Migration and roughening of Σ3{1 1 2} incoherent twin boundary in an Au nanocrystalline film

• Published in: Materials characterization Vol. 159; p. 110063
• Main Authors: Lee, Sung Bo, Yoo, Seung Jo, Choi, Kwangdeok, Byun, Ji Young, Kim, Chang-Yeon
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.01.2020
• Subjects: Grain-boundary migration; Kinetic roughening; Nanocrystalline film; {1 1 2} incoherent twin boundary; {1 1 2} incoherent twin boundary; Kinetic roughening; Au; Grain-boundary migration; Nanocrystalline film
• ISSN: 1044-5803; 1873-4189
• DOI: 10.1016/j.matchar.2019.110063

High-resolution electron microscopy is used to elucidate the structural transition of {1 1 2} incoherent twin boundaries under a driving force for migration in an Au nanocrystalline film. Initially flat {1 1 2} twin boundaries bounding island and peninsula grains in the film tend to become smoothly curved, corresponding to the atomically-roughened structure, after annealing at an elevated temperature of 300 °C. Previous studies have indicated that the {1 1 2} twin boundaries remain atomically sharp at least at 300 °C, which thus strongly suggests that the boundaries undergo roughening transition by a driving force for migration, a signature of kinetic roughening. [Display omitted] •Migration of {1 1 2} twin boundaries are studied in an Au nanocrystalline film.•Flat {1 1 2} twin boundaries are observed to be curved after annealing at 300 °C.•The observation is attributed to grain-boundary kinetic roughening.