Facing the Issues of Sheet Metal Equal‐Channel Angular Pressing: A Modified Approach Using Stacks to Produce Ultrafine‐Grained High Ductility AA5083 Sheets

Illgen, Christian; Bohne, Benjamin; Wagner, Martin F.‐X.; Gruber, Maximilian; Volk, Wolfram; Frint, Philipp

doi:10.1002/adem.202100244

Cited by 2 publications

(1 citation statement)

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“…In a previous study on the ECAP material state of the same alloy, a recrystallization temperature of 310 °C was determined by DSC measurements (route C, four passes, equivalent plastic strain per pass ~1.15) [16]. Although higher plastic deformations were present in these investigations and the shear was performed in a different sheet plane, the measured temperature value is used as a reference value since the same material of the same batch was also used in this paper.…”

Section: Figure 3: Specimen Geometries For the Flc Testsmentioning

confidence: 99%

A Novel Method for the Determination of High Temperature FLCs of ECAP-Processed Aluminum AA5083 Sheet Metal

Gruber

Leitner

Auer

et al. 2022

KEM

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In this study, investigations into the deformation behavior of aluminum AA5083 at elevated temperatures were carried out on a newly developed test rig. The test rig was developed jointly with ZwickRoell GmbH & Co. KG (Germany) and is based on a Nakajima test carried out with heated dies. In this way, statements can be made about the lightweight potential of the alloy. Additionally, equal-channel angular pressing (ECAP) was performed to process the aluminum sheet metal. The conventional ECAP process is mainly used for bulk material in laboratory use and therefore is often not suitable for many industrial applications, especially for large series. The use of sheet metal allows a significant increase in the areas of application. It is documented in conventional ECAP that grain refinement is achieved by the severe plastic deformation. At room temperature this primarily increases the mechanical strength. Formability is improved in fine-grained materials, especially at elevated temperatures, which is related to diffusion-controlled deformation mechanisms and grain boundary sliding. The advantages of ECAP for sheet materials are thus also in lightweight construction and can even optimize the use of the AA5083 alloy. ECAP-route C was used for the process to provide the most homogeneous microstructure possible (180° rotation around the ECAP-axis after the first pass). Nakajima specimens were taken from the processed sheet materials to determine the Forming Limit Curve (FLC) compared to the reference material (four different specimen geometries). FLCs under elevated temperatures (250 °C, 375 °C) were performed on the novel Nakajima test bench. A special feature of the test rig is the rapid heating to avoid microstructural changes. Microscopic examinations were performed after the deformation to study the deformation mechanisms. Differences of the forming and fracture mechanisms between the reference alloy and the ECAP material were found.

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Section: Figure 3: Specimen Geometries For the Flc Testsmentioning

confidence: 99%