Numerische und experimentelle Untersuchungen zur Herstellung von stranggepressten Aluminium/Magnesium‐Werkstoffverbunden und zur Festigkeit des Interface

Kittner, Kristina; Awiszus, Birgit; Lehmann, T; Stockmann, Martin; Naumann, J.

doi:10.1002/mawe.200900487

Cited by 17 publications

(10 citation statements)

References 5 publications

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“…The variety of bending tests, which was performed to determine the interface strength, is not included in this paper. These results can be seen in [8,12,13]. The deformation analysis by DIC was applied at high temperatures.…”

Section: Bending Testmentioning

confidence: 82%

Digital Image Correlation Used for Experimental Investigations of Al/Mg Compounds

Kirbach

Lehmann

Stockmann

et al. 2015

Strain

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Al/Mg compounds produced by hydrostatic extrusion exhibit unique characteristics in terms of high strength and low weight, which are required in lightweight safety parts. The compound interface between the core and sleeve is a brittle intermetallic phase consisting of Al 2 Mg 3 and Al 12 Mg 17 . However, a certain plastic deformability is required for subsequent processing of the semi-finished product by forming. To obtain a basic understanding of the deformation behaviour of the interface, the Digital Image Correlation is used together with a new analysis procedure based on the approximation of the displacement field with polynomial functions. The procedure is first tested with a bending test. The specimens exhibit a remarkable deformation behaviour under bending at high temperatures, which is confirmed by the results of radial upsetting tests. Even under a multi-axle load, the interface maintains a full material joint, though fragmentation occurs, and a new secondary interface between the fragments can be observed. In addition, an evaluation of light microscopy images and Eulerian Hencky strain values at the interface, which are based on the Digital Image Correlation results, imply a connection between the strain and the boundary layer's appearance.

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Section: Bending Testmentioning

confidence: 82%

Digital Image Correlation Used for Experimental Investigations of Al/Mg Compounds

Kirbach

Lehmann

Stockmann

et al. 2015

Strain

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“…Der für den Plattiererfolg notwendige Stofftransport über die Phasengrenzen hinaus ist in der Regel nur dann möglich, wenn das vorliegende Legierungssystem eine Mischkristallreihe aufweist. Diese grundlegende metallurgische Forderung ist bei der Kombination von Magnesium mit Aluminium gegeben 4 . In der Literatur angeführte Beispiele für diese Werkstoffpaarung weisen immer die kubischraumzentrierte Al 12 Mg 17 -und die kubischflächenzentrierte Al 3 Mg 2 -Phase in der Bindezone auf 4,19,25 .…”

Section: Walzplattierenunclassified

Herstellung und Umformbarkeit walzplattierter Magnesium(AZ31)-Aluminium(1050)-Verbunde

Schlögl

Planitzer

Harrer

et al. 2011

Berg Huettenmaenn Monatsh

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Eine Optimierungsmöglichkeit im Zusammenfassung: stofflichen Leichtbau liegt im Austausch des gängigen Werkstoffes Aluminium mit dem um rund 30 % leichteren Magnesium. Dabei stellt die hohe Korrosionsneigung des Magnesiums die größte Problematik dar. Ein möglicher Lö-sungsansatz ist das in dieser Arbeit behandelte Walzplattieren mit dünnen, korrosionsbeständigen Aluminiumblechen. Es wird die Herstellung des Mg(AZ31)-Al(1050)-Verbundes erläutert, wobei der Fokus auf der Verarbeitbarkeit des hexagonal aufgebauten Magnesiums liegt. Ergebnisse aus Warmwalzversuchen ermöglichen es, optimierte Plattierparameter für den Umformprozess festzulegen. Technologische Werkstoffprüfverfahren zur Bestimmung der Haftfestigkeit und des Umformvermögens (z. B. Schälversuche) zeigen, dass unter den ermittelten Bedingungen feste, gut verformbare Werkstoffverbunde entstehen. Production and Formability of Roll Bounded Magnesium(AZ31)-Aluminium(1050)-CompositesA possibility to reduce weight in lightweight conAbstract: structions is the usage of magnesium instead of the typically used leight-weight material aluminium. Magnesium is more than 30 % lighter than aluminium. However, the biggest problem of magnesium is the bad corrosion behaviour. One approach of corrosion protection is coating with aluminium by roll-bounding. This paper gives an introduction into the assembly process of roll bounded Mg(AZ31)-Al(1050) composites and a parameter optimisation by analysing the adhesion. An explanation of the testing methods is also given. Abb. 1: Gleitebenen in Magnesium (hexagonale Kristallstruktur) 8 Damit ein Werkstoffverbund den Sprung aus der akademischen Forschung in die kommerzielle Anwendung schafft, ist neben einer ökonomischen Fertigung auch die spätere Korrespondenzautor:

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“…Investigations with bending tests regarding the determination of the interfacial strength were performed in a wide temperature range from room temperature up to 400 • C [6,[17][18][19]. The loading condition and the specimen shape are designed such that failure occurs under a tensile normal stress.…”

Section: Introductionmentioning

confidence: 99%

A Fragmentation Criterion for the Interface of a Hydrostatic Extruded Al-Mg-Compound

Kirbach

Stockmann

Ihlemann

2018

Metals

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Due to the higher demand for energy efficient products, light-weight constructions have become more important in recent years. An innovative, hydrostatic extruded Al-Mg-compound used here combines the corrosion resistance of aluminium with the outstanding lightweight properties of magnesium. During the production process, a thin boundary layer is built between the two basic materials. Investigations on further hot forming processing revealed a good formability of these compounds despite the fact that the boundary layer splits into fragments during forging and a new secondary boundary layer is built when the basic materials between the fragments come into contact again during the continuous deformation. The aim of the research is now to investigate fragmentation depending on the deformation rate and boundary layer thickness, which increases during the heat-up process in preparation of forging. For this purpose, a channel compression test is used in conjunction with a special newly developed specimen shape. The metallographic evaluation of the boundary layer reveals a strong dependency of fragmentation on the deformation rate and the boundary layer thickness. With the aid of a numerical simulation, an individual critical stretch could be determined at which fragmentation starts, and provide guidance for an optimal forging process design.

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Numerische und experimentelle Untersuchungen zur Herstellung von stranggepressten Aluminium/Magnesium‐Werkstoffverbunden und zur Festigkeit des Interface

Cited by 17 publications

References 5 publications

Digital Image Correlation Used for Experimental Investigations of Al/Mg Compounds

Digital Image Correlation Used for Experimental Investigations of Al/Mg Compounds

Herstellung und Umformbarkeit walzplattierter Magnesium(AZ31)-Aluminium(1050)-Verbunde

A Fragmentation Criterion for the Interface of a Hydrostatic Extruded Al-Mg-Compound

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