Creep characteristics of alumina, nickel aluminate spinel, zirconia composites

R. Peter Dillon, Dong Kyu Kim, Joy E. Trujillo, Waltraud M. Kriven, Martha L. Mecartney

Research output: Contribution to journalArticlepeer-review


Fine grained, three-phase ceramic composites that exhibit favorable toughness, hardness, and high room-temperature strength were evaluated for high-temperature mechanical stability. A 50vol%Al2O3-25vol%NiAl2 O4-25vol%3 mol%yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) and a 33vol% Al2O3-33vol% NiAl2O4-33 vol%3Y-TZP composite were compression creep tested at temperatures between 1350 and 1450°C under constant stresses of 20-45 MPa. The three-phase microstructure effectively limited grain growth (average d0 = 1.3 μm, average df = 1.6 μm after 65% true strain). True strain rates were 10-4 to 10-6 s-1 with stress exponents n = 1.7 to 1.8 and a grain-size exponent p = 1.3. A method for compensating for grain growth is presented using stress jump tests. The apparent activation energy for high-temperature deformation for 50vol%Al2O3-25vol%NiAl2 O4-25vol%3Y-TZP was found to be 373 kJ/mol-K.

Original languageEnglish (US)
Pages (from-to)556-564
Number of pages9
JournalJournal of Materials Research
Issue number2
StatePublished - Feb 2008

ASJC Scopus subject areas

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


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