Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 43: Mechanical Properties II

MM 43.1: Vortrag

Donnerstag, 17. März 2011, 18:00–18:15, IFW D

In-situ micro-cantilever tests to study the fracture properties of NiAl — •Farasat Iqbal, Johannes Ast, Karsten Durst, and Mathias Göken — Institute of General Materials Properties, Department of Materials Science & Engineering, University of Erlangen-Nürnberg, Germany

In recent years the nanomechanical testing of materials becomes an important tool to test the materials at micron or even sub-micron scale with the help of different methods. In order to understand mechanical behavior of the bulk materials at micron or sub-micron scale different existing methods including nanoindentation , micro-tensile, bulge test , micro-compression and micro-cantilever fracture test are used on different material systems. In order to understand the relation between micron scale fracture toughness to that of the bulk materials, we carried out in-situ micro-cantilever tests on anisotropic NiAl-single crystals. The reason for choosing NiAl is its brittle nature and the macroscopic fracture toughness using ASTM E399 standard has been already investigated and reported in literature. NiAl possess two orientation namely hard <101> & soft <100> and the macroscopic fracture toughness measured using ASTM 399 standard ranges 3-4 MPa m1/2 for soft orientations and 5-7 MPa m1/2 for hard orientations. Hence the micro cantilever method was used to investigate the orientation dependent fracture toughness of NiAl at micron scale and its possible relation to the macroscopic fracture toughness is also discussed.