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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 6    December 2007

    

    

Processing, microstructure, andproperties of laser remelted Al2O3/Y3Al5O12(YAG) eutectic in situ composite
SU Hai-jun(苏海军), ZHANG Jun(张 军), LIU Lin(刘 林), FU Heng-zhi(傅恒志)

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University,Xi’an 710072, China

Abstract: Laser remelting and rapid solidification were performed in preparing the high-performance Al2O3/Y3Al5O12(YAG) eutectic in situ composite. The microstructure characteristic and solidification behavior were studied using scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), X-ray diffractometry(XRD) and simultaneous thermal analysis(STA). The hardness and fracture toughness were obtained using an indentation technique. The results show that the laser remelted Al2O3/YAG composite has a homogeneous eutectic microstructure without microcrack and pore. The component phases of Al2O3 and YAG are three-dimensionally and continuously reticular connected, and finely coupled without grain boundaries, colonies and amorphous phases between interfaces. The eutectic interspacing is greatly refined with increasing the scanning rate and average is only 1 mm. The synthetical thermal analysis indicates that the eutectic temperature of Al2O3-YAG is 1 824 ℃, well matching the phase diagram of Al2O3-Y2O3 system. The maximum hardness reaches 19.5 GPa and the room fracture toughness is 3.6 MPa∙m1/2.

 

Key words: Al2O3/Y3Al5O12(YAG); eutectic; in situ composite; laser remelting; microstructure; properties

ISSN 1672-7029
CN 43-1423/U

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