Nanoscale Kirkendall porosity formation during grain boundary intermixing in Au/Ag thin film system

Clear experimental evidence is provided on porosity formation along grain boundaries in Ag during intermixing in nanocrystalline Ag(15nm)/Au(15nm) thin film at low temperature (at 150°C), where the bulk diffusion processes are completely frozen out. The porosity formation was suppressed by applicati...

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Bibliographic Details
Published in:Materials letters 2015-04, Vol.145, p.67-69
Main Authors: Shenouda, S.S., Katona, G.L., Langer, G.A., Daróczi, L., Beke, D.L.
Format: Article
Language:English
Subjects:
Boundaries
DIGM
Formations
Gold
Grain boundaries
Grain boundary interdiffusion
Homogenizing
Kirkendall porosity
Porosity
Silver
Thin films
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Summary:Clear experimental evidence is provided on porosity formation along grain boundaries in Ag during intermixing in nanocrystalline Ag(15nm)/Au(15nm) thin film at low temperature (at 150°C), where the bulk diffusion processes are completely frozen out. The porosity formation was suppressed by application of 100bar pressure. The interdiffusion leads to homogenization in both the Ag and Au layers up to levels corresponding to compositions left behind the moving boundaries during grain boundary diffusion induced grain boundary motion. •Evidence of nano-pores in Ag during grain boundary diffusion in Ag/Au system.•The porosity formation is suppressed by application of 100bar pressure.•Homogenization up to compositions corresponding to the alloyed zone in DIGM.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2015.01.044