纯铁表面机械研磨组织中的特殊扩散行为研究  

Abnormal diffusion behavior in pure iron subjected to surface mechanical attrition treatment

作　　者：罗宇峰[1] 蒋益明[1] 钟澄[1] 邓博[1] 李劲[1] 

机构地区：[1]复旦大学材料科学系,上海200433

出　　处：《金属热处理》2008年第3期55-58,共4页Heat Treatment of Metals

基　　金：国家自然科学基金(50571027;50701010);上海市重点学科项目(B113);国家科技部专项(2005DKA10400)

摘　　要：选取纯铁为研究对象在其表面进行机械研磨处理(SMAT),利用研磨处理后试样表面具有的大量晶界在低温下进行Al元素的扩渗。对扩渗处理前后的试样表面采用扫描电子显微镜(SEM)进行金相组织观察,采用X射线衍射(XRD)进行微观组织结构分析,并进行中低温氧化动力学规律的表征。结果表明,研磨处理可以使纯铁表面组织纳米化,从而实现低温下Al元素的有效渗入,使纯铁的抗氧化性能显著提高。Surface mechanical attrition treatment （SMAT） was introduced to realize surface nanocrystallization on a pure Fe sample. Al-diffusion treatment was performed at low temperature by using large amount of grain boundaries on the surface of the sample pure Fe after SMAT. Samples before and after Al-diffusion were comparatively studied and contrasted by means of SEM, XRD and characterized by oxidation kinetics rule. The results show that the pure Fe plate realized surface nanocrystallization after SMAT, thus Al element was able to diffuse effectively at a low temperature,leading to a remarkable enhance of the oxidation-proof ability of the pure Fe.

关 键 词：纯铁 表面机械研磨 扩散 

分 类 号：TG178[金属学及工艺—金属表面处理] TG156.8[金属学及工艺—金属学]