Deformation mechanisms of ultra-thin Al layers in Al/SiC nanolaminates as a function of thickness and temperature
Abstract
The mechanical properties of Al/SiC nanolaminates with layer thicknesses between 10 and 100 nm were studied by nanoindentation in the temperature range 25 to 100 °C. The strength of the Al layers as a function of the layer thickness and temperature was obtained from the hardness of the nanolaminates by an inverse methodology based on the numerical simulation of the nanoindentation tests by means of the finite element method. The room temperature yield stress of the Al layers showed a large ‘the thinner, the stronger’ effect, which depended not only on the layer thickness but also on the microstructure, which changed with the Al layer thickness. The yield stress of the Al layers at ambient temperature was compatible with a deformation mechanism controlled by the interaction of dislocations with grain boundaries for the thicker layers (>50 nm), while confined layer slip appeared to be dominant for layers below 50 nm. There was a dramatic reduction in the Al yield stress with temperature, which increased as the Al layer thickness decreased, and led to an inverse size effect at 100 °C. In conclusion, this behavior was compatible with plastic deformation mechanisms controlled by grain boundary and interface diffusion at 100 °C,more »
- Authors:
-
[1]
- IMDEA Materials Institute, Madrid (Spain)
- Arizona State Univ., Tempe, AZ (United States)
- IMDEA Materials Institute, Madrid (Spain); Polytechnic Univ. of Madrid, Madrid (Spain)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); Spanish Ministry of Economy and Competitiveness; Chinese Scholarship Council (CSC); Spanish Ministry of Education
- OSTI Identifier:
- 1418605
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Philosophical Magazine (2003, Print)
- Additional Journal Information:
- Journal Name: Philosophical Magazine (2003, Print); Journal Volume: 96; Journal Issue: 32-34; Journal ID: ISSN 1478-6435
- Publisher:
- Taylor & Francis
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Multilayers; nanoindentation; thin-films; finite element modeling
Citation Formats
Yang, L. W., Mayer, C., Chawla, N., Llorca, J., and Molina-Aldareguía, J. M. Deformation mechanisms of ultra-thin Al layers in Al/SiC nanolaminates as a function of thickness and temperature. United States: N. p., 2016.
Web. doi:10.1080/14786435.2016.1219075.
Yang, L. W., Mayer, C., Chawla, N., Llorca, J., & Molina-Aldareguía, J. M. Deformation mechanisms of ultra-thin Al layers in Al/SiC nanolaminates as a function of thickness and temperature. United States. https://doi.org/10.1080/14786435.2016.1219075
Yang, L. W., Mayer, C., Chawla, N., Llorca, J., and Molina-Aldareguía, J. M. Tue .
"Deformation mechanisms of ultra-thin Al layers in Al/SiC nanolaminates as a function of thickness and temperature". United States. https://doi.org/10.1080/14786435.2016.1219075. https://www.osti.gov/servlets/purl/1418605.
@article{osti_1418605,
title = {Deformation mechanisms of ultra-thin Al layers in Al/SiC nanolaminates as a function of thickness and temperature},
author = {Yang, L. W. and Mayer, C. and Chawla, N. and Llorca, J. and Molina-Aldareguía, J. M.},
abstractNote = {The mechanical properties of Al/SiC nanolaminates with layer thicknesses between 10 and 100 nm were studied by nanoindentation in the temperature range 25 to 100 °C. The strength of the Al layers as a function of the layer thickness and temperature was obtained from the hardness of the nanolaminates by an inverse methodology based on the numerical simulation of the nanoindentation tests by means of the finite element method. The room temperature yield stress of the Al layers showed a large ‘the thinner, the stronger’ effect, which depended not only on the layer thickness but also on the microstructure, which changed with the Al layer thickness. The yield stress of the Al layers at ambient temperature was compatible with a deformation mechanism controlled by the interaction of dislocations with grain boundaries for the thicker layers (>50 nm), while confined layer slip appeared to be dominant for layers below 50 nm. There was a dramatic reduction in the Al yield stress with temperature, which increased as the Al layer thickness decreased, and led to an inverse size effect at 100 °C. In conclusion, this behavior was compatible with plastic deformation mechanisms controlled by grain boundary and interface diffusion at 100 °C, which limit the strength of the ultra-thin Al layers.},
doi = {10.1080/14786435.2016.1219075},
journal = {Philosophical Magazine (2003, Print)},
number = 32-34,
volume = 96,
place = {United States},
year = {Tue Aug 16 00:00:00 EDT 2016},
month = {Tue Aug 16 00:00:00 EDT 2016}
}
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