Indentation fracture behavior of (Mo_{0.85}Nb_{0.15})Si₂crystals with C40 single-phase and MoSi₂(C11_{b})/NbSi₂(C40) duplex-phase with oriented lamellae

Koji Hagihara; Shigehito Maeda; Takayoshi Nakano; Yukichi Umakoshi

doi:10.1016/j.stam.2003.09.007

journal article·2004-01Open access

Indentation fracture behavior of (Mo_0.85Nb_0.15)Si₂crystals with C40 single-phase and MoSi₂(C11_b)/NbSi₂(C40) duplex-phase with oriented lamellae

Koji Hagihara, Shigehito Maeda, Takayoshi Nakano, Yukichi Umakoshi

Science and Technology of Advanced Materials· Volume 5· Issue 1-2

Publisher page Open full text

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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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OpenAlex topics: Intermetallics and Advanced Alloy Properties · Advanced ceramic materials synthesis · Advanced materials and composites

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References (1)

Show source-provided references

1. T. Nakano, Y. Nakai, Y. Umakoshi, unpublished results.