In Situ TEM Observation and MD Simulation of Frank Partial Dislocation Climbing in Al-Cu Alloy
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- Chen Jiao
- Institute for Materials Research, Tohoku University
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- Yoshida Kenta
- Institute for Materials Research, Tohoku University
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- Suzudo Tomoaki
- Institute for Materials Research, Tohoku University Center for Computational Science and e-Systems, Japan Atomic Energy Agency
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- Shimada Yusuke
- Institute for Materials Research, Tohoku University
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- Inoue Koji
- Institute for Materials Research, Tohoku University
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- Konno Toyohiko J.
- Institute for Materials Research, Tohoku University
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- Nagai Yasuyoshi
- Institute for Materials Research, Tohoku University
書誌事項
- タイトル別名
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- <i>In Situ</i> TEM Observation and MD Simulation of Frank Partial Dislocation Climbing in Al–Cu Alloy
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説明
<p>In situ electron irradiation using high-resolution transmission electron microscopy (HRTEM) was performed to visualize the Frank loop evolution in aluminum–copper (Al–Cu) alloy with an atomic-scale spatial resolution of 0.12 nm. The in situ HRTEM observation along the [110] direction of the FCC-Al lattice, Frank partial dislocation bounding an intrinsic stacking fault exhibited an asymmetrical climb along the ⟨112⟩ direction opposed to those in the reference pure Al under an electron irradiation, with a corresponding displacement-per-atom rate of 0.055–0.120 dpa/s in a high vacuum (1.2 × 10−5 Pa). We performed theoretical calculations to simulate the asymmetrical climb of the dislocation with Burgers vector b of 1/3⟨111⟩. The Cu–Cu bonding in Guinier–Preston zones was described as a possible pinning site of the dislocation climb by molecular dynamics simulation.</p>
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 63 (4), 468-474, 2022-04-01
公益社団法人 日本金属学会