Critical dimension for the dislocation structure in deformed copper micropillars. (1st April 2019)

• Record Type: Journal Article
• Authors: Zhao, X.X.; Wu, J.; Chiu, Y.L.; Jones, I.P.; Gu, R.; Ngan, A.H.W.
• Is Part Of: Scripta materialia. Number 163(2019)
• Page Start: 137
• Page End: 141
• Publication Date: 2019-04-01
• Subjects: Copper -- Micropillar -- Dislocation cell -- Fractal -- Focussed ion beam (FIB); Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2019.01.020
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Although the effect of specimen size on strength has been well documented for metal micro-samples significantly larger than ~1 μm, less is known about the deformation induced dislocation structure, especially just above the size at which dislocation starvation happens. Here, uniaxial compression tests were performed on cylindrical [011] oriented copper micropillars with diameters of 1 μm, 3 μm and 5 μm. Dislocation cells formed in a fractal geometry in the 3 μm and 5 μm pillars, while dislocations were not retained in the 1 μm pillars. The effects of strain and strain rate on cell formation were also investigated. Graphical abstract: Unlabelled Image