Processing and Characterization of Liquid-Phase Sintered NiTi Woven Structures

Dinc Erdeniz*, Ryan P. Weidinger, Keith W. Sharp, David C. Dunand

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Porous NiTi is of interest for bone implants because of its unique combination of biocompatibility (encouraging osseointegration), high strength (to prevent fracture), low stiffness (to reduce stress shielding), and shape memory or superelasticity (to deploy an implant). A promising method for creating NiTi structures with regular open channels is via 3D weaving of NiTi wires. This paper presents a processing method to bond woven NiTi wire structures at contact points between wires to achieve structural integrity: (i) a slurry consisting of a blend of NiTi and Nb powders is deposited on the surface of the NiTi wires after the weaving operation; (ii) the powders are melted to create a eutectic liquid phase which collects at contact points; and (iii) the liquid is solidified and binds the NiTi woven structures. The bonded NiTi wire structures exhibited lower transformation temperatures compared to the as-woven NiTi wires because of Nb diffusion into the NiTi wires. A bonded woven sample was deformed in bending and showed near-complete recovery up to 6% strain and recovered nearly half of the deformation up to 19% strain.

Original languageEnglish (US)
Pages (from-to)70-76
Number of pages7
JournalShape Memory and Superelasticity
Volume4
Issue number1
DOIs
StatePublished - Mar 1 2018

Keywords

  • Mechanical behavior
  • NiTi
  • Shape memory
  • Transient-liquid phase

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science(all)

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