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Asymmetric accumulative roll bonding of aluminium-titanium composite sheets

Ng, Hoi Pang ; Przybilla, Thomas ; Schmidt, Christian ; Lapovok, Rimma ; Orlov, Dmitry LU orcid ; Höppel, Heinz Werner and Göken, Mathias (2013) In Materials Science & Engineering: A 576. p.306-315
Abstract

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... (More)

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.

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author
; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Al-Ti, Asymmetric accumulative roll bonding, Diffusion, Mechanical properties, Transmission electron microscopy
in
Materials Science & Engineering: A
volume
576
pages
306 - 315
publisher
Elsevier
external identifiers
  • scopus:84877075055
ISSN
0921-5093
DOI
10.1016/j.msea.2013.04.027
language
English
LU publication?
no
id
4396f534-351c-4222-9a5b-52b41bff89fd
date added to LUP
2016-06-20 15:58:12
date last changed
2025-04-04 14:16:03
@article{4396f534-351c-4222-9a5b-52b41bff89fd,
  abstract     = {{<p>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 (d<sub>r</sub>) 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 d<sub>r</sub>. 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. d<sub>r</sub>=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.</p>}},
  author       = {{Ng, Hoi Pang and Przybilla, Thomas and Schmidt, Christian and Lapovok, Rimma and Orlov, Dmitry and Höppel, Heinz Werner and Göken, Mathias}},
  issn         = {{0921-5093}},
  keywords     = {{Al-Ti; Asymmetric accumulative roll bonding; Diffusion; Mechanical properties; Transmission electron microscopy}},
  language     = {{eng}},
  month        = {{08}},
  pages        = {{306--315}},
  publisher    = {{Elsevier}},
  series       = {{Materials Science & Engineering: A}},
  title        = {{Asymmetric accumulative roll bonding of aluminium-titanium composite sheets}},
  url          = {{http://dx.doi.org/10.1016/j.msea.2013.04.027}},
  doi          = {{10.1016/j.msea.2013.04.027}},
  volume       = {{576}},
  year         = {{2013}},
}