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MM: Fachverband Metall- und Materialphysik
MM 60: Nanomaterials IV - Deformation and mechanical properties
MM 60.5: Talk
Thursday, April 3, 2014, 16:45–17:00, IFW B
Processing of Ti/Al light-weight composite sheets via accumulative roll bonding and differential speed rolling — •Jan Romberg1,2, Jens Freudenberger1,3, Juliane Scharnweber4, Tom Marr1, Jürgen Eckert1,2, Werner Skrotzki4, and Ludwig Schultz1,2 — 1IFW Dresden, Dresden, Germany — 2TU-Dresden, Institut für Werkstoffwissenschaft, Dresden, Germany — 3TU-BA Freiberg, Institut fuer Werkstoffwissenschaft, Freiberg, Germany — 4TU-Dresden, Institut für Strukturphysik, Dresden, Germany
Severe plastic deformation (SPD) techniques facilitate the generation of ultra-fine grained metals and, therefore, increase strength and ductility. Among the SPD techniques accumulative roll bonding (ARB) is the only one that facilitates the creation of semi-finished products of reasonable size. In addition, composite materials can be produced by means of ARB. The aim of this study is to create fine laminar Ti/Al composite sheets by means of ARB. Literature discusses the effect of differences in yield stress and presents opportunities of further processing in spite of necked Ti layers. However, previous research have not noticed that the only precondition to avoid necking is sufficient strain hardening. We discuss approaches to increase the strain hardening by means of intermediate heat treatment, the effect of increase of the strain rate and differential speed rolling. The effect of this means on grain size, strength and texture development is shown. It can be expected that further classes of composite materials and non equilibrium solid solutions will be created with the help of the presented results.