Texture dependent strain rate sensitivity of ultrafine-grained aluminum films

Ehsan Izadi; Jagannathan Rajagopalan

doi:10.1016/j.scriptamat.2015.12.003

Texture dependent strain rate sensitivity of ultrafine-grained aluminum films

Ehsan Izadi, Jagannathan Rajagopalan

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

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.

Original language	English (US)
Pages (from-to)	65-69
Number of pages	5
Journal	Scripta Materialia
Volume	114
DOIs	https://doi.org/10.1016/j.scriptamat.2015.12.003
State	Published - Mar 15 2016

Keywords

Grain rotation
Strain rate sensitivity
TEM
Texture
Thin films

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2015.12.003

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title = "Texture dependent strain rate sensitivity of ultrafine-grained aluminum films",

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.",

keywords = "Grain rotation, Strain rate sensitivity, TEM, Texture, Thin films",

author = "Ehsan Izadi and Jagannathan Rajagopalan",

note = "Funding Information: This project was funded by the National Science Foundation (NSF) grants CMMI 1400505 and DMR 1454109 . The authors would like to gratefully acknowledge the use of facilities at the John M. Cowley Centre for High Resolution Electron Microscopy and the Centre for Solid State Electronics Research at Arizona State University. Appendix A Publisher Copyright: {\textcopyright} 2015 Elsevier B.V. All rights reserved.",

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doi = "10.1016/j.scriptamat.2015.12.003",

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T1 - Texture dependent strain rate sensitivity of ultrafine-grained aluminum films

AU - Izadi, Ehsan

AU - Rajagopalan, Jagannathan

N1 - Funding Information: This project was funded by the National Science Foundation (NSF) grants CMMI 1400505 and DMR 1454109 . The authors would like to gratefully acknowledge the use of facilities at the John M. Cowley Centre for High Resolution Electron Microscopy and the Centre for Solid State Electronics Research at Arizona State University. Appendix A Publisher Copyright: © 2015 Elsevier B.V. All rights reserved.

PY - 2016/3/15

Y1 - 2016/3/15

N2 - 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.

AB - 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.

KW - Grain rotation

KW - Strain rate sensitivity

KW - TEM

KW - Texture

KW - Thin films

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SP - 65

EP - 69

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Texture dependent strain rate sensitivity of ultrafine-grained aluminum films

Abstract

Keywords

ASJC Scopus subject areas

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