Atomistic processes of diffusion-induced unusual compression fracture in metallic nanocrystals

Autor:	Sixue Zheng, Xiang Wang, Susheng Tan, Guofeng Wang, Scott X. Mao
Jazyk:	angličtina
Rok vydání:	2022
Předmět:	In situ atomic-scale surface atom diffusion dislocation compression fracture metallic nanocrystals Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	Materials Research Letters, Vol 10, Iss 12, Pp 805-812 (2022)
Druh dokumentu:	article
ISSN:	21663831 2166-3831
DOI:	10.1080/21663831.2022.2108349
Popis:	Local thickening, resulting from displacive or diffusive mechanisms individually, is frequently observed in nanoscale metals during compression. However, it is not fully understood how a coupled displacive-diffusive mechanism would mediate the compressive deformation of metallic nanocrystal. Here, by conducting in situ atomic-scale compression tests, we find that, instead of local thickening commonly reported thus far, abnormal thinning events consecutively occur in silver nanocrystals, where preexisting dislocations and crystal slip serve as stimuli to activate surface atom diffusion. Below a critical width, tensile-fracture-like failure occurs in the silver nanocrystals. This work sheds light on atomic-scale diffusion-mediated compressive deformation of metallic nanocrystal.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/54c006e3fb854ba8bbdd6b6d17d43703 Zobrazit plný text záznamu View record in DOAJ