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

J Chen and K Yoshida and T Suzudo and Y Shimada and K Inoue and TJ Konno and Y Nagai, MATERIALS TRANSACTIONS, 63, 468-474 (2022).

DOI: 10.2320/matertrans.MT-M2021233

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 (c) 1015 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.

Return to Publications page