Texture dependent strain rate sensitivity of ultrafine-grained aluminum films. (15th March 2016)

• Record Type: Journal Article
• Authors: Izadi, Ehsan; Rajagopalan, Jagannathan
• Is Part Of: Scripta materialia. Volume 114(2016)
• Page Start: 65
• Page End: 69
• Publication Date: 2016-03-15
• Subjects: Strain rate sensitivity -- Texture -- Grain rotation -- Thin films -- TEM; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2015.12.003
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: We investigated the strain rate sensitivity (SRS) of freestanding ultrafine-grained aluminum films with similar thickness (~ 240 nm) and mean grain size (~ 275 nm) but highly dissimilar texture. For (110) textured bicrystalline films, flow stress increased by 14% ( m = 0.017) as the strain rate was varied from ~ 7 × 10 − 6 /s to 5 × 10 − 3 /s. In contrast, for non-textured films the flow stress increased by more than 90% ( m = 0.103) over a similar strain rate range. The drastic difference in SRS can be explained by texture-induced changes in deformation mechanisms of the films, as revealed by in situ TEM straining experiments. Graphical abstract: