Microstructure analysis of hybrid aluminum parts from recycled EN AW-6082 and EN AW-7075 chips

authored by: Jonathan Ursinus, Alexander Koch, Kai Brunotte, Frank Walther, Bernd Arno Behrens
Abstract: In order to promote aluminum scrap recycling and reduce remelting losses, solid-state recycling processes are subject to increasing academic attention. These processes range from severe plastic deformation (SPD) to diffusion-based processes like field-assisted sintering (FAST). In this study, a FAST-based recycling route consisting of precompaction, FAST, and impact extrusion of dry machined EN AW-6082 and EN AW-7075 aluminum chips was used to create multi-material parts from different aluminum alloys. To examine the effect on the resulting part quality, two different hybrid material layouts were created during cold compaction of the chips. The subsequent sintering process took place in a field-assisted sintering (FAST) machine at 400°C and 500°C for a duration of 5 min under a pressure of 85 MPa, allowing for the analysis of inter-chip diffusion. These sintered blanks were then cold-formed by impact extrusion. Metallographic and computed tomography analyses as well as hardness measurements were performed for property evaluation before and after heat-treatment.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
External Organisation(s): TU Dortmund University
Type: Conference contribution
Pages: 1977-1986
No. of pages: 10
Publication date: 19.04.2023
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Materials Science
Electronic version(s): https://doi.org/10.21741/9781644902479-213 (Access: Open)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{f90fcfb630814beaae94d9234eda488d,
title = "Microstructure analysis of hybrid aluminum parts from recycled EN AW-6082 and EN AW-7075 chips",
abstract = "In order to promote aluminum scrap recycling and reduce remelting losses, solid-state recycling processes are subject to increasing academic attention. These processes range from severe plastic deformation (SPD) to diffusion-based processes like field-assisted sintering (FAST). In this study, a FAST-based recycling route consisting of precompaction, FAST, and impact extrusion of dry machined EN AW-6082 and EN AW-7075 aluminum chips was used to create multi-material parts from different aluminum alloys. To examine the effect on the resulting part quality, two different hybrid material layouts were created during cold compaction of the chips. The subsequent sintering process took place in a field-assisted sintering (FAST) machine at 400°C and 500°C for a duration of 5 min under a pressure of 85 MPa, allowing for the analysis of inter-chip diffusion. These sintered blanks were then cold-formed by impact extrusion. Metallographic and computed tomography analyses as well as hardness measurements were performed for property evaluation before and after heat-treatment.",
keywords = "Aluminum, Chips, Extrusion, FAST, Hybrid Materials, Recycling",
author = "Jonathan Ursinus and Alexander Koch and Kai Brunotte and Frank Walther and Behrens, {Bernd Arno}",
note = "Funding Information: The results presented were obtained in the project “Mechanism-based characterization and evaluation of the performance of resistively sintered semi-finished products based on recycled aluminum chips”, project no. 454199925. The authors thank the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) for their financial support.; 26th International ESAFORM Conference on Material Forming, ESAFORM 2023 ; Conference date: 19-04-2023 Through 21-04-2023",
year = "2023",
month = apr,
day = "19",
doi = "10.21741/9781644902479-213",
language = "English",
isbn = "9781644902462",
series = "Materials Research Proceedings",
publisher = "Association of American Publishers",
pages = "1977--1986",
editor = "Lukasz Madej and Mateusz Sitko and Konrad Perzynsk",
booktitle = "Material Forming",
}