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MM: Fachverband Metall- und Materialphysik

MM 22: Mechanical properties I - Plastic deformation & fracture

MM 22.5: Vortrag

Dienstag, 1. April 2014, 11:15–11:30, IFW B

Residual stresses and internal architectures of AlSi-alloys for cast engine components — Michael Schöbel¹, Georg Baumgartner², and •Stefan Gerth³ — ¹Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II), TU Munich, Germany — ²Umformtechnik und Gießereiwesen, TU Munich, Germany — ³Entwicklungszentrum für Röntgentechnik, Fraunhofer Institut Fürth, Germany

The increasing demand on weight and efficiency of modern combustion engines requires light alloys with improved high temperature strength and creep resistance. New cast AlSi alloys are developed to increase wear resistance and long term stability of engine components. In such materials with a composite-like micro structure high stress gradients lead to crack formation and damage under operation conditions.

Neutron diffraction is applied for micro stress analysis after casing as well as during tensile testing between the α-Al and Si phase. Complementary high resolution synchrotron tomography allowed 3D imaging of damage mechanisms and crack propagation. Both methods were combined to develop a micro-mechanical model for stress simulation and to validate its reliability for engineering AlSi alloys under reproducible boundary conditions.