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Asymmetric accumulative roll bonding of aluminium-titanium composite sheets
journal contribution
posted on 2013-08-01, 00:00 authored by H P Ng, T Przybilla, C Schmidt, Rimma LapovokRimma Lapovok, D Orlov, H W Höppel, M GökenAluminium-titanium (Al/Ti) composite sheets were fabricated via asymmetric accumulative roll bonding (AARB), which capitalises on additional shear to enhance plastic deformation. Multi-layers of Al alloy (AA1050) and commercially-pure Ti sheets were alternatively stacked and rolled-bonded with varied roll diameter ratios (dr) ranging from 1 to 2, for up to four passes. Annealing of selected composite sheets was subsequently carried out at 600°C for 24h to compare the rates of solid-state diffusion reactions between Al and Ti components. Mechanical tests revealed that both tensile strength and ductility of the sheets increase systematically with dr. The microstructures and the Al/Ti interfaces of the sheets were analysed in detail using TEM, SEM and FIB techniques. It is shown that not only does AARB lead to a more refined grain size of the Al matrix but also it promotes the development of a nanostructured surface layer on Ti that comprises crystallites of 50-100nm in size, which is otherwise absent in the case of symmetric ARB (i.e. dr=1). The AARB-processed sheets exhibit a larger thickness of the interdiffusion layer at the Al/Ti interfaces than the counterparts processed via the symmetric ARB route, the difference being in excess of 15%. The effects and the implications of AARB processing on mechanical behaviour and diffusion kinetics are discussed with respect to the microstructural evolutions.
History
Journal
Materials science and engineering AVolume
576Pagination
306 - 315Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0921-5093Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2013, Elsevier B.V.Usage metrics
Keywords
Al-Tiasymmetric accumulative roll bondingtransmission electron microscopymechanical propertiesdiffusionScience & TechnologyTechnologyNanoscience & NanotechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringScience & Technology - Other TopicsMaterials ScienceMECHANICAL-PROPERTIESSOLID-SOLUTIONSR-VALUETEXTUREDEFORMATIONEVOLUTIONMICROSTRUCTUREPRESSURESYSTEMMechanical Engineering
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