University of Birmingham. This project is also supported by the Accelerated Metallurgy Project, co-funded by the [European Commission in the seventh Framework Programme] (Contract NMP4-LA-2011-263206), by the [European Space Agency] and by the individual partner organisations.

Publisher Copyright:
© 2022 by the authors.

Keywords

  • martensitic transformation
  • microstructure
  • shape memory alloys
  • Ti-Ni-Hf-Cu-Nb alloys

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Materials Science (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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