Stress-induced transformation behavior of a polycrystalline NiTi shape memory alloy: Micro and macromechanical investigations via in situ optical microscopy

L. Catherine Brinson*, Ina Schmidt, Rolf Lammering

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

275 Scopus citations

Abstract

An experimental investigation of the micro and macromechanical transformation behavior of polycrystalline NiTi shape memory alloys was undertaken. Special attention was paid to macroscopic banding, variant microstructure, effects of cyclic loading, strain rate and temperature effects. Use of an interference filter on the microscope enabled observation of grain boundaries and martensitic plate formation and growth without recourse to etching or other chemical surface preparation. Key results of the experiments on the NiTi include observation of localized plastic deformation after only a few cycles, excellent temperature and stress relaxation correlation, a refined definition of "full transformation" for polycrystalline materials, and strain rate dependent effects. Several of these findings have critical implications for understanding and modeling of shape memory alloy behavior.

Original languageEnglish (US)
Pages (from-to)1549-1571
Number of pages23
JournalJournal of the Mechanics and Physics of Solids
Volume52
Issue number7
DOIs
StatePublished - Jul 2004

Keywords

  • Microstructure
  • NiTi
  • Optical microscopy
  • Phase transformations
  • Shape memory

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Stress-induced transformation behavior of a polycrystalline NiTi shape memory alloy: Micro and macromechanical investigations via in situ optical microscopy'. Together they form a unique fingerprint.

Cite this