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金属学报  1998, Vol. 34 Issue (12): 1249-1254    
  论文 本期目录 | 过刊浏览 |
锯齿状魏氏组织表面浮凸的扫描隧道显微镜研究
薄祥正;徐宁;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;清华大学材料科学与工程系;北京;100084
STM STUDY ON THE SURFACE RELIEF EFFECTS ASSOCIATED WITH WIDMANSTAT SAWTEETH
BO Xiangzheng; XU Ning; FANG Hongsheng(Department of Materials Science and Engineering; Tsinghua University; Beijing 100084)Correspondent: BO Xiangzheng; Tel: (010)62782361; Fax: (010)62771160;E-mail. As -dms @m ailTsinghua. edu. cnManuscript received 1997-12-29; in revised form 1998-03-23
引用本文:

薄祥正;徐宁;方鸿生. 锯齿状魏氏组织表面浮凸的扫描隧道显微镜研究[J]. 金属学报, 1998, 34(12): 1249-1254.
, , . STM STUDY ON THE SURFACE RELIEF EFFECTS ASSOCIATED WITH WIDMANSTAT SAWTEETH[J]. Acta Metall Sin, 1998, 34(12): 1249-1254.

全文: PDF(2374 KB)  
摘要: 用扫描隧道显微镜观察到Fe—0.37C(质量分数,%)钢中的锯齿状魏氏组织产生表面浮凸,发现其浮凸是由多片魏氏组织片条组成的浮凸群,浮凸高度约为60—170nm,低于其形核处仿晶型铁素体的表面浮凸。在仿晶型铁素体中观察到面-面激发形核方式,其浮凸的最大形状变形量为0.39.锯齿状魏氏组织和仿晶型铁素体的表面浮凸可用台阶机制解释,并以台阶机制定性解释了帐篷型、复杂型和单倾型表面浮凸的形成过程.
关键词 锯齿状魏氏组织仿晶型铁素体表面浮凸扫描隧道显微镜台阶生长    
Abstract:Surface relief effects associated with the widmanstatten sawteeth in an Fe-0.37C(mass fraction,%) alloy were investigated by scanning tunneling microscopy (STM) for the firsttake. the relief of the widmanstatten sawteeth is made up of a group of platelets. The height ofthe relief is about 61-171 urn, which is lower than that of grain boundary allotriomorph fromwhich sawteeth devoloped. Configuration of face-to-face sympathetic nucleation was observed ingrain boundary allotriomorphs, and the maximum shape deformation of their reliefs is 0.39. Theformation of surface relief caused by sawteeth and allotriomorphs precipitation can be rationallyexplained by the ledgewise growth mechanism. Ledgewise groWth mechanlism is applied to explainqualitatively the formation of a tent-shaped, complex-shaped and single-tilt surface relief.
Key wordswidmanstatten sawteeth    grain boundary alotriomorph    surface relief    scanning tunneling microscopy    ledgewise growth
    
基金资助:国家自然科学基金!59771036
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