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Abstract
It has been observed that in bulk specimens indentation-induced plastic deformation at room temperature causes intergranular fracture in the σ-phse of the NbTiAl system. The TEM study of the indented regions has revealed that only intergranular microcracks, which develop when two slip bands impinge on both sides of a boundary or when a slip band arrives at a grain boundary triple point, are resulted by the dislocation—grain boundary interaction. Consequently, upon subsequent loading of the indented speciments the crack propagates intergranularly in these regions. In the undeformed σ-phase, the accidental cracks that develop during the thin foil preparation have been found to follower a predominantly transgranular path, similar to the bulk specimen, with no dislocation activity at their tips. In contrast, in the plastically deformed regions the accidental cracks follow the path along slip bands. This phenomenon is believed to be a thin-foil effect.
Published Version
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