In Situ TEM Observation and MD Simulation of Frank Partial Dislocation Climbing in Al–Cu Alloy

Jiao Chen; Kenta Yoshida; Tomoaki Suzudo; Yusuke Shimada; Koji Inoue; Toyohiko J. Konno; Yasuyoshi Nagai

doi:10.2320/matertrans.MT-M2021233

Materials Physics

In Situ TEM Observation and MD Simulation of Frank Partial Dislocation Climbing in Al–Cu Alloy

Jiao Chen, Kenta Yoshida, Tomoaki Suzudo, Yusuke Shimada, Koji Inoue, Toyohiko J. Konno, Yasuyoshi Nagai

Author information

Keywords: in situ transmission electron microscopy, lattice defect, dislocations, aluminum, aluminum copper alloy

JOURNAL FREE ACCESS FULL-TEXT HTML

2022 Volume 63 Issue 4 Pages 468-474

DOI https://doi.org/10.2320/matertrans.MT-M2021233

Browse “Advance online publication” version

Details

Abstract

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.

Fullsize Image

Corresponding author

Register with J-STAGE for free!