Berlin 2015 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 14: Transport I: Diffusion

MM 14.4: Vortrag

Montag, 16. März 2015, 16:30–16:45, H 0107

Kinetics and structural effects induced by liquid Ga penetration into ultra-fine grained Al — •Mehrnoosh Naderi, Martin Peterlechner, Sergiy Divinski, and Gerhard Wilde — Institute of Materials Physics, University of Münster, Germany

One of the spectacular examples of liquid metal embrittlement is the fast penetration of liquid gallium into aluminum and its alloys which occurs even at room temperature, i.e. below the melting point of Ga. Since severe plastic deformation is commonly used for grain refinement and produces a high density of grain boundaries of different types, in this study we focus on the penetration of Ga along grain boundaries of ultra-fine grained Al produced by high pressure torsion (HPT). The volumetric changes and the kinetics of liquid Ga penetration into the Al grain boundary network are investigated. A two-stage process of the excess volume evolution in HPT-processed Al is observed after Ga application. The structural effects are examined by transmission electron microscopy and texture measurements, too. The surface evolution is followed by atomic force microscopy. The results are discussed concerning the underlying mechanisms that control the Ga penetration.