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

Research output: Contribution to journalArticlepeer-review

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
JournalSolids
Volume3
Issue number1
DOIs
Publication statusPublished - 5 Jan 2022

Keywords

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

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