中文摘要：

激光 remelting 和快速的团结在准备高效的 Al2O3/Y3Al5O12 (钇铝柘榴石) 被执行在 situ 最容易溶解合成。微观结构特征和团结行为用扫描电子显微镜学(SEM ) 被学习，精力散光谱学(版本) ， X 光检查 diffractometry (XRD ) 和同时的热分析(STA ) 。坚硬和破裂坚韧用一种缩进技术被获得。结果证明激光 remelted Al2O3/YAG 合成没有 microcrack 和毛孔，有同类的最容易溶解的微观结构。Al2O3 和钇铝柘榴石的部件阶段三在尺寸上、连续地网状没有在接口之间的谷物边界，殖民地和非结晶的阶段，连接了，并且细微地联合了。最容易溶解的 interspacing 极大地与增加扫描的率被精制，一般水准仅仅是 1 m。综合地热的分析显示 Al2O3 钇铝柘榴石的最容易溶解的温度是 1 824

英文摘要：

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 l μm. The synthetically 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.m^1/2.