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Evaluation of nano-sized oxide dispersion condition in ODS steel by atom probe tomography

アトムプローブを用いたODS鋼のナノサイズ酸化物分散粒子の分散状態評価

丹野 敬嗣  ; 矢野 康英  ; 岡 弘*   

Tanno, Takashi; Yano, Yasuhide; Oka, Hiroshi*

原子力機構が開発した9Cr-ODS鋼に3次元アトムプローブを適用し、ナノサイズの酸化物分散粒子の分散状態の評価を試みた。結果、微細な針状試験片内の分散状態の取得に成功した。3次元アトムプローブマッピングは、分散粒子がY-Ti-O複合酸化物であることを示すとともに、粒子内に化学組成の分布があることを示唆している。

3-dimensional atom prove tomography (3D-APT) was applied to JAEA 9Cr-ODS steel as trial, and the dispersion condition of nano-sized oxide was evaluated. 3D-APT was successfully carried out and the dispersion condition in tiny tip was obtained. 3D-APT mapping showed that the nano-sized oxide is Y-Ti-O complexed, and there could be chemical distribution.

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