電子後方散乱回折による結晶方位差分布の測定(<小特集>結晶回折法および電子線後方散乱法による材料評価)

概要

論文の詳細を見る
It is well known stress corrosion cracking in stainless steel and nickel based alloy is enhanced by plastic strain induced in the material, although the reason why has not been fully understood. Since stress corrosion cracking begins from small crack initiation and its growth, it is important to know the inhomogeneous distribution of plastic strain. Electron backscatter diffraction (EBSD) enables us to measure crystal orientations on specimen surface with a spatial resolution of nanometer order. The magnitude of local plastic strain can be estimated from change in crystal orientation (misorientation) obtained. In this study, distributions of the misorientation were evaluated by using EBSD. A tensile specimen made of pure copper was subjected to tensile test to introduce plastic strain. From changes in surface images of the specimen during the test, distribution of plastic strain was identified by using the image correlation technique and was compared with distribution of misorientation obtained by EBSD measurement. It was revealed that the misorientation correlates well with dislocation density introduced by deformation rather than with local plastic strain. A data processing technique for improving accuracy of measured data of crystal orientation was developed and was successfully applied to obtain distributions of misorientation. The improved misorientation map showed that the misorientation tended to concentrate at grain boundaries. Influence of setting parameters in the new processing technique was investigated.
社団法人日本機械学会の論文
2008-03-25

著者

釜谷昌幸
(株)原子力安全システム研究所

電子後方散乱回折による結晶方位差分布の測定(<小特集>結晶回折法および電子線後方散乱法による材料評価)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク