Influences on the formability and mechanical properties of 7000-aluminum alloys in hot and warm forming

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Behrens, B.-A.; Nürnberger, F.; Bonk, C.; Hübner, S.; Behrens, S. et al.: Influences on the formability and mechanical properties of 7000-aluminum alloys in hot and warm forming. In: Journal of Physics: Conference Series 896 (2017), Nr. 1, 12004. DOI: https://doi.org/10.1088/1742-6596/896/1/012004

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Aluminum alloys of the 7000 series possess high lightweight potential due to their high specific tensile strength combined with a good ultimate elongation. For this reason, hot-formed boron-manganese-steel parts can be substituted by these alloys. Therefore, the application of these aluminum alloys for structural car body components is desired to decrease the weight of the body in white and consequently CO2 emissions during vehicle operation. These days, the limited formability at room temperature limits an application in the automobile industry. By increasing the deformation temperature, formability can be improved. In this study, two different approaches to increase the formability of these alloys by means of higher temperatures were investigated. The first approach is a warm forming route to form sheets in T6 temper state with high tensile strength at temperatures between 150 °C and 300 °C. The second approach is a hot forming route. Here, the material is annealed at solution heat treatment temperature and formed directly after the annealing step. Additionally, a quench step is included in the forming stage. After the forming and quenching step, the sheets have to be artificially aged to achieve the high specific tensile strength. In this study, several parameters in the presented process routes, which influence the formability and the mechanical properties, have been investigated for the aluminum alloys EN AW7022 and EN AW7075. © Published under licence by IOP Publishing Ltd.
Lizenzbestimmungen: CC BY 3.0 Unported
Publikationstyp: Article
Publikationsstatus: publishedVersion
Erstveröffentlichung: 2017
Die Publikation erscheint in Sammlung(en):Fakultät für Maschinenbau

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