Al_2O_3/(纳米)Fe_3Al复合材料位错形貌的TEM观测  

TEM OBSERVATION ON THE DISLOCATION MORPHOLOGY OF Al_2O_3 / (NANO)Fe_3Al COMPOSITE

作　　者：尹衍升 龚红宇[2] 谭训彦[2] 甄玉花[2] 张银燕[2] 陈云[2] 

机构地区：[1]中国海洋大学材料科学研究院,青岛266003 [2]山东大学材料液态结构与遗传性教育部重点实验室工程陶瓷山东省重点实验室,济南250061

出　　处：《复合材料学报》2004年第2期153-156,共4页Acta Materiae Compositae Sinica

基　　金：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)

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。Extensive dislocation structure was observed by TEM in the Fe3Al/Al2O3 nanocomposite. The composites were strengthened due to microstructure refinement through sub-grain 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 Al3O3, 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.

关 键 词：位错 Fe3Al/Al2O3 复合材料 

分 类 号：TQ174[化学工程—陶瓷工业]