Peculiar serrated flow during compression of an FeAlCrMo medium-entropy alloy
| Autor: | Pavel Lukáč, Peter Minárik, Robert Král, Michal Knapek, Josef Pešička |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy Metals and Alloys 02 engineering and technology Mechanics engineering.material Strain rate 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic units Acoustic emission Mechanics of Materials 0103 physical sciences engineering Entropy (information theory) General Materials Science 0210 nano-technology Dynamic strain aging |
| Zdroj: | Scripta Materialia. 161:49-53 |
| ISSN: | 1359-6462 |
| DOI: | 10.1016/j.scriptamat.2018.10.013 |
| Popis: | This letter presents a systematic study of serrated flow of the FeAlCrMo medium-entropy alloy in compression, first observed at 400 °C and a strain rate of ~10−4 s−1. In this work, these parameters were varied in order to evaluate how they affect the deformation behavior. Compression curves together with the acoustic emission data suggest that dynamic strain aging (the Portevin-Le Châtelier effect) is responsible for the jerky flow. Furthermore, at certain conditions, peculiar periodic serrations appeared, which possessed bimodal distribution of drop magnitudes. In this multicomponent material, this effect likely originates in complex dislocation-solutes interactions at the atomic scale. |
| Databáze: | OpenAIRE |
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