Stability of pressure-dependent, thermally-induced displacive transformations in bi-atomic crystals

Ryan S. Elliott, John A. Shaw, Nicolas Triantafyllidis

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

An important property of some metallic alloys, such as NiTi, for technological applications is their coupled thermomechanical shape memory behavior. This is due to temperature-dependent first-order displacive (martensitic) transformations in which their crystal structures transform between a higher symmetry cubic phase and lower symmetry phases (rhombohedral, tetragonal, orthorhombic, or monoclinic). In a recent paper, Elliott et al. (J. Mech. Phys. Solids, in press) proposed a nano-mechanical model based on temperature-dependent atomic potentials to explicitly construct an energy density W(F;O) to find all the different equilibrium paths and their stability of a stress-free bi-atomic perfect crystal as a function of temperature. In this work we investigate the influence of hydrostatic pressure. In general, hydrostatic compression increases the critical temperatures on the principal branches. For the same absolute value, hydrostatic tension is found to have a more pronounced effect on the equilibrium paths than hydrostatic compression.

Original languageEnglish (US)
Pages (from-to)3845-3856
Number of pages12
JournalInternational Journal of Solids and Structures
Volume39
Issue number13-14
DOIs
StatePublished - Jul 3 2002

Bibliographical note

Funding Information:
The financial support from a Computational Science Graduate Fellowship from the Department of Energy (for R. Elliott) and a CAREER grant from the National Science Foundation (for J. Shaw) are acknowledged with thanks.

Keywords

  • Compression
  • Crystal
  • Stability
  • Symmetry phases

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