Slender structure of nickel-titanium shape memory alloy fabricated by continuous directed energy deposition

Shiming Gao, Philip Bodunde, Mian Qin, Wei Hsin Liao*, Ping Guo

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The continuous directed energy deposition (DED) method has been utilized to process various kinds of slender structures with different materials due to its uninterrupted characteristics. The characteristics of the specimen fabricated by this continuous DED method may not be the same as that in the conventional DED method due to different temperature histories. In this study, the characteristics of NiTi shape memory alloy on phase constituent and microstructure are investigated. Results indicate that the specimen fabricated with higher laser power shows more Ti2Ni precipitation, increased defects (e.g., voids, inclusion, etc.), and larger grain size. The microstructure at different regions presents diverse morphologies, which change from columnar dendrite to equiaxed grain to columnar dendrite due to different cooling rates. The preliminary study in this paper is expected to lay the foundation for the fabrication of NiTi slender structures with the continuous DED method.

Original languageEnglish (US)
Title of host publicationActive and Passive Smart Structures and Integrated Systems XV
EditorsJae-Hung Han, Gang Wang, Shima Shahab
PublisherSPIE
ISBN (Electronic)9781510640054
DOIs
StatePublished - 2021
EventActive and Passive Smart Structures and Integrated Systems XV 2021 - Virtual, Online, United States
Duration: Mar 22 2021Mar 26 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11588
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceActive and Passive Smart Structures and Integrated Systems XV 2021
Country/TerritoryUnited States
CityVirtual, Online
Period3/22/213/26/21

Keywords

  • Additive manufacturing
  • Nickel-titanium shape memory alloy
  • Phase constituent

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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