Orientation and length scale effects on dislocation structure in highly oriented nanotwinned Cu

38th Risø International Symposium on Materials Science

Lu, Qiuhong^1 ; Huang, Xiaoxu^2 ; Hansen, Niels^2 ; Lu, Lei^1

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang

110016, China^1

Section for Materials Science and Advanced Characterization, Department of Wind Energy, Technical University of Denmark, Riso Campus, Roskilde

DK-4000, Denmark^2

关键词: Dislocation cells;    Dislocation structures;    Length scale effects;    Mode II;    Mode III;    Nanotwinned;    Partial dislocations;    Twin boundaries;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/219/1/012032/pdf
DOI  :  10.1088/1757-899X/219/1/012032

来源: IOP

【 摘 要 】

Highly oriented nanotwinned Cu has been compressed to 6% strain in directions 90°, 0° and 45° with respect to the twin boundaries of the almost parallel twins. In the 90° and 0° compressed samples Mode I and Mode II dislocations and their interactions with twin boundaries dominate the deformation of twin/matrix (T/M) lamellae with thickness less than 500 nm. In 45° compressed samples, Mode III dislocations, especially partial dislocations moving along the twin boundaries, dominate the deformation of fine T/M lamellae with thickness less than 100 nm, while dislocations from slip Modes I, II and III are identified in T/M lamellae more than 100 nm thick, where these dislocations extensively interact in the T/M lamellae with thicknesses more than 200 nm. Dislocation cells are observed in a twin lamella with a thickness of about 500 nm.