Elastic Moduli and Mechanical Properties of Mo5SiB2 Single Crystals in the Mo-Si-B System

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 direction {111}<110>, showing obvious anisotropy. Under compression, flow stresses rapidly increased and then decreased with increase strain, corresponding two different stages work hardening softening. An EBSD test showed that grain orientation remained same rates, but texture different. After crystal underwent plastic deformation, dislocations slipped along slip plane, rotated, so changed from {111}<110> {001}<110>.