Berlin 2012 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 29: Topical Session Bulk Nanostrucured Materials VI - Mechanical Properties I

MM 29.2: Talk

Wednesday, March 28, 2012, 10:45–11:00, H 0107

Mechanical properties of Ti- and TiAl3 reinforced ultrafine-grained aluminium — •Christian Werner Schmidt, Heinz Werner Höppel, and Mathias Göken — Institute I: General Materials Properties, Department Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg

In this work titanium particles (d ~ 2 to 4 micron) are introduced in a highly controlled manner by airgun spraying from aqueous suspension into aluminium AA1050A by accumulative roll bonding (ARB). A layered ultrafine-grained (UFG) material with extraordinary mechanical properties, further reinforced with metallic particles is produced. By diffusional annealing, the metallic titanium particles are converted to the very hard intermetallic phase TiAl3, where the UFG matrix is recrystallized and softened. In order to re-establish the UFG structure three subsequent ARB cycles are executed. By tensile testing of the different states, strengthening effects by the grain size, particle volume fraction, and material are distinguished. Therewith the basic understanding of the mechanism of reinforcement by particles in ultrafine-grained metals is enhanced. The TiAl3 reinforced ultrafine-grained aluminium sheets are very promising due to enhanced strength as well as clearly improved thermal stability of the UFG structure caused by particle reinforcement.