Texture control and high-temperature strength of directionally solidified Al2O3/YAG/ZrO2 eutectic composite rods

Yonosuke Murayama, Shuji Hanada, Jong Ho Lee, Akira Yoshikawa, Tsuguo Fukuda

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A2O3/YAG/ZrO2 eutectic Melt-Growth-Composite (MGC) rods with two different microstructures were prepared by unidirectional solidification using the modified-pulling-down method (MPD) under different processing parameters. Microstructure and crystallographic texture were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and electron backscattered pattern (EBSP) method. High-temperature strength was evaluated by compression tests at 1773 K and 1873 K. Geometric pattern structure and Chinese script pattern structure are evolved by controlling processing parameters. MPD rods have strong preferred growing orientations in Al2O3 of (001) for the geometric pattern structure and of (300) for Chinese script pattern structure. Constituent phases in the MPD rod hold the orientation relationship. The yield stress for the geometric pattern structure is over 1 GPa at 1773 K, which is extremely higher than that for Chinese script pattern structure. High-temperature strength at 1773 K and 1873 K depends on strain rate and temperature in both the MPD rods.

Original languageEnglish
Pages (from-to)2697-2702
Number of pages6
JournalMaterials Transactions
Volume45
Issue number8
DOIs
Publication statusPublished - 2004 Aug

Keywords

  • AlO/YAG/ZrO eutectic composite
  • Crystallographic texture
  • Electron backscattered pattern (EBSP)
  • High-temperature strength
  • Melt-growth-composite (MGC)
  • Strength anisotropy

ASJC Scopus subject areas

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

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