Al2O3/(纳米)Fe3Al复合材料位错形貌的TEM观测

Al₂O₃/(纳米)Fe₃Al复合材料位错形貌的TEM观测

基金项目: 国家自然科学基金资助项目(编号:50242008);教育部博士点基金资助项目(编号:20020422001)

详细信息

1.
Department of Materials, Ocean University of China, Qingdao 266003, China;
2.
Key Laboratory for Liquid Structure and Hereditry of Ministry of Education, Shandong University, Engineering Ceramics Key Laboratory of Shandong Province, Jinan 250061,China

摘要

摘要: 利用TEM对Fe₃Al/Al₂O₃复合材料的位错形貌进行了观测分析,观察到Fe₃Al/Al₂O₃中丰富的位错组态。根据透射电镜观察,引入Fe₃Al后,Al₂O₃晶内产生大量位错,位错多产生于Fe₃Al于Al₂O₃相界面附近,亚界面的形成使基体晶粒再细化,使强度提高。在Fe₃Al中观察到超点阵位错,对材料起到"有序强化"作用。
- 位错 /
- Fe₃Al/Al₂O₃ /
- 复合材料
Abstract: Extensive dislocation structure was observed by TEM in the Fe₃Al/Al₂O₃ nanocomposite. The composites were thus strengthened due to microstructure refinement through subgrain formation. The ordered strengthening mechanism of Fe₃Al intermetallic further increased the mechanical properties of Fe₃Al/Al₂O₃ composites. It was seen from TEM that lots of dislocations were produced in Al₂O₃ intergrains by introducing Fe₃Al. The dislocations mainly existed near the interphase of Fe₃Al and Al₂O. TEM shows Fe₃Al can breed rich dislocations in Al₂O₃, which were nailed by nano grains. The composites were strengthened due to microstructure refinement through subgrain formation. Superlattice dislocations observed in Fe₃Al can produce orderly strengthening.
- dislocation /
- Fe₃Al/Al₂O₃ /
- composite