Electrical resistance-based fatigue assessment and capability prediction of extrudates from recycled field-assisted sintered EN AW-6082 aluminium chips

authored by: Alexander Koch, Martin Bonhage, Mirko Teschke, Lukas Luecker, Bernd Arno Behrens, Frank Walther
Abstract: The possibility to directly extrude semi-finished products using a solid-state-recycling process is a promising alternative to the remelting process, which is highly energy-intensive. Therefore, aluminium chips, normally considered as scrap, are used as the basis for the recycling. The recycling process consists of a cold compaction process, a field-assisted sintering (FAST) process to consolidate the chips, and finally a forward rod extrusion process. Compared to approaches which break the oxide layers by applying high shear stresses and deformations, necessary for an adequate welding of the chips, quasistatic and cyclic properties and capabilities are significantly increased. The defect structure of specimens, which was determined by means of computed tomography and which significantly influences the lifetime, could be correlated well with pre-test electrical resistance measurements. Finally, these findings were used to establish a lifetime calculation model based on unique electrical resistance measurements prior to mechanical testing.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
External Organisation(s): TU Dortmund University
Type: Article
Journal: Materials Characterization
Volume: 169
ISSN: 1044-5803
Publication date: 11.2020
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Materials Science, Condensed Matter Physics, Mechanics of Materials, Mechanical Engineering
Electronic version(s): https://doi.org/10.1016/j.matchar.2020.110644 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{0004fac587654f4391f39562714bc1d4,
title = "Electrical resistance-based fatigue assessment and capability prediction of extrudates from recycled field-assisted sintered EN AW-6082 aluminium chips",
abstract = "The possibility to directly extrude semi-finished products using a solid-state-recycling process is a promising alternative to the remelting process, which is highly energy-intensive. Therefore, aluminium chips, normally considered as scrap, are used as the basis for the recycling. The recycling process consists of a cold compaction process, a field-assisted sintering (FAST) process to consolidate the chips, and finally a forward rod extrusion process. Compared to approaches which break the oxide layers by applying high shear stresses and deformations, necessary for an adequate welding of the chips, quasistatic and cyclic properties and capabilities are significantly increased. The defect structure of specimens, which was determined by means of computed tomography and which significantly influences the lifetime, could be correlated well with pre-test electrical resistance measurements. Finally, these findings were used to establish a lifetime calculation model based on unique electrical resistance measurements prior to mechanical testing.",
keywords = "Computed tomography, Fatigue behaviour, Lifetime prediction, Resistance measurements, Solid-state-recycling",
author = "Alexander Koch and Martin Bonhage and Mirko Teschke and Lukas Luecker and Behrens, {Bernd Arno} and Frank Walther",
note = "Funding Information: The development of defect volume determination by electrical resistance measurements and experimental setup is funded by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) within the Collaborative Research Center CRC /Transregio 188 “Damage-Controlled Forming Processes” (subproject B01, project number 278868966 ).",
year = "2020",
month = nov,
doi = "10.1016/j.matchar.2020.110644",
language = "English",
volume = "169",
journal = "Materials Characterization",
issn = "1044-5803",
publisher = "Elsevier Inc.",
}