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Molybdenum boron silicides containing between 18 and 31 vol.% α-Mo are prepared by reactive hot-pressing from Mo–Si–B powder mixtures. Their microstructures and mechanical properties are investigated. The multiphase alloys consist of Mo 3 Si, Mo 5 SiB 2 and discontinuous α-Mo. The results demonstrate that the volume fraction of α-Mo and B content exerts a significant effect on the flexural strength and fracture toughness of the multiphase alloys.