Elastic Slow Dynamics in Polycrystalline Metal Alloys
Elastic slow dynamics, consisting in a reversible softening of materials when an external strain is applied, was experimentally observed in polycrystalline metals and presents analogies with the same phenomenon more widely observed in consolidated granular media. Since the effect is extremely small...
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| Format: | Article |
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MDPI AG
2021-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/18/8631 |
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| author | Jan Kober Alena Kruisova Marco Scalerandi |
| author_facet | Jan Kober Alena Kruisova Marco Scalerandi |
| author_sort | Jan Kober |
| collection | DOAJ |
| description | Elastic slow dynamics, consisting in a reversible softening of materials when an external strain is applied, was experimentally observed in polycrystalline metals and presents analogies with the same phenomenon more widely observed in consolidated granular media. Since the effect is extremely small in metals, precise experimental techniques are needed. Reliable measurement of relative velocity variations of the order of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>7</mn></mrow></msup></semantics></math></inline-formula> is crucial to perform the analysis. In addition, the grain structure and the nature of grain boundaries in metals is very different from that in rocks or concrete. Therefore, linking relaxation elastic effects to the microstructure is needed to understand the physical origin of slow dynamics in metals. Here, interpreting the relaxation phenomenon as a multirelaxation process, we show that it is sensitive to the spatial scale at the microstructural level, up to the point of allowing the identification of the existence of features at different spatial scales, particularly distinguishing damage from microstructural inhomogeneities. |
| first_indexed | 2024-03-10T07:55:20Z |
| format | Article |
| id | doaj.art-9d749ebe119146d8b7f6ac9451e78208 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T07:55:20Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-9d749ebe119146d8b7f6ac9451e782082023-11-22T11:55:48ZengMDPI AGApplied Sciences2076-34172021-09-011118863110.3390/app11188631Elastic Slow Dynamics in Polycrystalline Metal AlloysJan Kober0Alena Kruisova1Marco Scalerandi2Institute of Thermomechanics of the Czech Academy of Sciences, 18200 Prague, Czech RepublicInstitute of Thermomechanics of the Czech Academy of Sciences, 18200 Prague, Czech RepublicDISAT, Condensed Matter Physics and Complex Systems Institute, Politecnico di Torino, 10129 Torino, ItalyElastic slow dynamics, consisting in a reversible softening of materials when an external strain is applied, was experimentally observed in polycrystalline metals and presents analogies with the same phenomenon more widely observed in consolidated granular media. Since the effect is extremely small in metals, precise experimental techniques are needed. Reliable measurement of relative velocity variations of the order of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>7</mn></mrow></msup></semantics></math></inline-formula> is crucial to perform the analysis. In addition, the grain structure and the nature of grain boundaries in metals is very different from that in rocks or concrete. Therefore, linking relaxation elastic effects to the microstructure is needed to understand the physical origin of slow dynamics in metals. Here, interpreting the relaxation phenomenon as a multirelaxation process, we show that it is sensitive to the spatial scale at the microstructural level, up to the point of allowing the identification of the existence of features at different spatial scales, particularly distinguishing damage from microstructural inhomogeneities.https://www.mdpi.com/2076-3417/11/18/8631slow dynamicsmultirelaxation processgrainsmetal alloys |
| spellingShingle | Jan Kober Alena Kruisova Marco Scalerandi Elastic Slow Dynamics in Polycrystalline Metal Alloys Applied Sciences slow dynamics multirelaxation process grains metal alloys |
| title | Elastic Slow Dynamics in Polycrystalline Metal Alloys |
| title_full | Elastic Slow Dynamics in Polycrystalline Metal Alloys |
| title_fullStr | Elastic Slow Dynamics in Polycrystalline Metal Alloys |
| title_full_unstemmed | Elastic Slow Dynamics in Polycrystalline Metal Alloys |
| title_short | Elastic Slow Dynamics in Polycrystalline Metal Alloys |
| title_sort | elastic slow dynamics in polycrystalline metal alloys |
| topic | slow dynamics multirelaxation process grains metal alloys |
| url | https://www.mdpi.com/2076-3417/11/18/8631 |
| work_keys_str_mv | AT jankober elasticslowdynamicsinpolycrystallinemetalalloys AT alenakruisova elasticslowdynamicsinpolycrystallinemetalalloys AT marcoscalerandi elasticslowdynamicsinpolycrystallinemetalalloys |