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Deformation-mechanism dependent stretchability of nanocrystalline gold films on flexible substrates

Published online by Cambridge University Press:  05 September 2017

Xue-Mei Luo  and
Guang-Ping Zhang
Xue-Mei Luo
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Guang-Ping Zhang*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: gpzhang@imr.ac.cn
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Abstract

Stretchability of polyimide-supported nanocrystalline Au films with a thickness ranging from 930 to 20 nm was evaluated by uniaxial tensile testing. The results show that the fracture strain gradually decreased with decreasing the film thickness. Such degraded stretchability depends on plastic deformation mechanisms associated with the length scales. As the film thickness is larger than 90 nm, local thinning in the grown grains contributed to the high stretchability. Full dislocation behaviors including dislocation pileup in the 930 nm-thick film, the activation of Frank–Read dislocation source in the 170 nm-thick film and the grain boundary dislocation source in the 90 nm-thick film were dominated plastic deformation. As the film thickness is less than 40 nm, low stretchability of thin films resulted from intergranular fracture, and partial dislocation behaviors became prevailed. Evident grain growth happened in the films studied except for the 20 nm-thick film, which is expected to be involved in the stretchability of the nanocrystalline metal films on flexible substrates.

Keywords

thin filmnanocrystallinestretchabilitydeformationfracture
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 18 , 28 September 2017 , pp. 3516 - 3523
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: George M. Pharr

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