Fabrication and Characterization of Al2O3/GdAlO 3 Eutectic Ceramic in situ Composite by Laser Zone Remelting

Haijun Su, Jun Zhang, Sha Jiao, Lin Liu, Hengzhi Fu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

In situ composite of Al2O3/GdAlO3 (GAP) ceramic eutectic prepared by directional solidification is an interesting candidate for the manufacture of turbine blades because of its excellent mechanical properties. In the present paper, directionally solidified Al 2O3/GAP eutectic in situ composite ceramics are manufactured by the laser zone remelting technique to investigate the rapid solidification process. The laser power and scanning rate necessary to carry out the ceramic melt growth is determined. The characteristic microstructure is investigated by scanning electron microscopy (SEM), energy disperse spectroscopy (EDS) and X-ray diffraction (XRD). The as-solidified Al2O 3/GAP eutectic presents an elongated colony structure consisting of only α-Al2O3 and GAP phases with an oriented growth array. The eutectic spacing is strongly dependent on the laser scanning rate, rapidly decreasing to the sub-micron range for the samples grown at the highest rate. Besides, the formation condition and evolution of the particular microstructure of the composite during rapid solidification are discussed.

Original languageEnglish
Title of host publicationMaterials Science and Engineering Applications
Pages773-776
Number of pages4
DOIs
StatePublished - 2011
Event2011 International Conference on Materials Science and Engineering Applications, ICMSEA 2011 - Xi'an, China
Duration: 15 Jan 201116 Jan 2011

Publication series

NameAdvanced Materials Research
Volume160-162
ISSN (Print)1022-6680

Conference

Conference2011 International Conference on Materials Science and Engineering Applications, ICMSEA 2011
Country/TerritoryChina
CityXi'an
Period15/01/1116/01/11

Keywords

  • AlO/GdAlO (GAP)
  • Directional solidification
  • Eutectic in situ composite
  • Laser zone remelting
  • Microstructure

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