Susceptibility to environmentally induced cracking of laser-welded NiTi wires in Hanks’ solution at open-circuit potential

C. W. Chan, H. C. Man, T. M. Yue

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In the present study the tensile and super-elastic behaviours of laser-welded NiTi wires in Hanks’ solution at open-circuit potential (OCP) were investigated using tensile and cyclic slow-strain-rate tests (SSRT). In comparison with NiTi weldment tested in oil (non-corrosive environment), the weldment in Hanks’ solution suffered from obvious degradation in the tensile properties as evidenced by lower tensile strength, reduced maximum elongation, and a brittle fracture mode. Moreover, a larger residual strain was observed in the weldment after stress–strain cycles in Hanks’ solution. In addition to the microstructural defects resulting from the welding process, the inferior tensile and super-elastic behaviours of the NiTi weldment in Hanks’ solution could be attributed to the trapping of a large amount of hydrogen in the weld zone and heat-affected zone.
Original languageEnglish
Pages (from-to)38-47
Number of pages10
JournalMaterials Science and Engineering A
Volume544
Early online date09 Mar 2012
DOIs
Publication statusPublished - 15 May 2012

Keywords

  • Nanoindentation
  • Strain Measurement
  • Shape Memory Alloys
  • Welding
  • Hydrogen embrittlement

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Susceptibility to environmentally induced cracking of laser-welded NiTi wires in Hanks’ solution at open-circuit potential'. Together they form a unique fingerprint.

Cite this