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

Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing Elsevier

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.

Authors with CRIS profile

Thomas Przybilla Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Christian Schmidt Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Heinz Werner Höppel Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

Layered Lightweight Composites and Graded Materials (EXC315 EAM (E3)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2012 - Oct. 31, 2017

Involved external institutions

Monash University AU Australia (AU)

How to cite

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://dx.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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