Transformation-mismatch plasticity of NiAl/ZrO2 composites-finite-element modeling

Peter Zwigl, David C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

A coupled thermo-mechanical finite-element model was developed to described transformation-mismatch plasticity resulting from mismatch stresses produced by allotropic particles within a creeping matrix. A composite consisting of a NiAl matrix with 10 vol.% zirconia allotropic particles was modeled in two dimensions for a range of externally-applied stress values. The instantaneous composite strain developed during the zirconia transformation is found to increase linearly with the applied stress, in agreement with continuum-mechanical, closed-form models for transformation-mismatch plasticity. This instantaneous strain is smaller than the total strain accumulated over a half temperature cycle, indicating that mismatch stresses produced during the transformation relax by matrix creep long after the particles have transformed. Also, the total composite strain calculated after a full temperature cycle is in good agreement with strains determined experimentally on a NiAl-10% ZrO2 composite. Finally, the internal stress distribution within the transforming composite is determined numerically and compared to simple analytical averages.

Original languageEnglish (US)
Pages (from-to)128-136
Number of pages9
JournalMaterials Science and Engineering A
Volume335
Issue number1-2
DOIs
StatePublished - Sep 25 2002

Keywords

  • Finite-element modeling
  • NiAl
  • Phase transformations
  • Superplasticity
  • ZrO

ASJC Scopus subject areas

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

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