| Processing, microstructure, and properties of laser remelted Al2O3/Y3Al5O12（YAG） eutectic in situ composite |
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| 引用本文： | 苏海军,张军,刘林,傅恒志.Processing, microstructure, and properties of laser remelted Al2O3/Y3Al5O12（YAG） eutectic in situ composite[J].中国有色金属学会会刊,2007,17(6):1259-1264. |
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| 作者姓名： | 苏海军 张军 刘林 傅恒志 |
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| 作者单位： | State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi＇an 710072, China |
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| 基金项目： | 国家自然科学基金;航空基础科学基金;高等学校博士学科点专项科研项目;西北工业大学校科研和教改项目 |
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| 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.
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| 关 键 词： | Al2O3/Y3Al35O12 共晶 复合材料 激光再熔化 微观结构 |
| 收稿时间： | 15 July 2007 |
| 修稿时间： | 2007-07-15 |
Processing, microstructure, and properties of laser remelted Al2O3/Y3Al5O12(YAG) eutectic in situ composite |
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| Hai-jun SU, Jun ZHANG, Lin LIU,Heng-zhi FU.Processing, microstructure, and properties of laser remelted Al2O3/Y3Al5O12(YAG) eutectic in situ composite[J].Transactions of Nonferrous Metals Society of China,2007,17(6):1259-1264. |
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| Authors: | Hai-jun SU Jun ZHANG Lin LIU Heng-zhi FU |
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| Affiliation: | aState Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China |
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| 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 μm. The synthetically thermal analysis indicates that the eutectic temperature of Al2O3-YAG is 1 824 °C, 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.m½. |
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| Keywords: | Al2O3/Y3Al5O12(YAG) eutectic in situ composite laser remelting microstructure properties |
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