纯铁经表面机械研磨处理后微结构参量的表征
Characterization of Microstructural Parameters of Pure Iron after Surface Mechanical Attrition Treatment
摘 要
用X射线线形分析法(XLPA)测定了经表面机械研磨处理(SMAT)后纯铁的有效晶粒(亚晶)尺寸、微观应变、位错密度和体弹性储能密度,用TEM观察了组织形貌,并与40%拉伸试样进行了对比.结果表明:纯铁经SMAT 90 min后,平均位错密度高达1.0×1016 m-2,表面亚晶粒尺寸在7 nm左右;相对拉伸而言,SMAT对晶粒细化和引入微观应变的效果十分明显;XLPA法与TEM法得到的晶粒尺寸基本一致.
纳米晶纯铁
X射线线形分析
微观结构
surface mechanical attrition treatment
nanocrystalline pure iron
X-ray line profile analysis
microstructural feature
Abstract
The microstructural features of pure iron after surface mechanical attrition treatment(SMAT),such as effective grain (subgrain) size,micro-distortion,dislocation density and elastic stored energy density,were determined by the X-ray line profile analysis(XLPA).The microstructure was observed by SEM and compared to tensile samples with 40% deformation.The results indicate that for pure iron sample prepared by SMAT for 90 min the average dislocation density was 1.0×1016 m-2 and the effective grain size was about 7 nm,which produced the most effective grain refinement and the greatest micro-distortion compared with the tensile sample.The grain sizes determined by XLPA and TEM methods were very close.
中图分类号 TG146.1
所属栏目 试验研究
基金项目 上海市科技发展基金资助项目(0210nm017)
收稿日期 2007/12/26
修改稿日期 2008/5/6
网络出版日期
作者单位点击查看
备注许为宗(1984-),男,上海人,硕士研究生.
引用该论文: XU Wei-zong,LI Wei,RONG Yong-hua. Characterization of Microstructural Parameters of Pure Iron after Surface Mechanical Attrition Treatment[J]. Materials for mechancial engineering, 2009, 33(1): 1～4
许为宗,李伟,戎咏华. 纯铁经表面机械研磨处理后微结构参量的表征[J]. 机械工程材料, 2009, 33(1): 1～4
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