Microstructure and fracture toughness of directionally solidified Al2O3/Y3 Al5O12(YAG) eutectic by laser zone melting

Hai Jun Su, Jun Zhang, Lin Liu, Heng Zhi Fu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Al2O3/Y3 Al5O12(YAG) eutectic ceramic was prepared from melt by laser-zone-melting with directional solidification technique to study the relationship between the eutectic microstructure and the processing parameters, and its mechanical property was investigated as well. The analysis results show that the scanning rate and power density strongly affect the eutectic microstructure. With the processing parameters adjusted properly, the binary Al2O3/YAG has a uniform and homogeneous lamella microstructure, in which single-crystal Al2O3and single-crystal YAG are three-dimensionally and continuously reticularly connected and finely coupled without grain boundaries, colonies and amorphous phases between interfaces. Eutectic spacing is only around 1-2 μm and is diminished with the scanning rate' s increasing. The maximum hardness reaches 19.5 GPa and the fracture toughness at room temperature is attained for 3.6 MPa·m1/2 by Vickers indentation method.

Original languageEnglish
Pages (from-to)741-745
Number of pages5
JournalCailiao Kexue yu Gongyi/Material Science and Technology
Volume15
Issue number6
StatePublished - Dec 2007

Keywords

  • AlO/Y AlO(YAG)
  • Eutectic ceramic in-situ composite
  • Laser zone melting

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