Phase transformation and thermal expansion of Cu/ZrW2O8 metal matrix composites

Hermann Holzer*, David C Dunand

*Corresponding author for this work

Research output: Contribution to journalArticle

159 Scopus citations

Abstract

Powder metallurgy was used to fabricate fully dense, unreacted composites consisting of a copper matrix containing 50-60 vol% ZrW2O8 particles with negative thermal expansion. Upon cycling between 25 and 300 °C, the composites showed coefficients of thermal expansion varying rapidly with temperature and significantly larger than predicted from theory. The anomalously large expansion on heating and contraction on cooling are attributed to the volume change associated with the allotropic transformation of ZrW2O8 between its high-pressure γ-phase and its low-pressure α- or β-phases. Based on calorimetry and diffraction experiments and on simple stress estimations, this allotropic transformation is shown to result from the hydrostatic thermal stresses in the particles due to the thermal expansion mismatch between matrix and reinforcement.

Original languageEnglish (US)
Pages (from-to)780-789
Number of pages10
JournalJournal of Materials Research
Volume14
Issue number3
DOIs
StatePublished - Jan 1 1999

ASJC Scopus subject areas

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

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