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  Advanced nanomechanics in the TEM: Effects of thermal annealing on FIB prepared Cu samples

Kiener, D., Zhang, Z., Šturm, S., Cazottes, S., Imrich, P. J., Kirchlechner, C., et al. (2012). Advanced nanomechanics in the TEM: Effects of thermal annealing on FIB prepared Cu samples. Philosophical Magazine, 92(25-27): 185, pp. 3269-3289. doi:10.1080/14786435.2012.685966.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-1D01-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-555B-5
Genre: Journal Article

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 Creators:
Kiener, Daniel1, Author              
Zhang, Z.2, Author              
Šturm, Sašo3, Author              
Cazottes, S.2, Author              
Imrich, P. J.2, Author              
Kirchlechner, C.4, Author              
Dehm, G.2, 4, Author              
Affiliations:
1Department of Materials Physics, Montanuniversität Leoben, Austria, ou_persistent22              
2Erich Schmid Institute of Material Science, Austrian Academy of Sciences , Leoben , Austria, ou_persistent22              
3Institut Jožef Stefan, Department for Nanostructured Materials, Ljubljana, Slovenia, ou_persistent22              
4Department Materialphysik, Montanuniversität Leoben, Austria, ou_persistent22              

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 Abstract: The effect of focused ion beam (FIB) fabrication on the mechanical properties of miniaturized mechanical tests has recently been realized, but is not well documented. In this study, the effect of post thermal annealing on the plastic properties of FIB fabricated micro- and nanometer-sized Cu samples was studied by means of advanced analytic and in situ transmission electron microscopy. In situ heating experiments on thin films and pillars revealed a reduction of the initially high dislocation density, but never a recovery of the bulk dislocation density. Aberration-corrected atomic imaging documented the recovery of a pristine crystalline surface structure upon annealing, while electron energy-loss spectroscopy showed that the remaining contamination layer consisted of amorphous carbon. These structural observations were combined with the mechanical data from in situ tests of annealed micro- and nanometer-sized tensile and compression samples. The thermal annealing in the micron regime mainly influences the initial yield point, as it reduces the number of suited dislocation sources, while the flow behavior is mostly unaffected. For the submicron samples, the annealed material sustains significantly higher stresses throughout the deformation. This is explained by the high stresses required for surfacemediated dislocation nucleation of the annealed material at the nanoscale. In the present case, the FIB affected the surface near defects and facilitated dislocation nucleation, thereby lowering the material strength.

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Language(s): eng - English
 Dates: 2011-09-262012-04-132012-05-17
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1080/14786435.2012.685966
 Degree: -

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Title: Philosophical Magazine
Source Genre: Journal
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Publ. Info: Milton Park, Abingdon, England : Taylor & Francis
Pages: - Volume / Issue: 92 (25-27) Sequence Number: 185 Start / End Page: 3269 - 3289 Identifier: ISSN: 1478-6435
CoNE: /journals/resource/954925265237