Investigation of Solid State Reaction by Means of Direct Observation of Atomistic Structural Changes

通过直接观察原子结构变化研究固态反应

• 批准号: 10305046
• 负责人: KIRITANI Michio
• 金额: $ 26.75万
• 依托单位: Hiroshima Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10305046/
• 关键词: Lattice Defect; Point Defect; Dislocation; Radiation Damage; Plastic Deformation; High-Speed Deformation; Ductile Fracture; Electron Microscopy; 転位構造; 無秩序反応

The most superior method of direct observation of defect reactions is to utilize high energy electron irradiation in a high-voltage electron microscope : (a) A systematic investigation has been performed on the effect of solute addition to defect structure evolution, (b) A method of the identification of the nature of small point defect clusters in neutron irradiated materials was established by superimposing electron irradiation and applied to representative materials, (c) Effect of strain field around dislocation on cascade defects was elucidated, (d) Detection of stochastic fluctuation of point defect reaction processes was successfully made during the growth of electron irradiation-induced dislocation loops, (e) Measurement of short relaxation phenomena was made by newly designed intermittent irradiation technique. As for the defect microstructures induced by high energy neutron irradiation : (f) The role of electron microscopically invisible small defect clusters in iron was eluci … More dated, (g) Relation between the destination of cascade collision induced point defects and the microstructure evolution was studied, (h) Effect of solute elements to the defect microstructure evolution was systematically investigated, (i) The mechanism of defect reaction during neutron irradiation with temperature variation was also studied. Plastic deformation of crystalline metals without dislocation was the most important and new subject in this research project : (j) Absence of the operation of dislocations was confirmed by direct observation of the progress of deformation in an electron microscope, (k) From the dynamic observation of the appearance and disappearance of point defect clusters, point defects are concluded to be introduced as dispersed point defects, but not as point defect clusters, (l) Local strain was successfully measured by the deformation of plastically deformable precipitates, (m) Deformation mode was examined by using samples containing various kinds of secondary defects, (n) all of these experimental results lead to the proposal of a new mechanism of deformation with glide elements which replace dislocations, under the condition of extremely high internal stress. Investigation of high-speed deformation achieved the strain rate of 10^7/s, and (o) Defect structures were found to change drastically by the deformation with strain rate over 10^5/s. Less

直接观察缺陷反应的最上级方法是利用高压电子显微镜中的高能电子照射：（a）对溶质添加对缺陷结构演化的影响进行了系统的研究，（B）建立了一种用叠加电子辐照鉴别中子辐照材料中小点缺陷团性质的方法，（c）阐明了位错周围应变场对级联缺陷的影响;（d）成功地检测了电子辐照诱导位错环生长过程中点缺陷反应过程的随机涨落;（e）采用新设计的间歇辐照技术测量了短弛豫现象。对于高能中子辐照产生的缺陷微结构：（f）阐明了电子显微镜下不可见的小缺陷团簇在铁中的作用， ...更多信息 （g）研究了级联碰撞诱发点缺陷的终点与微结构演化的关系;（h）系统地研究了溶质元素对缺陷微结构演化的影响;（i）研究了中子辐照过程中缺陷随温度变化的反应机理。无位错晶体金属的塑性变形是本研究项目中最重要和最新的课题：（j）通过在电子显微镜中直接观察变形的进程，确认没有位错的作用。（k）根据点缺陷簇的出现和消失的动态观察，点缺陷被认为是作为分散的点缺陷引入的，而不是作为点缺陷簇，（l）通过塑性变形沉淀物的变形成功地测量了局部应变，（m）通过使用含有各种次级缺陷的样品来检查变形模式，（n）所有这些实验结果导致提出了用滑移元素代替位错的新的变形机制，在极高内应力的条件下，高速变形的研究达到了10^7/s的应变速率，并且（o）发现在应变速率超过10^5/s的变形下，缺陷结构急剧变化。少

项目成果

T.Yoshiie and M.Kiritani: "Destination of point defects and microstructural evolution under collision cascade damage"Journal of Nuclear Materials. 271&272. 296-300 (1999)

T.Yoshiie 和 M.Kiritani：“碰撞级联损伤下点缺陷的目的地和微观结构演化”核材料杂志。

T.Yoshiie and M.Kiritani: "Destination of point defects and microstructural evolution under collision cascade damage"Journal of Nuclear Materials. Vol.271&272. 296-300 (1999)

T.Yoshiie 和 M.Kiritani：“碰撞级联损伤下点缺陷的目的地和微观结构演化”核材料杂志。

M.Kiritani,Y.Satoh,Y.Kizuka,K.Arakawa,Y.Ogasawara,et.al.: "Anomalous production of vacancy clusters and the possibility of plastic deformation of crystalline metals without dislocations"Philosophical Magazine Letters. Vol.79. 797-804 (1999)

M.Kiritani,Y.Satoh,Y.Kizuka,K.Arakawa,Y.Ogasawara,et.al.：“空位簇的异常产生和无位错晶体金属塑性变形的可能性”哲学杂志快报。

M.Horiki,T.Yoshiie,M.Iseki,and M.Kiritani: "Invisible and visible point defect clusters in neutron irradiated iron"Journal of Nuclear Materials. 271&272. 256-260 (1999)

M.Horiki、T.Yoshiie、M.Iseki 和 M.Kiritani：“中子辐照铁中的不可见和可见点缺陷簇”核材料杂志。

K.Arakawa, K.Ono, M.Iseki and M.Kiritani: "Elongation fracture of metals containing pre-introduced secondary defects"Radiation Effects and Defects in Solids. (in press). (2001)

K.Arakawa、K.Ono、M.Iseki 和 M.Kiritani：“含有预先引入的二次缺陷的金属的伸长断裂”固体中的辐射效应和缺陷。