Wide-Area Observation of Dislocation Structures around Fatigue Crack using ECCI Method

使用 ECCI 方法大范围观察疲劳裂纹周围的位错结构

基本信息

批准号：
17360344
负责人：
HASHIMOTO Satoshi
金额：
$ 9.92万
依托单位：
Osaka City University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360344/
关键词：
ECCI method fatigue crack propagation dislocation persistent slip band copper stainless steel scanning electron microscopy 金属疲労転位構造フェライト系ステンレス鋼単結晶

项目摘要

Dislocation structures formed near fatigue cracks in copper single crystals and ferritic stainless steels were observed with electron channelling contrast imaging (ECCI) method. The ECCI method is based on the electron channelling phenomenon that intensity of backscattered electrons depends on the angle between incident electron beam and lattice plane. We can observe dislocations lying under surface in a scanning electron microscope (SEM). In the present research, it was confirmed that the dislocation structures such as the persistent slip band (PSB) and the labyrinth structure -- which are generated due to fatigue loading -- were imaged with the ECCI method over a wide area including the crack tip vicinity, at which the TEM observation had been difficult. At the fatigue experiments on the copper single crystals, the dislocation structures formed around fatigue cracks were sensitive to loading axes. At the [001] loading axes, the ladder-like PSB structure and the labyrinth structure we … More re observed around the fatigue crack. The formation of these dislocation structures depended on the angle from crack plane. The distribution of the dislocation structures could be explained by the stress distribution calculated from the linear fracture mechanics. In the crack growth experiments on Fe-30%Cr single crystals, the dislocation structures depended on the mode of fatigue cracks. The cell structure surrounded the fatigue crack having Mode-III component which appeared at <112> and <221> loading axes. On the other hand, no significant dislocation structures were found near the Mode-II fatigue crack propagating at the specimen with <110> loading axis. Only a band-like dislocation structure parallel to the crack plane was emitted from the crack tip. In the polycrystalline Fe-20%Cr alloy, the relationship between crack growth rate and the surrounding dislocation structure was investigated. At a single-slip-oriented grain, the dislocation structure mostly observed in the vicinity of the crack was the vein and the crack growth rate was relatively fast. On the other hand, the cell structure was well developed near the crack in double-slip oriented grains. The fatigue crack with the cell structure propagated at slow crack growth rate. Less

铜单晶体中的疲劳裂纹，使用电子通道ging（ECCI）方法观察到铁素体钢，基于电子通道现象，即反向散射电子的强度取决于n n n n n of thegle n Intron n Intron beam和lattice平面。在扫描电子显微镜（SEM）中。在铜单晶上进行的疲劳实验，在[001]阶梯状结构和迷宫结构上形成的疲劳裂纹是对这些疲劳的疲劳裂纹的。结构取决于裂纹平面的角度。模式-III分量出现在<221>的轴上，另一方面，没有明显的脱位结构，即II疲劳架在样品上传播<110> <110>。裂纹平面是从裂纹尖端发出的，周围的脱位结构在单滑的谷物上进行了研究双向晶粒，疲劳裂纹以较慢的裂纹生长速度传播

项目成果

期刊论文数量（0）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Fatigue limit and crack growth in ultra-fine grain metals produced by severe plastic deformation

DOI：
10.1007/s10853-006-0973-z
发表时间：
2007-03
期刊：
Journal of Materials Science
影响因子：
4.5
作者：
A. Vinogradov
通讯作者：
A. Vinogradov

Monotonic and Cyclic Bahaviour of Ultrafine Grain Metals : Overview

超细晶粒金属的单调和循环行为：概述

DOI：
发表时间：
2006
期刊：
Mater. Sci. Forum 503-504
影响因子：
0
作者：
Y.Ohno;Y.Kaneko;S.Hashimoto;A.Vinogradov;A.Vinogradov
通讯作者：
A.Vinogradov

ECC Observations of Nanostructures Formed by Sliding Wear in Copper

铜滑动磨损形成的纳米结构的 ECC 观察

DOI：
发表时间：
2006
期刊：
Mater. Sci. Forum 503-504
影响因子：
0
作者：
Y.Ohno;Y.Kaneko;S.Hashimoto
通讯作者：
S.Hashimoto

Correlation between Acoustic Emission and Internal Friction in Materials

材料中声发射与内摩擦之间的相关性

DOI：
发表时间：
2006
期刊：
Advanced Mater. Res. 13-14
影响因子：
0
作者：
Y.Ohno;Y.Kaneko;S.Hashimoto;A.Vinogradov
通讯作者：
A.Vinogradov

Discrete Dislocation Dynamics Simulation on Strengths of Dislocation Network Stacks in Multilayered Structures

多层结构中位错网络堆叠强度的离散位错动力学模拟

DOI：
发表时间：
2007
期刊：
Key Eng. Mater. (印刷中)
影响因子：
0
作者：
Y.Kaneko;S.Hirota;S.Hashimoto
通讯作者：
S.Hashimoto

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HASHIMOTO Satoshi其他文献

Measurements of Neutrons from Photonuclear Reactions Using Laser Compton Scattering Gamma Rays

使用激光康普顿散射伽马射线测量光核反应中的中子

DOI：
10.1585/pfr.13.2404066
发表时间：
2018
期刊：
Plasma and Fusion Research
影响因子：
0.8
作者：
MIYAMOTO Shuji;TAKEMOTO Akinori;YAMAGUCHI Masashi;SUGITA Kento;HASHIMOTO Satoshi;AMANO Sho
通讯作者：
AMANO Sho