Brittle fracture surface morphologies of crystalline intermetallic fibres

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Abstract
The fracture surface morphologies of crystalline intermetallic fibres fractured at increasing stresses have been examined by scanning electron microscopy. Mirror, mist and hackle regions analogous to those observed in the fracture of amorphous glasses have been observed. The extent of the mirror region decreased and the severity of hackle increased with increasing fracture stress. This is consistent with a mechanism involving a critical crack velocity and critical rates of elastic energy release. The results suggest that brittle fracture mechanisms in crystalline solids may be markedly similar to those in amorphous solids.

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