作　　者： ; ; ; ; ; ;

机构地区： 河南科技大学材料科学与工程学院

出　　处： 《热处理》 2007年第1期29-33,共5页

摘　　要： 利用透射电镜(TEM)研究了钢表面热浸渗铝层的微观组织,结果表明,热浸渗层组织中出现大量调幅组织,调幅结构形成后,调幅组织经过长大,其波长由表面向内部从3 nm逐渐增大到30 nm。从渗层内部到表面,调幅组织形貌从网格状向平行交叉条状直到平行直线状过渡,部分区域调幅分解条纹平行于晶界呈环状。晶界对调幅分解的形貌产生明显的影响。通过计算Fe、A l原子尺寸因子,对调幅分解形貌的变化进行了分析。 The microstructure of coating hot-dipped with aluminum were analyzed by transmission electron microscopy （TEM）. The results show that there are a lot of spinodal structures in the coating. After the spinodal decomposition structure formed the wavelengths of spinodal decomposition gradually augmented from 3 nm to 30 nm from surface to inner of the coating. From inside to outside of the coating the pattern of spinodal decomposition structure changed from lattice shape to parallel across striation and to parallel beeline. The spinodal decomposition stripes paralleling to grain boundaries appears as circularity in some areas. The grain boundaries obviously affect pattern of the spinodal decomposition microstructure. The change of spinodal decomposition microstructure morphology was analyzed through calculating size fractor of iron and aluminium atoms.

关 键 词： 热浸镀 调幅分解 晶界 透射电子显微镜

领　　域： [金属学及工艺] [金属学及工艺]