Temperature Resistance of Mo3Si: Phase Stability, Microhardness, and Creep Properties

Mo-Si-B alloys are one of the most promising candidates to substitute Ni based superalloys in gas turbines. The optimization their composition can be achieved more effectively using multi-scale modeling materials behavior and structural analysis components for understanding, predicting, screening properties new alloys. Nevertheless, this approach is dependent on data single phases these focus investigation Mo3Si, typical effect 100 h annealing at 1600 °C phase stability microhardness its three near-stoichiometric compositions—Mo-23Si, Mo-24Si Mo-25Si (at %)—is reported. While Mo-23Si specimen consist only Mo3Si before after annealing, comprise Mo5Si3 annealing. latter then increased by No significant difference was detected between different compositions as well creep described 1093 1300 varying stress levels 300 MPa temperatures 1050 1350 °C. Three constitutive models were used regression experimental results—(i) power law with a constant exponent, (ii) range law, (iii) temperature-dependent exponent. It confirmed that has higher resistance than Moss multi-phase alloys, but lower strength compared Mo5SiB2.