Synchrotron x-ray study of texture in cold-worked shape-memory NiTi-wires

Andreas Schuster, Heinz Voggenreiter, Dorian K. Balch, David C. Dunand

Research output: Contribution to journalArticle

Abstract

A series of martensitic, near-equiatomic NiTi shape-memory alloy wires was deformed to strains ranging from 1 to 40% up to stresses of 920 MPa. After deformation, the wires were exposed to a monochromatic, parallel beam of high energy x-rays oriented perpendicular to the wire axis. The transmitted low index diffraction rings show that martensitic texture is increasing with prestrain up to ε=15% after twinning is complete. Further prestraining in the plastic range lowers the texture again indicating that twinning- and plasticity-textures cancel partially each other. Also, deformed NiTi-wires were heated and cooled from 20°C to 200°C under a small constant stress of 6 MPa. The strain change due to the Two-Way Shape-Memory Effect was measured and correlated to the diffraction results.

Original languageEnglish (US)
Pages (from-to)[d]EE2.6.1-EE2.6.6
JournalMaterials Research Society Symposium - Proceedings
Volume678
StatePublished - Jan 1 2001

ASJC Scopus subject areas

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

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