Abstract
Abstract The elastic and plastic deformation at crack tips in stoichiometric single crystals of FeAl and NiAl were investigated by atomic force microscopy and optical interference microscopy. Crack propagation and plastic deformation were observed during in-situ loading in an atomic force microscope. Soft oriented NiAl crystals with and without 0.14 wt% Fe doping were investigated, and the plastic deformation in front of the crack tip is analysed by slip steps on the surface. Doping with Fe leads to a more ductile behaviour. Optical interference microscopy is an excellent technique to measure the elastic deformation around loaded crack tips on a large lateral scale. The elastic constants cij of both materials were determined with ultrasonic techniques. Because of the strong anisotropy of these intermetallic compounds the elastic out-of-plane displacement field is asymmetric. The elastic displacements measured at crack tips in FeAl and NiAl bend specimens are significantly different, which is interpreted a...
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