Age-hardening in a two component immiscible nanolaminate metal system

Chang Eun Kim; Raheleh M. Rahimi; Tyler L. Maxwell; T. John Balk; David F. Bahr

doi:10.1016/j.scriptamat.2017.03.037

Age-hardening in a two component immiscible nanolaminate metal system

Chang Eun Kim
, Raheleh M. Rahimi
, Tyler L. Maxwell
, T. John Balk
, David F. Bahr

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

1 Scopus citations

Abstract

Density functional theory was used to predict the diffusion and precipitation of Cr in Cu. The energy barrier of Cr diffusion in Cu is comparable to the self-diffusion of Cr, and higher than the energy barrier of Cu self-diffusion. The simulations support the experimentally measured hardness of 30 nm thick nanolaminate layers of Cr/Cu-3.4%Cr. As-deposited films had a hardness of 6.25 GPa; annealing at 373 K decreased hardness to 5.95 GPa, while annealing at 573 K increased the hardness to 6.6 GPa. Transmission electron microscopy indicates there is significant local strain due to precipitation, in agreement with theoretical predictions.

Original language	English
Pages (from-to)	33-36
Number of pages	4
Journal	Scripta Materialia
Volume	136
DOIs	https://doi.org/10.1016/j.scriptamat.2017.03.037
State	Published - Jul 15 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd

Funding

The authors acknowledge support of the Electron Microscopy Center at the University of Kentucky and the financial support of the National Science Foundation under grant number CMMI 1634772. We greatly appreciate the assistance of Prof. Xinghang Zhang, Qiang Li, and Sichuang Xue of Purdue University for their assistance in performing SAED measurements and Dr. Nicolas Briot for FIB sample preparation.

Funders	Funder number
Sichuang Xue of Purdue University
National Science Foundation Arctic Social Science Program	1634772, CMMI 1634772
University of Kentucky

Keywords

Density functional theory (DFT)
Multilayers
Nanoindentation
Precipitation
Sputtering

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.2017.03.037

Cite this

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title = "Age-hardening in a two component immiscible nanolaminate metal system",

abstract = "Density functional theory was used to predict the diffusion and precipitation of Cr in Cu. The energy barrier of Cr diffusion in Cu is comparable to the self-diffusion of Cr, and higher than the energy barrier of Cu self-diffusion. The simulations support the experimentally measured hardness of 30 nm thick nanolaminate layers of Cr/Cu-3.4\%Cr. As-deposited films had a hardness of 6.25 GPa; annealing at 373 K decreased hardness to 5.95 GPa, while annealing at 573 K increased the hardness to 6.6 GPa. Transmission electron microscopy indicates there is significant local strain due to precipitation, in agreement with theoretical predictions.",

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doi = "10.1016/j.scriptamat.2017.03.037",

language = "English",

volume = "136",

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AU - Kim, Chang Eun

AU - Rahimi, Raheleh M.

AU - Maxwell, Tyler L.

AU - Balk, T. John

AU - Bahr, David F.

PY - 2017/7/15

Y1 - 2017/7/15

N2 - Density functional theory was used to predict the diffusion and precipitation of Cr in Cu. The energy barrier of Cr diffusion in Cu is comparable to the self-diffusion of Cr, and higher than the energy barrier of Cu self-diffusion. The simulations support the experimentally measured hardness of 30 nm thick nanolaminate layers of Cr/Cu-3.4%Cr. As-deposited films had a hardness of 6.25 GPa; annealing at 373 K decreased hardness to 5.95 GPa, while annealing at 573 K increased the hardness to 6.6 GPa. Transmission electron microscopy indicates there is significant local strain due to precipitation, in agreement with theoretical predictions.

AB - Density functional theory was used to predict the diffusion and precipitation of Cr in Cu. The energy barrier of Cr diffusion in Cu is comparable to the self-diffusion of Cr, and higher than the energy barrier of Cu self-diffusion. The simulations support the experimentally measured hardness of 30 nm thick nanolaminate layers of Cr/Cu-3.4%Cr. As-deposited films had a hardness of 6.25 GPa; annealing at 373 K decreased hardness to 5.95 GPa, while annealing at 573 K increased the hardness to 6.6 GPa. Transmission electron microscopy indicates there is significant local strain due to precipitation, in agreement with theoretical predictions.

KW - Density functional theory (DFT)

KW - Multilayers

KW - Nanoindentation

KW - Precipitation

KW - Sputtering

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U2 - 10.1016/j.scriptamat.2017.03.037

DO - 10.1016/j.scriptamat.2017.03.037

M3 - Article

AN - SCOPUS:85018594024

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VL - 136

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JO - Scripta Materialia

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ER -

Age-hardening in a two component immiscible nanolaminate metal system

Abstract

Bibliographical note

Funding

Keywords

ASJC Scopus subject areas

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