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Open AccessArticle

Anelastic Behavior of Small Dimensioned Aluminum

1
Department of Physics and Astronomy, Bologna University, Viale Berti Pichat 6/2, I-40127 Bologna, Italy
2
Department of Industrial Engineering, Rome University “Tor Vergata”, Via del Politecnico, 1-00133 Roma, Italy
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 549; https://doi.org/10.3390/met9050549
Received: 18 March 2019 / Revised: 6 May 2019 / Accepted: 9 May 2019 / Published: 11 May 2019
(This article belongs to the Special Issue Processing-Structure-Property Relationships in Metals)
In the present research, results are presented regarding the anelasticity of 99.999% pure aluminum thin films, either deposited on silica substrates or as free-standing sheets obtained by cold rolling. Mechanical Spectroscopy (MS) tests, namely measurements of dynamic modulus and damping vs. temperature, were performed using a vibrating reed analyzer under vacuum. The damping vs. temperature curves of deposited films exhibit two peaks which tend to merge into a single peak as the specimen thickness increases above 0.2 µm. The thermally activated anelastic relaxation processes observed on free-standing films are strongly dependent on film thickness, and below a critical value of about 20 µm two anelastic relaxation peaks can be observed; both their activation energy and relaxation strength are affected by film thickness. These results, together with those observed on bulk specimens, are indicative of specific dislocation and grain boundary dynamics, constrained by the critical values of the ratio of film thickness to grain size. View Full-Text
Keywords: damping; aluminum film; grain boundary; anelasticity; thin aluminum sheet damping; aluminum film; grain boundary; anelasticity; thin aluminum sheet
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MDPI and ACS Style

Campari, E.G.; Amadori, S.; Bonetti, E.; Berti, R.; Montanari, R. Anelastic Behavior of Small Dimensioned Aluminum. Metals 2019, 9, 549.

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