FRACTURE BEHAVIOR OF LASER ZONE-REMELTED METASTABLE EUTECTIC AL2O3/YAG/ZRO2 IN-SITU COMPOSITE

摘要：

The microstructural features and fracture behavior of metastable eutectic Al2O3/YAG/ZrO2 insitu composites grown by laser zone-remelting technique are studied. The microstructures of the composites are investigated using SEM, EDS and XRD. Fracture toughness and crack propagation behavior of the composites are examined using the Vickers indentation technique. The metastable eutectic consists of Al2O3, YAG and ZrO2 phases, showing a typically refined irregular lamellar eutectic structure with eutectic spacing as fine as 0.5μm. The fracture toughness of the metastable eutectic Al2O3/YAG/ZrO2 is 3.9±1.0 MPa.m1/2. The addition of ZrO2, crack deflection and microcrack toughening are the predominant toughening mechanisms.

作者: Haijun Su Jun Zhang Lin Liu Hengzhi Fu

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

会议类型: 国际会议

会议名称: 第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)

会议地点: 北京

会议语种:英文

在线出版日期: 2007-10-15（万方平台首次上网日期，不代表论文的发表时间）