Asymmetric accumulative roll bonding of aluminium-titanium composite sheets

Hoi Pang Ng , Przybilla T, Schmidt C, Lapovok R, Orlov D, Höppel HW, Göken M (2013)


Publication Type: Journal article

Publication year: 2013

Journal

Book Volume: 576

Pages Range: 306-315

DOI: 10.1016/j.msea.2013.04.027

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 24 h 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--100 nm 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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APA:

Hoi Pang Ng, ., Przybilla, T., Schmidt, C., Lapovok, R., Orlov, D., Höppel, H.W., & Göken, M. (2013). Asymmetric accumulative roll bonding of aluminium-titanium composite sheets. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 576, 306-315. https://doi.org/10.1016/j.msea.2013.04.027

MLA:

Hoi Pang Ng, , et al. "Asymmetric accumulative roll bonding of aluminium-titanium composite sheets." Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing 576 (2013): 306-315.

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