Microstructural characterization of laser micro-welded Nitinol wires

Peng Dong, Hongmei Li, Wenxian Wang, Jun Zhou

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Laser micro-welding has been considered one of the most promising joining methods of manufacturing Nitinol biomedical devices. However, there is still a lack of understanding about how laser micro-welding influences the microstructure. This work attempts to reveal the phase content within various microstructural zones of laser micro-welded crossed Nitinol wires by transmission electron microscopy (TEM) with the assistance of the focused ion beam (FIB) technique. The base metal is composed of a single austenite phase (B2). The fusion zone exhibits the coexistence of austenite matrix and several intermetallics (T2Ni, TiNi3 and Ti3Ni4). The precipitation of R-phase was observed in HAZ with B2 matrix due to thermally induced stresses during welding.

Original languageEnglish (US)
Pages (from-to)40-45
Number of pages6
JournalMaterials Characterization
Volume135
DOIs
StatePublished - Jan 2018

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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