Abstract
The brittleness of Ni3Al precludes its fabrication into useful structural components. B induces ductility. B is in solid solution, but above the solubility limit it precipitates in grain boundaries. Segregarted B strengthens grain boundary cohesion. The amount of Al in Ni3Al deteriorates the beneficial B contribution. Increase in Al content reduces elongation and tensile strength. Water vapor in the ambient significantly embrittles Ni3Al. The fracture mode changes from intergranular to transgranular in the B-doped Ni3Al when the amount of Al decreases. In Ni3Ge single crystals failure occurs in a brittle manner following plastic deformation without necking. Griffith concept for the fracture of brittle solids can be applied for the critical crack propagation criteria. It has been shown that both single and polycrystalline Fe3Al is not inherently brittle. In room temperature deformation, Fe3Al has a high yield stress and low work hardening. The room temperature fracture is cleavage but dimples appear at high temperature deformation.
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