An investigation of how microstructural features affect the fracture and fatigue properties of a promising class of high temperature Mo-Si-B based alloys is presented. Fracture toughness and fatigue-crack growth properties are measured at 25o and 1300oC for five Mo-Mo3Si-Mo5SiB2 containing alloys produced by powder metallurgy with α-Mo matrices. Results are compared with previous studies on int...

With outstanding high-temperature properties, the intermetallic Mo5SiB2 alloy is regarded as an extremely competitive ultra-temperature structural material. The maximum Young’s modulus of 398.0 GPa for single crystals was found to be at vertex [010] direction, while minimum value 264.0 in [001] direction. For hardness, 451.7 HV after compression 1200 °C radial hardness 437.2 1300 axial directio...

Fracture and fatigue properties are examined for a series of Mo–Mo3Si–Mo5SiB2 alloys, which utilize a continuous a-Mo matrix to achieve unprecedented room-temperature fracture resistance (>20 MPa p m). Mechanistically, these properties are explained in terms of toughening by crack trapping and crack bridging by the more ductile a-Mo phase. 2003 Acta Materialia Inc. Published by Elsevier Ltd. Al...