Kyoto University · 材料科学
Qiu Xu教授の研究室では、高エネルギー粒子照射や塑性変形が金属・合金に与える微視的損傷機構を、第一原理計算と実験を融合して解明しています。特に、高エントロピー合金や銅析出相を含むFe-Cu系合金における点欠陥の形成挙動や、空孔クラスターやスターリング・フォールトテトラヘドロン（SFT）の生成抑制機構に注目しています。放射線損傷における原子レベルのメカニズムの解明を通じて、核材料や高強度構造材料の耐久性向上に貢献することを目的としています。
Figures are computed from collected data and may differ slightly.
The formation of Cu precipitates was investigated in two $\mathrm{Fe}\text{\ensuremath{-}}\mathrm{Cu}$ binary model alloys irradiated at $573\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ with fission neutrons at doses from $4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ to $6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$ displacement per atom (dpa). Experimental positron annihilation results indicated that Cu precipitates were formed even after irradiation to $4\ifmmode\times\els
When face-centered cubic (FCC) metals and alloys with low stacking fault energy (SFE) are irradiated by high-energy particles or deformed at high speed, stacking fault tetrahedra (SFTs), which are a type of vacancy cluster defect, are often formed. Therefore, SFTs were expected to form in the CoCrFeMnNi equiatomic high-entropy alloy (HEA). However, no SFT was observed in the CoCrFeMnNi HEA with high-speed plastic deformation even after annealing at 873 K. To elucidate this mechanism, the binding
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