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首页> 外文会议>Riso international symposium on materials science >THREE-DIMENSIONAL EVALUATION OF DISLOCATION ARRANGEMENTS USING ELECTRON TOMOGRAPHY IN AUSTENITIC STEEL
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THREE-DIMENSIONAL EVALUATION OF DISLOCATION ARRANGEMENTS USING ELECTRON TOMOGRAPHY IN AUSTENITIC STEEL

机译：奥氏体钢上电子断层扫描脱位布置的三维评价

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摘要

In order to comprehend three-dimensional (3D) dislocation arrangements in deformed austenitic steels, we firstly investigated appropriate imaging conditions for electron tomography with scanning transmission electron microscopy (STEM). Dislocation contrast is clearly observed in a bright-field (BF) STEM images due to lowering of dynamical diffraction contrast, such as thickness fringes and bend contours. The high dislocation contrast was maintained at a high specimen-tilt angle. Next, we attempted a 3D reconstruction using two BF-STEM tilt-series to avoid extinction of the dislocation lines. In the resultant 3D microstructure, the dislocation arrangements were clearly observed at an arbitrary orientation. The length and density of dislocations in the whole reconstructed space are 907 μm and 3.8×l0~(13) m~(-2), respectively. In addition, it was demonstrated that the dislocation density gradually decreased near free surface.
机译：为了理解变形奥氏体钢中的三维（3D）位错布置，我们首先研究了用扫描透射电子显微镜（茎）的电子断层扫描的适当成像条件。由于动力衍射对比度降低，例如厚度条纹和弯曲轮廓，在明亮场（BF）杆图像中清楚地观察到错位对比度。高位脱位对比度以高标本倾斜角保持。接下来，我们尝试使用两个BF-STEM倾斜系列进行3D重建，以避免错位线路。在得到的3D微观结构中，以任意取向清楚地观察到位错布置。整个重建空间中的位错的长度和密度分别为907μm和3.8×10〜（13）m〜（-2）。此外，证明脱位密度在自由表面附近逐渐降低。

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