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Radiation enhanced precipitation of solute atoms in AlCu binary alloys; Energetic ion irradiation experiment and computer simulation

アルミ銅2元合金における照射促進偏析; 高エネルギーイオン照射実験と計算機シミュレーション

眞弓 蓮*; 千星 聡*; 岡本 芳浩; 斎藤 勇一*; 義家 敏正*; 岩瀬 彰宏*

Mayumi, Ren*; Semboshi, Satoshi*; Okamoto, Yoshihiro; Saito, Yuichi*; Yoshiie, Toshimasa*; Iwase, Akihiro*

アルミ銅2元合金を各種重イオンで照射し、銅の偏析に伴う硬度と銅原子周辺の局所原子配列変化をビッカース硬度計、EXAFS法により評価した。照射による硬度変化は、高温時効による変化よりも早く起こり、硬度上昇も大きい。また、実験で得られたEXAFSスペクトルとFEFFによって計算したスペクトルの比較により、照射によって微細な銅析出物が形成されていることが示唆された。反応方程式による計算機シミュレーションでも、銅析出物の形成と成長が再現され、それは実験結果と定性的に一致する。

AlCu binary alloys were irradiated with 16 MeV Au, 4.5 MeV Ni or 4.5 MeV Al ions at room temperature. Changes in surface hardness and the local atomic structure around Cu atoms were examined by using the Vickers hardness measurement and the EXAFS measurements, respectively. Some specimens were aged at 453 K and Vickers hardness was measured. The computer simulation was also performed by using the rate equation method. The hardness of irradiated specimens increased much faster than that of the aged specimens and it became larger than the maximum value of the hardness for the aged specimens. The comparison of the experimental EXAFS result with that of FEFF simulation suggests that the ion irradiation produced small Cu precipitates in the specimens. The computer simulation visualized the growth process of Cu precipitates during the irradiation, and the result qualitatively corresponds to the experimental result.

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