Microstructure and mechanical properties of Al2 O3/Y3Al5O12/ZrO2 ternary eutectic materials

J. H. Lee, A. Yoshikawa, Y. Murayama, Y. Waku, S. Hanada, T. Fukuda

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37 Citations (Scopus)

Abstract

Directionally solidified fibers and rods have been grown from the ternary Al2O3/Y3Al5O12 /ZrO2 system using micro-pulling-down method. Fiber diameter could be varied 0.3 mm-2 mm at pull-rates ranging 6-900 mm/h and 500 mm in length. The ternary eutectic fibers had homogeneous colony patterned eutectic microstructures. The interlamellar spacing λ exhibited an inverse-square-root dependence on the growth speed v according to λ = 8 × v-1/2, where λ has the dimension of μm and v is in μm/s. The tensile strength was recorded 1730 MPa at 25 °C and 1100 MPa at 1200 °C for a fiber crystals grown at a growth speed of 900 mm/h. Eutectic rods having 5 mm of diameter and up to 80 mm in length were also successfully grown by the micro-pulling-down method. The eutectic rods showed 1400 MPa of mechanical strength by compressive mode at 1500 °C with homogeneous colony microstructures.

Original languageEnglish
Pages (from-to)1411-1417
Number of pages7
JournalJournal of the European Ceramic Society
Volume25
Issue number8 SPEC. ISS.
DOIs
Publication statusPublished - 2005

Keywords

  • Microstructures
  • Strength
  • Structural application
  • Ternary eutectic

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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