Wire and arc additive manufacturing of a Ni-rich NiTi shape memory alloy: Microstructure and mechanical properties

Z. Zeng, B. Q. Cong, J. P. Oliveira, W. C. Ke, N. Schell, B. Peng, Z. W. Qi, F. G. Ge, W. Zhang, S. S. Ao

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Wire and Arc Additive Manufacturing (WAAM) was used for fabrication of NiTi parts using a commercialy available Ni-rich NiTi wire as the feedstock material. The as-built parts are near fully austenitic at room temperature as confirmed by differential scanning calorimetry, X-ray diffraction and superelastic cycling. The as-built microstructure changed from collumnar, in the first deposited layers, to equiaxed in the last deposited ones as a result of the different thermal cycle conditions. This is the first work where WAAM NiTi parts exhibit superelastic behavior under tensile conditions, highlighting the potential use of the technique for the creation of parts shaped in a complex manner based on this material and process. The potential to use WAAM for deposition of advanced functional materials is demonstrated.

Original languageEnglish
Article number101051
JournalAdditive Manufacturing
Volume32
DOIs
Publication statusPublished - 1 Mar 2020

Keywords

  • Digital image correlation
  • Microstructure
  • NiTi shape memory alloy
  • Phase transformation
  • Wire and arc additive manufacturing

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