| Autor: |
Wenwu Xu, Runjian Jiang, Mingjie Xu, Md Shahrier Hasan, Kyrel Polifrone, Jing Gu, Yang Yang, Elisa Torresani, Eugene Olevsky |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Materials Today Advances, Vol 20, Iss , Pp 100442- (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2590-0498 |
| DOI: |
10.1016/j.mtadv.2023.100442 |
| Popis: |
We report a novel electro-nano-pulsing (ENP) processing method to achieve localized engineering of grain boundary (GB) morphology in polycrystalline metallic materials. ENP is extraordinarily capable of generating intense nanopulse electric current with a current density greater than a few to several hundreds of 1010A/m2 and a pulse duration on the order of a few 100ns. Such a level of current density is ∼3–5 magnitudes higher than that is usually achieved during the Spark Plasma Sintering process. Using the Nichrome-80 superalloy as a model material, we observed a variety of GB roughening phenomena at multiple length scales, resulting in the generation of diverse forms of atomistic facets, nanoscale serrations, and nanoscale step-like GB morphologies after the ENP processing. We think that the excessive GB heat localization and electron wind force or stress are the main factors contributing to the GB morphological changes during the ENP processing. The ENP processing provides a new unique grain boundary engineering strategy to manipulate the GBs with the changes localized at the GB region, without altering its adjacent grains. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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