Microstructural evolution in the bonding zones of co-extruded aluminium / titanium

Significance Statement

The study „Microstructural evolution in the bonding zones of coextruded aluminum / titanium“ is a result of a recent collaboration between scientists from the Collaborative Research Center SFB 692 and from the Federal Cluster of Excellence MERGE at Technische Universität Chemnitz with researchers from Leibniz Universität Hannover.

The Collaborative Research Center SFB 692 – “High-strength aluminum-based lightweight materials for safety components (HALS)“ is focused on utilizing the potential of aluminum-based lightweight materials for structural components. Our research deals with the development, production, characterization and application of novel lightweight materials for safety-related parts and components. In three interactive fields of activity, different topics related to aluminum-based materials are investigated. The first major topic “high-strength Al wrought alloys” is focused on producing materials with very fine grains by equal-channel angular pressing (ECAP) as a method of severe plastic deformation (SPD). In the second field of activity („aluminum matrix composites (AMCs)“) particle-reinforced aluminum matrix composites (AMCs) are considered, with a current focus on new methods of consolidation, the development of tailor-made matrix materials by variation of alloying elements, and processing approaches to increase the thermal stability. Hybrid structures that combine aluminum with magnesium alloys or steels promise a reduction of mass and good corrosion behavior and are the focus of the third topic (“Al-based hybrid structures”). One main task is to study processes at interfaces and surfaces of these hybrid structures and to highlight the potential of aluminum-based lightweight materials; the collaboration with Leibniz Universität in Hannover helps to strengthen further research along similar lines with a focus on the combination of aluminum/titanium hybrid materials.

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Microstructural evolution in the bonding zones of co-extruded aluminium/titanium- - Advances in Engineering











Journal Reference

Journal of Materials Science, 2014, Volume 49, Issue 6, pp 2442-2455.

Dietrich, N. Grittner, T. Mehner, D. Nickel, M. Schaper, H. J. Maier, T. Lampke.

  1. Institut für Werkstoffwissenschaft und Werkstofftechnik (Material Science and Engineering), Technische Universität Chemnitz, 09107, Chemnitz, Germany.
  2. Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, An der Universität 2, 30823, Garbsen, Germany.
  3. Lehrstuhl für Werkstoffkunde, Universität Paderborn, Pohlweg 47-49, 33098, Paderborn, Germany.


In the present study, the interfacial microstructure of dissimilar Al/Ti joints formed by a co-extrusion process has been investigated. The material combinations used for the experiments were commercially pure aluminium and titanium, respectively, in the alloys EN AW-6082 and TiAl6V4. X-ray diffraction, energy-dispersive X-ray spectroscopy, electron microscopy and electron backscatter diffraction revealed titanium aluminide formation in the interface, the development of deformation bands in the sleeve material, and the occurrence of grain size refinement and twinning in the core material. The results are discussed with respect to the concept of a hard core–soft sleeve co-extrusion comprising plastic deformation to promote solid-state diffusion. The study shows the phase distribution and the microstructural evolution in the bonding zone with the aim to improve the quality of the bonding by adequately adjusting the process parameters.

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