1250℃烧结Fe-28Al-5Cr(at.%)合金结构的透射电子显微学表征  

TEM characterization of the microstructures of Fe-28Al-5Cr(at.%) alloy sintered at 1250℃

作　　者：张可翔[1,2,3] 贺连龙[1,2] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,辽宁沈阳110016 [2]中南大学轻质高强结构材料国家重点实验室,湖南长沙410012 [3]中国科学院大学,北京100049

出　　处：《电子显微学报》2016年第4期309-313,共5页Journal of Chinese Electron Microscopy Society

基　　金：国家重点基础研究发展计划973计划(No.2011CB605803)

摘　　要：利用透射电子显微镜(TEM)研究了一种在1 250℃下热压烧结的Fe-28Al-5Cr(at.%)合金的显微结构。研究结果表明:基体由DO3型有序相Fe3Al组成,Cr以固溶方式存在于基体中。α-Al2O3主要沿Fe3Al晶界析出,晶内也有少量分布。这些α-Al2O3析出相颗粒表面通常会形成尖晶石结构的Fe Al2O4包裹层。同时发现基体三叉晶界处有孔洞的形成,且孔洞中松散填充着α-Al2O3颗粒。在Fe3Al晶内存在着a/2<110>刃型全位错。The microstructures of a Fe-28Al-5Cr （ at.%） alloy sintered at 1 250 ℃ was studied by transmission electron microscopy （ TEM） . The result shows that the main phase is DO3 type Fe3 Al phase and the element Cr acts as solute atom in the Fe3 Al grains. There are someα-Al2 O3 precipitations and most of them exist at the Fe3 Al grain boundaries. It is interesting that theseα-Al2 O3 are capsulated by a FeAl2 O4 layer, which is a typical spinel structure. Besides, some micropores were formed at the triple junction of grains, and these micropores were filled with α-Al2 O3 particles incompactly. The typical a/2 〈110〉 edge dislocations existed in the matrix Fe3 Al grains.

关 键 词：Fe-Al-Cr合金 晶界析出 氧化 位错 

分 类 号：TF125[冶金工程—粉末冶金]