Papers by Author: Jürgen Hirsch

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Authors: Manfred Schneider, Günter Gottstein, L. Löchte, Jürgen Hirsch
Authors: Dierk Raabe, Kurt Helming, Franz Roters, Zisu Zhao, Jürgen Hirsch
Authors: Jürgen Hirsch, Kai F. Karhausen, L. Löchte
Authors: Jürgen Hirsch, Günter Gottstein, Markus Büscher, Christian Leroy, Andrew Green
Authors: Jürgen Hirsch, Christian Leroy, Andrew Green
Abstract: The web-based e-learning tool “AluMATTER” is presented which can be accessed under the address “” and offers a new interactive course for students, engineers or technicians to learn all about Aluminium science and technologies. The e-learning program fulfils all distant learning requirements and intends to supplement regular teaching courses. It allows users to access the material in a context relevant to their own requirements and background.
Authors: Jürgen Hirsch
Authors: Jürgen Hirsch, Pascal Wagner, H. Schmiedel
Authors: Richard H. Kemsies, Benjamin Milkereit, Olaf Kessler, Torsten Fuhrmann, Stephan Schlegel, Falk Plonus, Simon Peter Miller-Jupp, Jürgen Hirsch
Abstract: In electrical power systems bolted joints with bus bars made of aluminium are common, whereby the tendency towards higher operating temperatures can be observed. At higher temperatures a reduction of the joint force can occur due to creep and/or stress relaxation processes, which leads to an increasing electrical resistance and, in the worst case, to failed joints. The aim of this project is to increase the creep resistance (and to minimise the stress relaxation) of aluminium conductors for electrical applications without a significant reduction in their electrical conductivity – even after long-term exposure to elevated temperatures. The effect of dispersoids in different aluminium alloys on the longterm behaviour of currentcarrying joints at high temperatures (i.e. 140 °C) was investigated. Longterm tests on bolted joints with force measuring devices were performed to monitor the joint forces and to measure the joint resistances, both with and without current supply.
Authors: Olaf Engler, A. Chavooshi, Jürgen Hirsch, Günter Gottstein
Authors: Jürgen Hirsch
Abstract: The effect of plastic deformation of Aluminium alloys at elevated temperatures is described and its effects on texture evolution in Aluminium and its alloys. The softening mechanisms involved are recovery, recrystallization and grain boundary sliding which reduce strain hardening and affect plastic deformation also in industrial fabrication and forming processes of Aluminium alloys, like (hot) forming, rolling, extrusion and superplastic forming. These effects that control high temperature formability and the resulting textures and final properties are described.
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