TY - GEN
T1 - Fabrication and Characterization of Al2O3/GdAlO 3 Eutectic Ceramic in situ Composite by Laser Zone Remelting
AU - Su, Haijun
AU - Zhang, Jun
AU - Jiao, Sha
AU - Liu, Lin
AU - Fu, Hengzhi
PY - 2011
Y1 - 2011
N2 - 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.
AB - 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.
KW - AlO/GdAlO (GAP)
KW - Directional solidification
KW - Eutectic in situ composite
KW - Laser zone remelting
KW - Microstructure
UR - http://www.scopus.com/inward/record.url?scp=78650960721&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.160-162.773
DO - 10.4028/www.scientific.net/AMR.160-162.773
M3 - 会议稿件
AN - SCOPUS:78650960721
SN - 9780878492169
T3 - Advanced Materials Research
SP - 773
EP - 776
BT - Materials Science and Engineering Applications
T2 - 2011 International Conference on Materials Science and Engineering Applications, ICMSEA 2011
Y2 - 15 January 2011 through 16 January 2011
ER -