In Situ TEM Observation and MD Simulation of Frank Partial Dislocation Climbing in AlCu Alloy

• Main Authors: Chen, J. (Author), Inoue, K. (Author), Konno, T.J (Author), Nagai, Y. (Author), Shimada, Y. (Author), Suzudo, T. (Author), Yoshida, K. (Author)
• Format: Article
• Language: English
• Published: Japan Institute of Metals (JIM) 2022
• Subjects: Al-Cu alloys; aluminum; Aluminum alloys; aluminum copper alloy; Aluminum-copper alloy; Binary alloys; Copper alloys; Dislocation; dislocations; Electron irradiation; Electrons; Frank loops; High resolution transmission electron microscopy; High-resolution transmission electron microscopy; in situ transmission electron microscopy; In-situ TEM; In-situ transmission electron microscopies; lattice defect; MD simulation; Molecular dynamics; Partial dislocations; TEM observations
• Online Access: View Fulltext in Publisher
• ISBN: 13459678 (ISSN)
• 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 aluminumcopper (AlCu) 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 0.0550.120 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 CuCu bonding in GuinierPreston zones was described as a possible pinning site of the dislocation climb by molecular dynamics simulation. © 2022 The Japan Institute of Metals and Materials.