Gradation Rolling – Technology for graded ultrafine‐grained materials

Neugebauer, Reimund; Sterzing, Andreas; Bergmann, Markus

doi:10.1002/mawe.201000658

Cited by 3 publications

(2 citation statements)

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“…Optimized components with a combination of high strength, high cycle fatigue and good corrosion resistance are possible by using graded billets in forming process chains. gradation rolling is an incremental forming technology for the generation of a graded grain size and thus graded properties [2,3,16]. Compared to known technologies like SMAT the thickness of the ultrafine-grained layer is extended up to several mm.…”

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confidence: 99%

“…The new technology, referred to as gradation rolling, is applied for the efficient manufacturing of rod shaped parts with locally different grain sizes. After the presentation of the process principle [1], the characterization of the microstructure [2] and the identification of deformation routes during processing [3] the first mechanical characterization of a wrought aluminium alloy is presented. The resulting mechanical properties in different regions of a graded material are analyzed by hardness measurements and tensile tests.…”

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Mechanical properties of the AlSi1MgMn aluminium alloy (AA6082) processed by gradation rolling

Neugebauer

Sterzing

Bergmann³

2011

Materialwissenschaft Werkst

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An outstanding approach for the tailoring of material properties is the grain refinement by the application of very high strains with changing strain path. Methods of severe plastic deformation (SPD) can create ultrafine-grained or nanostructured metallic materials with new combinations of physical and mechanical properties. Classical SPD methods focus typically on the uniform modification of the microstructure throughout the complete volume. In the present study the processing and subsequent characterisation of an age hardenable aluminium alloy subjected to a partial severe plastic deformation is presented. The new technology, referred to as gradation rolling, is applied for the efficient manufacturing of rod shaped parts with locally different grain sizes. After the presentation of the process principle [1], the characterization of the microstructure [2] and the identification of deformation routes during processing [3] the first mechanical characterization of a wrought aluminium alloy is presented. The resulting mechanical properties in different regions of a graded material are analyzed by hardness measurements and tensile tests. The mechanical parameters of the graded billets show the typical characteristics of coarse grained material in the core region and that of severely deformed material in the kneaded region at the surface of the billets

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Mechanical properties of the AlSi1MgMn aluminium alloy (AA6082) processed by gradation rolling

Neugebauer

Sterzing

Bergmann³

2011

Materialwissenschaft Werkst

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Effect of different grain sizes and textures on the corrosion behaviour of aluminum alloy AA6082

Händel

Nickel

Lampke

2011

Materialwissenschaft Werkst

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Effect of different grain sizes and textures on the corrosion behaviour of aluminum alloy AA6082Einfluss unterschiedlicher Korngrößen und Texturen auf das Korrosionsverhalten der Aluminiumlegierung EN AW-6082The fabrication and processing of aluminum alloys can result in the formation of different grain sizes and textures within the material. The effects of these differences on the corrosion behaviour of the commercially available alloy AA6082 have been investigated. The results of the macro-and microelectrochemical investigations have been compared with each other and with the resulting corrosion appearance. The observed corrosion damage is not always consistent with the measured corrosion and pitting potential. In the finer-grained part, with a strongly preferred orientation of (002) planes parallel to the sample surface, less corrosion damage could be observed than in the coarser-grained part. However, microelectrochemical measurements show a slightly lower pitting potential in the finer-grained part, so that pitting is likely to start earlier in this area.Keywords: aluminum alloy AA6082 / corrosion / microelectrochemistry / grain sizes / texture / Durch Herstellung und Verarbeitung von Aluminiumlegierungen werden Korngröße und Textur beeinflusst. Die Auswirkungen dieser Unterschiede auf das elektrochemische Korrosionsverhalten der kommerziell erhältlichen Legierung EN AW-6082 wurden untersucht. Die Ergebnisse der makro-und mikroelektrochemischen Untersuchungen werden gegenübergestellt und mit den resultierenden Korrosionserscheinungen verglichen. Dabei zeigt sich, dass der beobachtete Korrosionsschaden nicht immer mit den gemessenen Korrosions-bzw. Lochfraßpotenzialen im Einklang steht. Im feinkörnigeren Bereich mit einer starken Vorzugsorientierung der (002)-Netzebenen parallel zur Probenoberfläche finden sich geringere Korrosionsschäden als im grobkörnige-ren Bereich. Allerdings zeigen mikroelektrochemische Messungen ein etwas niedrigeres Lochfraßpotenzial für den feinkörnigeren Bereich, was auf früher einsetzende Lochkorrosion hindeutet.Schlüsselwörter: Aluminiumlegierung EN AW-6082 / Korrosion / Mikroelektrochemie / Korngrößen / Textur /

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Controlled grain size distribution and refinement of an EN AW-6082 aluminium alloy

Lampke

Dietrich

Nickel

et al. 2011

International Journal of Materials Research

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An EN AW-6082 aluminium alloy was subjected to an incremental deformation by a new process named gradation rolling. The process is used to generate a grain size distribution in a rod shaped billet. A gradient of the grain size from coarse grained to ultrafine grained size is obtained by gradation rolling. The microstructure shows an increasing grain refinement related to the true strain. This results in strain-hardening and grain-boundary strengthening in the surface region (130 HV0.5). as compared to the unchanged core (110 HV0.5)

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Gradation Rolling – Technology for graded ultrafine‐grained materials

Cited by 3 publications

References 14 publications

Mechanical properties of the AlSi1MgMn aluminium alloy (AA6082) processed by gradation rolling

Mechanical properties of the AlSi1MgMn aluminium alloy (AA6082) processed by gradation rolling

Effect of different grain sizes and textures on the corrosion behaviour of aluminum alloy AA6082

Controlled grain size distribution and refinement of an EN AW-6082 aluminium alloy

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