Reduction of anisotropy and the SDE of magnesium profiles by means of a specific process control of the extrusion process
Mechanical Properties of Metallic Materials and their Microstructural Origins
Final Report Abstract
The mechanical properties of metallic materials are generally determined by the microstructure. In hexagonal metals such as magnesium, twinning plays a particularly important role. The anisotropic distribution of activatable twinning systems in combination with preferential orientation, for example after extrusion, leads to the so-called Strength Differential Effect (SDE). For structural components, a low SDE is aimed for in order to obtain the most isotropic component behavior possible. The activation of twin systems becomes more difficult with decreasing grain size, so that it can be a desired goal to keep the grain size small. The so-called ECAP (Equal Angular Channel Pressing) method is suitable for this purpose, for example. On the one hand, in this project, the two forming steps ECAP and extrusion were combined in one die and thus in one production step. In the combined ECAP extrusion die developed, double shearing takes place immediately after the actual extrusion process, so that the original extrusion direction is finally achieved again. Secondly, forging was used to introduce performing into the extrusion billets. To evaluate the effectiveness of the new process route, the samples extruded by means of the combined die were analyzed with regard to their grain size, texture and mechanical properties.
Publications
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Modification of the anisotropy and strength differential effect of extruded AZ31 by extrusion-shear. AIP Conference Proceedings, 1960, 030008. Author(s).
Jaehnke, M.; Gensch, F. & Mueller, S.
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Visualization of Material Flow during Magnesium Extrusion, Proceeding of the 11th International Conference on Magnesium Alloys and Their Applications, (2018), 220-225
Jaehnke, M., Apel, H. & Mueller, S.
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Application of Friction Shear Test for Constitutive Modeling Evaluation of Magnesium Alloy AZ31B at high Temperature. Procedia Manufacturing, 47, 237-244.
Sanabria, Vidal; Gensch, Felix & Mueller, Soeren
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Patent Nr. EP 4 011 515 A1, Verfahren und Vorrichtung zum koaxialen Strangpressen eines Strangpressprodukts, angemeldet am 11.12.2020, veröffentlicht am 15.06.2022
Müller, S., Nitschke, R., Gall, S. & Gensch, F.
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Influence of Preforging in Extrusion as Well as in Equal Channel Angular Pressing in EXtrusion (ECAPEX) on the Properties of Magnesium Rods. The Minerals, Metals & Materials Series, 111-118. Springer Nature Switzerland.
Nitschke, René & Mueller, Sören
