Abstract
Fracture behavior and toughness of C40-structured (Mo0.85Nb0.15)Si2 single crystals and MoSi2(C11b)/NbSi2(C40) duplex-phase crystals with oriented lamellae were investigated by micro-Vickers hardness tests. The indentation fracture toughness in the C40 single-phase showed low values of about 1.0–1.4 MPa m1/2, while fracture toughness was improved in the duplex-phase crystals. Ductile phase toughening by the C11b phase, deflection of crack-propagation at the lamellar boundary and the effect of residual stress field at the crack tip are considered to be responsible for the increment of fracture toughness of MoSi2(C11b)/NbSi2(C40) duplex-phase crystals.
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