激光区熔Al2O3/Er3Al5O12共晶自生复合陶瓷的组织与断裂韧性

doi:10.3724/SP.J.1077.2011.00841

无机材料学报 ›› 2011, Vol. 26 ›› Issue (8): 841-846.DOI: 10.3724/SP.J.1077.2011.00841

激光区熔Al₂O₃/Er₃Al₅O₁₂共晶自生复合陶瓷的组织与断裂韧性

邓杨芳, 张军, 苏海军, 宋衎, 刘林, 傅恒志

(西北工业大学凝固技术国家重点实验室, 西安 710072)

收稿日期:2010-10-03 修回日期:2010-11-20 出版日期:2011-08-20 网络出版日期:2011-07-14
作者简介:邓杨芳(1986-), 女, 硕士研究生. E-mail: fang_nwpu@163.com
基金资助:
国家自然科学基金(51002122, 50772090); 陕西省自然科学基金(2010JQ6005); 航空科学基金(2010ZF53064); 西北工业大学基础研究基金(G9KY1016); 西北工业大学材料学院“新人新方向”(09XE0104-5); 凝固技术国家重点实验室自主课题(76-QP-2011)

Microstructure and Fracture Toughness of Al₂O₃/Er₃Al₅O₁₂ Eutectic Ceramic Prepared by Laser Zone Remelting

DENG Yang-Fang, ZHANG Jun, SU Hai-Jun, SONG Kan, LIU Lin, FU Heng-Zhi

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

Received:2010-10-03 Revised:2010-11-20 Published:2011-08-20 Online:2011-07-14
Supported by:
National Natural Science Foundation of China (51002122, 50772090); Natural Science Foundation of Shaanxi Province (2010JQ6005); Aeronautical Science Foundation of China (2010ZF53064); NPU Foundation for Fundamental Research (NPU-FFR-G9KY1016); New People and New Directions Foundation of School of Materials Science and Engineering in NPU (09XE0104-5); Research Fund of the State Key Laboratory of Solidification Processing in NPU (76-QP-2011)

摘要/Abstract

摘要： 采用激光区熔快速定向凝固技术制备出Al₂O₃/Er₃Al₅O₁₂(EAG)共晶自生复合陶瓷, 研究了不同激光扫描速率下材料的凝固组织特征及其演变规律, 并对其力学性能和增韧机制进行了分析. 结果表明: 激光区熔Al₂O₃/EAG由连续的Al₂O₃和EAG两相组成, 两相相互交错分布, 形成均匀的三维网状结构; 共晶间距细小, 在0.2~2.1μm之间, 并随着扫描速率的增加规律性地减小. 在低的扫描速率下, 微观组织呈现典型的层片状非规则共晶组织; 当扫描速率增至800μm/s时, 出现了胞状及EAG树枝晶. 共晶陶瓷的硬度和断裂韧性分别为18.7GPa和2.45MPa·m^1/2. 微观组织高度细化以及裂纹扩展过程中沿两相界面偏转、分叉等机制提高了材料的韧性.

关键词: 氧化物共晶陶瓷, 激光区熔, 微观组织, 断裂韧性

Abstract: Directionally solidified Al₂O₃/Er₃Al₅O₁₂(EAG) eutectic ceramic was prepared by laser zone remelting technique. The eutectic morphology and microstructure evolution investigated as a function of laser scanning rate. Moreover, the mechanical properties and toughening mechanisms were studied. The Al₂O₃/EAG eutectic ceramic consists of only two continuous phases of Al₂O₃and EAG which interpenetrates with each other to form well-distributed three-dimensional network. The eutectic spacing is only around 0.2-2.1μm and reduces with the increase of scanning rate. At low scanning rate, the typical lamellar irregular eutectic structure is obtained. When the scanning rate reaches 800μm/s, the cellular or dendrite microstructure appears. The hardness and the fracture toughness at room temperature are measured to be 18.7GPa and 2.45MPa·m^1/2, respectively. The refined microstructure, crack deflection at phase interface and crack branching contribute to the improved toughness.

Key words: oxide eutectic ceramic, laser zone remelting, microstructure, fracture toughness

中图分类号:

TB332

邓杨芳, 张军, 苏海军, 宋衎, 刘林, 傅恒志. 激光区熔Al₂O₃/Er₃Al₅O₁₂共晶自生复合陶瓷的组织与断裂韧性[J]. 无机材料学报, 2011, 26(8): 841-846.

DENG Yang-Fang, ZHANG Jun, SU Hai-Jun, SONG Kan, LIU Lin, FU Heng-Zhi. Microstructure and Fracture Toughness of Al₂O₃/Er₃Al₅O₁₂ Eutectic Ceramic Prepared by Laser Zone Remelting[J]. Journal of Inorganic Materials, 2011, 26(8): 841-846.

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激光区熔Al₂O₃/Er₃Al₅O₁₂共晶自生复合陶瓷的组织与断裂韧性

Microstructure and Fracture Toughness of Al₂O₃/Er₃Al₅O₁₂ Eutectic Ceramic Prepared by Laser Zone Remelting

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