Asymmetric accumulative roll bonding of aluminium-titanium composite sheets

Ng, Hoi Pang, Przybilla, Thomas, Schmidt, Christian, Lapovok, Rimma, Orlov, Dmitry, Höppel, Heinz-Werner and Göken, Mathias 2013, Asymmetric accumulative roll bonding of aluminium-titanium composite sheets, Materials science and engineering A, vol. 576, pp. 306-315, doi: 10.1016/j.msea.2013.04.027.

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Title Asymmetric accumulative roll bonding of aluminium-titanium composite sheets
Author(s) Ng, Hoi Pang
Przybilla, Thomas
Schmidt, Christian
Lapovok, RimmaORCID iD for Lapovok, Rimma
Orlov, Dmitry
Höppel, Heinz-Werner
Göken, Mathias
Journal name Materials science and engineering A
Volume number 576
Start page 306
End page 315
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2013-08-01
ISSN 0921-5093
Keyword(s) Al-Ti
asymmetric accumulative roll bonding
transmission electron microscopy
mechanical properties
Summary Aluminium-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.
Language eng
DOI 10.1016/j.msea.2013.04.027
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, Elsevier B.V.
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Document type: Journal Article
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