A thermally activated model for room temperature creep in nanocrystalline Au films at intermediate stresses

Nikhil Karanjgaokar; Fernando Stump; Philippe Geubelle; Ioannis Chasiotis

doi:10.1016/j.scriptamat.2012.11.017

A thermally activated model for room temperature creep in nanocrystalline Au films at intermediate stresses

Nikhil Karanjgaokar, Fernando Stump, Philippe Geubelle, Ioannis Chasiotis

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

Abstract

Uniaxial tension creep experiments conducted on free-standing nanocrystalline Au films with 40 nm grain size showed high initial primary creep rates of 3.3 × 10^-8-2.7 × 10^-7 s ^-1, reaching steady-state creep rates of 5.5 × 10 ^-9-1.1 × 10^-8 s^-1 after 5-6 h. The isochronous creep curves pointed to the need for a nonlinear creep model based on the kinetics of thermal activation, which captured well the effect of applied stress amplitude. The implications of this model on the long term stability of nanocrystalline films were explored numerically for periodic stress profiles.

Original language	English (US)
Pages (from-to)	551-554
Number of pages	4
Journal	Scripta Materialia
Volume	68
Issue number	8
DOIs	https://doi.org/10.1016/j.scriptamat.2012.11.017
State	Published - Apr 2013

Keywords

Grain boundary sliding
Nonlinear viscoelasticity
Thermally activated processes
Thin films

ASJC Scopus subject areas

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

Online availability

10.1016/j.scriptamat.2012.11.017

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title = "A thermally activated model for room temperature creep in nanocrystalline Au films at intermediate stresses",

abstract = "Uniaxial tension creep experiments conducted on free-standing nanocrystalline Au films with 40 nm grain size showed high initial primary creep rates of 3.3 × 10-8-2.7 × 10-7 s -1, reaching steady-state creep rates of 5.5 × 10 -9-1.1 × 10-8 s-1 after 5-6 h. The isochronous creep curves pointed to the need for a nonlinear creep model based on the kinetics of thermal activation, which captured well the effect of applied stress amplitude. The implications of this model on the long term stability of nanocrystalline films were explored numerically for periodic stress profiles.",

keywords = "Grain boundary sliding, Nonlinear viscoelasticity, Thermally activated processes, Thin films",

author = "Nikhil Karanjgaokar and Fernando Stump and Philippe Geubelle and Ioannis Chasiotis",

note = "Funding Information: The authors gratefully acknowledge the support by the National Science Foundation under Grant CMMI#0927149 ARRA . The authors would like to thank Prof. Dimitrios Peroulis and his group from Purdue University for providing the Au films for this work. Copyright: Copyright 2013 Elsevier B.V., All rights reserved.",

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doi = "10.1016/j.scriptamat.2012.11.017",

language = "English (US)",

volume = "68",

pages = "551--554",

journal = "Scripta Materialia",

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AU - Karanjgaokar, Nikhil

AU - Stump, Fernando

AU - Geubelle, Philippe

AU - Chasiotis, Ioannis

N1 - Funding Information: The authors gratefully acknowledge the support by the National Science Foundation under Grant CMMI#0927149 ARRA . The authors would like to thank Prof. Dimitrios Peroulis and his group from Purdue University for providing the Au films for this work. Copyright: Copyright 2013 Elsevier B.V., All rights reserved.

PY - 2013/4

Y1 - 2013/4

N2 - Uniaxial tension creep experiments conducted on free-standing nanocrystalline Au films with 40 nm grain size showed high initial primary creep rates of 3.3 × 10-8-2.7 × 10-7 s -1, reaching steady-state creep rates of 5.5 × 10 -9-1.1 × 10-8 s-1 after 5-6 h. The isochronous creep curves pointed to the need for a nonlinear creep model based on the kinetics of thermal activation, which captured well the effect of applied stress amplitude. The implications of this model on the long term stability of nanocrystalline films were explored numerically for periodic stress profiles.

AB - Uniaxial tension creep experiments conducted on free-standing nanocrystalline Au films with 40 nm grain size showed high initial primary creep rates of 3.3 × 10-8-2.7 × 10-7 s -1, reaching steady-state creep rates of 5.5 × 10 -9-1.1 × 10-8 s-1 after 5-6 h. The isochronous creep curves pointed to the need for a nonlinear creep model based on the kinetics of thermal activation, which captured well the effect of applied stress amplitude. The implications of this model on the long term stability of nanocrystalline films were explored numerically for periodic stress profiles.

KW - Grain boundary sliding

KW - Nonlinear viscoelasticity

KW - Thermally activated processes

KW - Thin films

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A thermally activated model for room temperature creep in nanocrystalline Au films at intermediate stresses

Abstract

Keywords

ASJC Scopus subject areas

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