Special microstructures and twin features in Ti50Ni 50-X(Pd,Au)X at small hysteresis

Rémi Delville, Hui Shi, Richard D. James, Dominique Schryvers

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

3 Scopus citations

Abstract

The breaking of symmetry due to atomic displacements in the austenite-martensite phase transformation generally leads to their crystallographic incompatibility. Energy minimizing accommodation mechanisms such as martensite twinning have been recently shown to be a source of hysteresis and irreversible plastic deformation. Compatibility between the two phases can however be achieved by carefully tuning lattice parameters through composition change. A dramatic drop in hysteresis and novel microstructures such as a lowering of the amount of twin lamella are then observed. Related theoretical and simulation works also support the existence of such microstructures including peculiar self-accommodating configurations at near-compatibility. We present the transmission electron microscopy (TEM) study of these novel microstructures for the alloy systems Ti50Ni 50-xPdx and Ti50Ni50-xAux where the composition was systemically tuned to approach perfect compatibility. High resolution imaging of the interface between austenite and martensite supplies evidences of compatibility at the atomic level.

Original languageEnglish (US)
Title of host publicationSolid-Solid Phase Transformations in Inorganic Materials
PublisherTrans Tech Publications Ltd
Pages105-110
Number of pages6
ISBN (Print)9783037851432
DOIs
StatePublished - 2011

Publication series

NameSolid State Phenomena
Volume172-174
ISSN (Print)1012-0394

Keywords

  • Hysteresis
  • Interfaces
  • Martensitic transformation
  • Transmission electron microscopy

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