OS1426-228 SEM/EBSD法でのキクチ図形解析による疲労転位構造の可視化

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  • OS1426-228 Visualization of Fatigued Dislocation Structures by Analyzing Kikuchi Patterns in SEM/EBSD Method

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Surface of a fatigued copper was analyzed by the EBSD technique, to consider a possibility that self-organized dislocation structure is visualized through Kikuchi pattern analysis. In this study, the single-slip oriented copper single crystal was cyclically deformed under a constant plastic shear strain amplitude of 10^<-3> for 10^4 cycles. After the fatigue test, the specimen surface was observed with the ECCI and the EBSD method, equipped with an FE-SEM. The ECCI observation revealed that the vein and ladder-like PSB structure were generated. Because these dislocations cause local lattice distortion, a Kikuchi pattern measured by the EBSD can be modified slightly. In this study, morphology of a Kikuchi band was evaluated by analyzing Hough-transformed image of the Kikuchi pattern. The quantified positions of a target intensity peak corresponding to a Kikuchi band were plotted in a plane for all the Hough images measured. It is found that the plotted picture was similar to the dislocation structure of the ECC image.

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