Precipitation-Induced Nano-Twinning

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Precipitation-Induced Nano-Twinning Franz Dieter Fischer1, Fritz Appel2, and Helmut Clemens3 1 Institute of Mechanics, Montanuniversität Leoben, Franz-Josef-Strasse 18, Leoben, A-8700, Austria 2 Institute for Materials Research, GKSS Research Centre, Max-Planck-Strasse, Geesthacht, D21502, Germany 3 Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, FranzJosef-Strasse 18, Leoben, A-8700, Austria


γ (TiAl) alloys containing Ti3AlC perovskite precipitates show overlapping planar faults, which can apparently rearrange into embryonic twins and subsequently grow into large twins. An electron-microscopical study is introduced and followed by a micromechanical modelling of the fault and twin development process. The thickness and length of the embryonic twins can be predicted with the developed model. INTRODUCTION As described in extensive reviews [1-5] and detailed experimental [6,7] and theoretical [8, 9] studies, deformation of γ(TiAl) can be supported by mechanical twinning along 1/6

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