On plastic strain recovery in freestanding nanocrystalline metal thin films

Jagannathan Rajagopalan; Jong H. Han; M. Taher A. Saif

doi:10.1016/j.scriptamat.2008.02.060

On plastic strain recovery in freestanding nanocrystalline metal thin films

Jagannathan Rajagopalan, Jong H. Han, M. Taher A. Saif

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

22 Scopus citations

Abstract

In a recent article [J. Rajagopalan, J.H. Han, M.T.A. Saif, Science 315 (2007) 1831-1834], we have reported substantial (50-100%) plastic strain recovery in freestanding nanocrystalline metal films (grain size 50-65 nm) after unloading. The strain recovery was time dependent and thermally activated. Here we model the time evolution of this strain recovery in terms of a thermally activated dislocation propagation mechanism. The model predicts an activation volume of ≈42b³ for the strain recovery process in aluminum.

Original language	English (US)
Pages (from-to)	921-926
Number of pages	6
Journal	Scripta Materialia
Volume	59
Issue number	9
DOIs	https://doi.org/10.1016/j.scriptamat.2008.02.060
State	Published - Nov 2008
Externally published	Yes

Keywords

Nanocrystalline microstructure
Plastic deformation
Strain recovery
Thermally activated processes
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.2008.02.060

Cite this

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title = "On plastic strain recovery in freestanding nanocrystalline metal thin films",

abstract = "In a recent article [J. Rajagopalan, J.H. Han, M.T.A. Saif, Science 315 (2007) 1831-1834], we have reported substantial (50-100%) plastic strain recovery in freestanding nanocrystalline metal films (grain size 50-65 nm) after unloading. The strain recovery was time dependent and thermally activated. Here we model the time evolution of this strain recovery in terms of a thermally activated dislocation propagation mechanism. The model predicts an activation volume of ≈42b3 for the strain recovery process in aluminum.",

keywords = "Nanocrystalline microstructure, Plastic deformation, Strain recovery, Thermally activated processes, Thin films",

author = "Jagannathan Rajagopalan and Han, {Jong H.} and Saif, {M. Taher A.}",

note = "Funding Information: This material is based upon work supported by the National Science Foundation under Award No. NSF ECS-0304243 and Award No. NSF CMMI-0728189.",

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doi = "10.1016/j.scriptamat.2008.02.060",

language = "English (US)",

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T1 - On plastic strain recovery in freestanding nanocrystalline metal thin films

AU - Rajagopalan, Jagannathan

AU - Han, Jong H.

AU - Saif, M. Taher A.

N1 - Funding Information: This material is based upon work supported by the National Science Foundation under Award No. NSF ECS-0304243 and Award No. NSF CMMI-0728189.

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Y1 - 2008/11

N2 - In a recent article [J. Rajagopalan, J.H. Han, M.T.A. Saif, Science 315 (2007) 1831-1834], we have reported substantial (50-100%) plastic strain recovery in freestanding nanocrystalline metal films (grain size 50-65 nm) after unloading. The strain recovery was time dependent and thermally activated. Here we model the time evolution of this strain recovery in terms of a thermally activated dislocation propagation mechanism. The model predicts an activation volume of ≈42b3 for the strain recovery process in aluminum.

AB - In a recent article [J. Rajagopalan, J.H. Han, M.T.A. Saif, Science 315 (2007) 1831-1834], we have reported substantial (50-100%) plastic strain recovery in freestanding nanocrystalline metal films (grain size 50-65 nm) after unloading. The strain recovery was time dependent and thermally activated. Here we model the time evolution of this strain recovery in terms of a thermally activated dislocation propagation mechanism. The model predicts an activation volume of ≈42b3 for the strain recovery process in aluminum.

KW - Nanocrystalline microstructure

KW - Plastic deformation

KW - Strain recovery

KW - Thermally activated processes

KW - Thin films

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On plastic strain recovery in freestanding nanocrystalline metal thin films

Abstract

Keywords

ASJC Scopus subject areas

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