仿晶型铁素体表面浮凸的扫描隧道显微镜研究

金属学报

1998, Vol. 34

Issue (8): 807-812

论文

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仿晶型铁素体表面浮凸的扫描隧道显微镜研究

薄祥正;方鸿生

清华大学材料科学与工程系;北京;100084;清华大学材料科学与工程系;北京;100084

STUDY OF THE SURFACE RELIEF EFFECTS ASSOCIATED WITH GRAIN BOUNDARY ALLOTRIOMORPHS BY SCANNING TUNNELING MICROSCOPY

BO Xiangzheng; FANG Hongsheng( Departmetn of Materials Science and Engineering; Tsinghua University; Beijing; 100084)Correspondent: BO Xiangzheng; Tel: (010)62782361; E-mail: fhs - dms tsinghua. edu. cn.

引用本文:

薄祥正;方鸿生. 仿晶型铁素体表面浮凸的扫描隧道显微镜研究[J]. 金属学报, 1998, 34(8): 807-812.
, . STUDY OF THE SURFACE RELIEF EFFECTS ASSOCIATED WITH GRAIN BOUNDARY ALLOTRIOMORPHS BY SCANNING TUNNELING MICROSCOPY[J]. Acta Metall Sin, 1998, 34(8): 807-812.

全文: PDF(2699 KB)

摘要: 用扫描隧道显微镜观察研究了Fe－0．37℃（质量分数，％）钢中仿晶型铁素体（GBA）的表面浮凸，发现GBA确实产生了表面浮凸，浮凸只是由GBA本身引起的，而不是由GBA和它在基体中的塑性变形共同引起的．GBA表面浮凸只在晶界一侧的奥氏体晶粒形成，与此相邻的奥氏体晶粒内未观察到与组织相对应的表面浮凸．说明GSA与奥氏体的界面是共格或半共格的，而与相邻奥氏体的界面可能是非共格的．GBA的浮凸高度为157—352nm，最大形状变形量为0．37．GBA宽面上存在着巨型台阶，台阶的高度约为300nm．边一边激发形核形态在GBA中普遍存在所有这些说明GBA是以激发形核一台阶生长机制形成的

关键词 ：仿晶型铁素体, 扫描隧道显微镜, 表面浮凸, 共格, 激发形核, 台阶生长

Abstract：In this paper, surface relief effects associated with grain boundary allotriomorph (GBA) in an Fe-0.37C (mass fraction,%) steel were investigated by scanning tunneling microscopy (STM) for the first time. It was discovered that GBA does produce surface reliefs. The surface reliefs originate only from the GBA, not from both the GBA and its slip accommodation which took place in the matrix. The GBA which exhibits the surface relief is only developed into one austenite grain, and the GBA in adjacent austenite does not produce surface relief effects. This means that the GBA/austenite interface is coherent or partially coherent, but the interface between the GBA and the adjacent austenite may be incoherent. The height of surfaCe reliefs is 157-352 nm, and the maximum shape deformation is 0.37. On the broad face of the GBA exist super ledges, whose height is 300 um. The configuration of edge-to- edge sympathetic nucleation is commonly observed in GBAs. All the experimental results indicate that GBA is formed by a sympathetic nucleation-ledgewise growth mechanism.

Key words： GBA STM surface relief coherent sympathetic nucleation ledgewise growth

收稿日期: 1998-08-18

基金资助:国家自然科学基金!59771036

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