Elastic Slow Dynamics in Polycrystalline Metal Alloys

0547948 - ÚT 2022 RIV CH eng J - Článek v odborném periodiku
Kober, Jan - Kruisová, Alena - Scalerandi, M.
Elastic Slow Dynamics in Polycrystalline Metal Alloys.
Applied Sciences-Basel. Roč. 11, č. 18 (2021), č. článku 8631. E-ISSN 2076-3417
Grant CEP: GA MŠMT(CZ) EF15_003/0000493; GA ČR(CZ) GA19-14237S
Institucionální podpora: RVO:61388998
Klíčová slova: slow dynamics * multirelaxation process * grains
Obor OECD: Materials engineering
Impakt faktor: 2.838, rok: 2021
Způsob publikování: Open access
https://www.mdpi.com/2076-3417/11/18/8631

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 10(-7) 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.
Trvalý link: http://hdl.handle.net/11104/0327206