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引張負荷下で単一すべり系が活動するアルミニウム単結晶の延性損傷評価

Evaluation of ductile damage in aluminum single crystal with prior activity of single slip system under tensile loading

柴野 純一*; 梶原 堅太郎*; 塚本 拓也*; 河合 紘和*; 三浦 節男*; Zhang, S.*; 菖蒲 敬久 

Shibano, Junichi*; Kajiwara, Kentaro*; Tsukamoto, Takuya*; kawai, Hirokazu*; Miura, Setsuo*; Zhang, S.*; Shobu, Takahisa

SPring-8、BL28B2からの白色X線を利用し、アルミニウム単結晶の延性破壊進展挙動の検証を実施した。その結果、以下の2点を明らかにした。(1)延性損傷進展に伴い発生した転移セルの回転は、水辺面内に比べ垂直面内で大きく、特に負荷ひずみ0.05のときのノッチ近傍の角度変化が大変大きく、これは引張負荷によるAl(111)面のすべり活動が転位セルの生成と回転に大きな影響を及ぼしている。(2)転位密度は材料の延性損傷が進むことで全体に増加したが、ノッチ近傍では相対的に低く、これは延性損傷進展によるひずみエネルギーの解放の影響によるものである可能性を見出した。

A ductile damage progress of an aluminum single crystal with the prior activity of the single slip system under tensile loading was verified by a profile analysis using white X-ray obtained in BL28B2 beam line of SPring-8. In profile analysis, an instrumental function was defined in consideration both of a divergence by slits and a response function peculiar to the energy dispersive method. As a result, dislocation density increased as ductile damage progressed, but it was relatively low near the notch. The influence of a release of the strain energy by a ductile damage progress was expected. The characteristics of ductile damage progress near the notch of the aluminum single crystal with a prior activity of a single slip system under the tensile loading were clarified from the distribution of dislocation density.

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