Dresden 2014 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 50: Mechanical properties III - Evolution & deformation of microstructure

MM 50.1: Talk

Thursday, April 3, 2014, 10:15–10:30, IFW B

Liquid Ga penetration into ultra-fine grained Al — •Mehrnoosh Naderi, Sergiy Divinski, and Gerhard Wilde — Institute of Material physics, Münster, Germany

Under certain conditions, liquid metal can rapidly penetrate into a solid, typically along grain boundaries the phenomenon known as liquid metal embrittlement. One of the most spectacular examples of such phenomena is the gallium penetration into an aluminum grain boundary network. Most studies in this filed relate the liquid penetration process to mechanical properties of the grain boundaries. In this work the penetration behavior of liquid Ga in ultrafine grained Al produced by high pressure torsion (HPT) was investigated by dilatometry. Penetration of liquid Ga induces an unexpected, two-stage evolution of free volume in ultra-fine grained Al. The developments of the grain boundary decoration by liquid Ga and the surface evolution have been examined by scanning electron microscopy and atomic force microscopy. The abnormal length change behavior is discussed in terms of underlying mechanisms that control the Ga penetration.