The tensile response of Mo, Mo–Re and Mo–Si solid solutions

Abstract

Recrystallized, commercially pure Mo, binary Mo–27at.% Re, and as-extruded and variously annealed Mo–0.3at.% Si alloys were tested in uniaxial tension as a function of temperature in vacuum. The Mo–Re solid solution is significantly stronger than Mo and retains the strength to at least 800°C. The alloy exhibits serrated flow in the 500°C–800°C range and this is accompanied by a continuous decrease in ductility with increasing temperature in this temperature range. The recrystallized Mo–0.3at.% Si alloy is softer than pure Mo at room temperature and has high ductility (~60% tensile elongation). In the worked condition, it is significantly stronger (σy>600MPa) but still is ductile at room temperature (~10% tensile elongation). The observation of ductility at room temperature in this Mo–0.3at.% Si solid solution alloy has important implications for multiphase ternary Mo–Si–B alloys of technological interest.