Anelastic Behavior of Small Dimensioned Aluminum
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. tempera...
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| Format: | Article |
| Language: | English |
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MDPI AG
2019-05-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/9/5/549 |
| _version_ | 1818135295273467904 |
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| author | Enrico Gianfranco Campari Stefano Amadori Ennio Bonetti Raffaele Berti Roberto Montanari |
| author_facet | Enrico Gianfranco Campari Stefano Amadori Ennio Bonetti Raffaele Berti Roberto Montanari |
| author_sort | Enrico Gianfranco Campari |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-11T09:22:14Z |
| format | Article |
| id | doaj.art-0d0d5f5e02fd47059255aa7a3b2922d3 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-11T09:22:14Z |
| publishDate | 2019-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-0d0d5f5e02fd47059255aa7a3b2922d32022-12-22T01:13:14ZengMDPI AGMetals2075-47012019-05-019554910.3390/met9050549met9050549Anelastic Behavior of Small Dimensioned AluminumEnrico Gianfranco Campari0Stefano Amadori1Ennio Bonetti2Raffaele Berti3Roberto Montanari4Department of Physics and Astronomy, Bologna University, Viale Berti Pichat 6/2, I-40127 Bologna, ItalyDepartment of Physics and Astronomy, Bologna University, Viale Berti Pichat 6/2, I-40127 Bologna, ItalyDepartment of Physics and Astronomy, Bologna University, Viale Berti Pichat 6/2, I-40127 Bologna, ItalyDepartment of Physics and Astronomy, Bologna University, Viale Berti Pichat 6/2, I-40127 Bologna, ItalyDepartment of Industrial Engineering, Rome University “Tor Vergata”, Via del Politecnico, 1-00133 Roma, ItalyIn 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.https://www.mdpi.com/2075-4701/9/5/549dampingaluminum filmgrain boundaryanelasticitythin aluminum sheet |
| spellingShingle | Enrico Gianfranco Campari Stefano Amadori Ennio Bonetti Raffaele Berti Roberto Montanari Anelastic Behavior of Small Dimensioned Aluminum Metals damping aluminum film grain boundary anelasticity thin aluminum sheet |
| title | Anelastic Behavior of Small Dimensioned Aluminum |
| title_full | Anelastic Behavior of Small Dimensioned Aluminum |
| title_fullStr | Anelastic Behavior of Small Dimensioned Aluminum |
| title_full_unstemmed | Anelastic Behavior of Small Dimensioned Aluminum |
| title_short | Anelastic Behavior of Small Dimensioned Aluminum |
| title_sort | anelastic behavior of small dimensioned aluminum |
| topic | damping aluminum film grain boundary anelasticity thin aluminum sheet |
| url | https://www.mdpi.com/2075-4701/9/5/549 |
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