Microstructure of Al2O3/ZrO2 eutectic fibers grown by the micro-pulling down method

Jong Ho Lee, Akira Yoshikawa, Stephen D. Durbin, Dae Ho Yoon, Tsuguo Fukuda, Yoshiharu Waku

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78 Citations (Scopus)

Abstract

The micro-pulling down method has been applied to grow Al2O3/ZrO2 eutectic fibers and to investigate their microstructural properties as a function of solidification rate. Al2O3/ZrO2 eutectic fibers 0.2 to approximately 2 mm in diameter and 500 mm in length have been grown with a pulling rate of 0.1 to approximately 15 mm/min. The eutectic microstructures changed as a function of pulling rate from rod shape to cellular shape containing some thin lamellae. Typical lamellar thickness decreased from about 380 to 110 nm as the pulling rate increased from 1 to 15 mm/min. The interlamellar spacing, λ fits the inverse-square-root dependence on the pulling rate, ν according to λ = 1×ν-1/2, where λ has the dimension of μm and ν is in μ/s. Hardness value reached 13.1 GPa for fibers grown at a pulling rate of 15 mm/min and tensile strength of 900 MPa was achieved at a pulling rate of 10 mm/min. The hardness also increased as the interlamellar spacing decreased.

Original languageEnglish
Pages (from-to)791-796
Number of pages6
JournalJournal of Crystal Growth
Volume222
Issue number4
DOIs
Publication statusPublished - 2001 Feb

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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