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Open AccessArticle

Dissolution and Precipitation Behavior for Hot Forming of 7021 and 7075 Aluminum Alloys

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Chair of Materials Science, Faculty of Mechanical Engineering and Marine Technology, University of Rostock, Albert-Einstein-Str. 2, 18059 Rostock, Germany
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Competence Center °CALOR, Department Life, Light &Matter, Faculty of Interdisciplinary Research, University of Rostock, Albert-Einstein-Str. 25, 18059 Rostock, Germany
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Light Metals Technologies Ranshofen, Austrian Institute of Technology, Lamprechtshausener Str. 61, P.O. Box 26, 5282 Ranshofen, Austria
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Magna Steyr AG & Co KG, Liebenauer Hauptstraße 317, 8041 Graz, Austria
*
Author to whom correspondence should be addressed.
Metals 2018, 8(7), 531; https://doi.org/10.3390/met8070531
Received: 29 May 2018 / Revised: 12 June 2018 / Accepted: 22 June 2018 / Published: 9 July 2018
(This article belongs to the Special Issue Heat Treatment of Aluminum Alloys)
Due to their high strength, 7xxx aluminum sheets are increasingly used for structural automobile components. One of the major challenges is the formability of these alloys during the production process while retaining high strengths in service. One promising method is forming at elevated temperatures directly after solution annealing; this is known as hot forming. However, this thermomechanical process requires a detailed comprehension of the dissolution and precipitation behavior during heating, solution annealing, and subsequent combination of forming and cooling processes. Therefore, the kinetics of solid-solid phase transformations during continuous heating and continuous cooling of the aluminum alloys EN AW-7021 and EN AW-7075 were determined with differential scanning calorimetry and hardness testing. The suitable solution annealing conditions and the critical cooling rates were specified for both alloys and compared to the real hot forming processes. View Full-Text
Keywords: 7021; 7075; AlZnMg alloys; DSC; heat treatment parameter; solution temperature; hot forming 7021; 7075; AlZnMg alloys; DSC; heat treatment parameter; solution temperature; hot forming
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Milkereit, B.; Österreich, M.; Schuster, P.; Kirov, G.; Mukeli, E.; Kessler, O. Dissolution and Precipitation Behavior for Hot Forming of 7021 and 7075 Aluminum Alloys. Metals 2018, 8, 531.

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