Abstract
In order to understand the fracture behavior and room temperature brittleness of NiAl single crystals, atomic force microscopy (AFM) investigations were performed on in-situ loaded 4-point-bend specimens of hard and soft oriented crystals. A significant amount of dislocations are emitted from the crack tip on different slip systems. {1 0 0} slip planes are activated in soft crystals, whereas in hard crystals also slip planes, which are identified as {1 1 2} or {1 2 3} are observed. From evaluations of the AFM images, dislocation distributions ahead of crack tips and the plastic crack opening displacement (COD) from blunted crack tips are examined. The fracture toughness is calculated from the measured plastic COD and compared with the results obtained from load-displacement curves. First in-situ experiments on NiAl specimens heated up to 400 K are described, where a significant increase in plasticity is observed.
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