Al‐Al‐Verbundguss – Technologische Grundlagen und werkstoffkundliche Charakterisierung der stofflichen Anbindung von Aluminiumknetlegierungen im Aluminium‐Druckguss

Al-Al-Compound Casting – Technological fundamentals and material characterization of metallic bonding with aluminum wrought inserts during aluminum high pressure die casting

  • Als Verbundguss wird eine gießtechnische Fertigungsmöglichkeit bezeichnet um metallische Gussstücke mit speziellem Eigenschaftsprofil her zu stellen. Im Rahmen der vorgestellten Dissertation werden Bleche verschiedener Aluminiumknetlegierungen (breites Spektrum an mechanischen Eigenschaften) mit Aluminiumgusslegierungen (hohe Gestaltungsfreiheit) erfolgreich auf rein stoffschlüssiger Basis verbunden. Schlüsseltechnologien stellen zum einen das Kaltkammer-Druckgussverfahren und zum anderen das Zinkatverfahren als Oberflächen-aktivierende Vorbehandlung der Bleche dar. Insbesondere in Kombination mit einer Wärmebehandlung der Verbunde werden unter speziellen Lastverhältnissen deutliche VerbesseAls Verbundguss wird eine gießtechnische Fertigungsmöglichkeit bezeichnet um metallische Gussstücke mit speziellem Eigenschaftsprofil her zu stellen. Im Rahmen der vorgestellten Dissertation werden Bleche verschiedener Aluminiumknetlegierungen (breites Spektrum an mechanischen Eigenschaften) mit Aluminiumgusslegierungen (hohe Gestaltungsfreiheit) erfolgreich auf rein stoffschlüssiger Basis verbunden. Schlüsseltechnologien stellen zum einen das Kaltkammer-Druckgussverfahren und zum anderen das Zinkatverfahren als Oberflächen-aktivierende Vorbehandlung der Bleche dar. Insbesondere in Kombination mit einer Wärmebehandlung der Verbunde werden unter speziellen Lastverhältnissen deutliche Verbesserungen der mechanischen Eigenschaften erzielt.show moreshow less
  • The application and combination of different materials is motivated by high complexity and high functionality of modern technical assemblies. This approach is also known as “mixed construction” for optimized lightweight products and involves a deep analysis of the interface/joint between the different parts. Therefore the interface between the solid insert and the casting component is of great interest besides controlling and adapting the casting process. The connection between the individual parts can be realized with form closure, traction or metallic bonding. The connection between the compound partners in this work is realized solely based on metallic bonding. Compound castings made of aThe application and combination of different materials is motivated by high complexity and high functionality of modern technical assemblies. This approach is also known as “mixed construction” for optimized lightweight products and involves a deep analysis of the interface/joint between the different parts. Therefore the interface between the solid insert and the casting component is of great interest besides controlling and adapting the casting process. The connection between the individual parts can be realized with form closure, traction or metallic bonding. The connection between the compound partners in this work is realized solely based on metallic bonding. Compound castings made of aluminum wrought alloys and aluminum cast alloys are created. In order to manufacture this kind of connection, the first part is focused on the surface pretreatment and coating technologies for solid Al-Inserts. A special coating process – zincate treatment – is applied in order to activate the insert surface and prevent reoxidation by depositing a thin layer of zinc. Subsequently the production of the compounds starts by using standard cold chamber high pressure die casting technology. A process window is determined and the investigations are supported by numerical calculations for mold filling behavior and solidification. 3 Point-Bending tests and compression shear experiments provide the means for mechanical characterization. In combination with an analytical observation of the interface, a profound understanding between process parameters, compound properties and the mechanism for the interface evolution is the aim of the second part of this work. Furthermore, an import goal can be found in the third part. Via adapted heat treatments the Al-Al-compounds shall be optimized. An improved strength for the cast and wrought alloy sections as well as a dissolution and distribution of zinc to the surrounding Al-matrices is striven. An adapted heat treatment leads to an overall improved compound cohesion and optimized mechanical properties. From the six most used groups of aluminum wrought alloys, 1 mm thick sheets are chosen to be coated with the zincate treatment and show a high coating degree as well as a satisfying adhesive strength. For casting thicknesses of 4 to 6 mm compounds with a defined strength are successfully produced. In general, the casting parameters show a minor influence on the compound properties. Whereas heat treatment leads to strongly improved formability and maximal loads at the point of break in the 3-Point-Bending experiments. A most interesting discussion forms around the topic of interface reactions: A combination of diffusion in the solid, in the liquid and convective effects is responsible for the development of metallic bonding. show moreshow less

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Metadaten
Author:Matthias Schwankl
URN:urn:nbn:de:bvb:29-opus4-86242
ISBN:978-3-96147-049-5
Series (Volume number):FAU Studien Materialwissenschaft und Werkstofftechnik (15)
Publisher:FAU University Press
Place of publication:Erlangen
Advisor:Carolin Körner, Peter J. Uggowitzer
Document Type:Doctoral Thesis
Language:German
Year of Completion:2017
Embargo Date:2017/07/05
Publishing Institution:FAU University Press
Granting Institution:Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Technische Fakultät
Date of final exam:2016/12/02
Release Date:2017/07/06
Tag:Al-Al-Verbundguss; Diffusionszone ; Insert; Oberflächenaktivierung; Reaktionszone; Zinkatverfahren
SWD-Keyword:Aluminium; Druckguss; Galvanische Beschichtung ; Metallischer Werkstoff; Oxidschicht; Verbundguss
Pagenumber:xii, 177 S.
Note:
Parallel erschienen als Druckausgabe bei FAU University Press, ISBN: 978-3-96147-048-8
Institutes:Technische Fakultät / Department Werkstoffwissenschaften
Dewey Decimal Classification:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
open_access (DINI-Set):open_access
Collections:Universität Erlangen-Nürnberg / FAU University Press
Licence (German):Creative Commons - Namensnennung-NichtKommerziell-KeineBearbeitung

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