Processing, microstructure, and properties of laser remelted Al2O3/Y3Al5O12(YAG) eutectic in situ composite

摘要：

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 μm.The synthetically thermal analysis indicates that the eutectic temperature of Al2O3-YAG is 1 824 ,well match ℃ ing 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.

关键词： Al2O3/Y3Al5O12(YAG) eutectic in situ composite laser remelting microstructure properties

作者: SU Hai-jun ZHANG Jun LIU Lin FU Heng-zhi

作者单位: State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）