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Fracture strength and fracture behavior of sintered two-phase tungsten alloy specimens with various notch root radii were investigated. Cracks mainly initiated by interface decohesion between tungsten particles at the notch root. Cleavage fracture of tungsten particle was observed for the material with higher volume fraction of ductile matrix phase. No significant variation of crack initiation strength was found for notch root radii larger than 5mm. However, crack initiation strength significantly decreased with reducing notch root radii for the radii smaller than 5mm. The non-linear notch mechanics proposed by Nisitani et al has been successfully applied to the present materials.

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