|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Refractory Metals 2018
||Mechanical Behavior of a Three-phase Mo-Si-B Alloy Produced by Reaction Synthesis
||Xiang Yu, Sharvan Kumar
|On-Site Speaker (Planned)
Multiphase Mo-Si-B alloys containing a Mo solid solution matrix and Mo<SUB>3</SUB>Si and Mo<SUB>5</SUB>SiB<SUB>2</SUB> intermetallic phases are of interest for high temperature structural applications as they project a reasonable combination of oxidation resistance, creep resistance and acceptable damage tolerance. In this work, the uniaxial tensile and compression responses at nominal strain rates from 10<SUP>-3</SUP>/s to 10<SUP>-6</SUP>/s between 900<SUP>o</SUP>C and 1300<SUP>o</SUP>C of a three-phase alloy with ~50 vol.% T<SUB>2</SUB> + Mo<SUB>3</SUB>Si phases and produced by reaction synthesis powder processing were evaluated. An activation energy of ~400 kJ/mol suggested lattice diffusion in the Mo solid solution phase to be the rate-controlling mechanism. Tensile ductility variation with temperature was documented and fracture surfaces were characterized. Notched and fatigue-pre-cracked, three-point bend tests provided the variation of fracture toughness with temperature from room temperature to 1100<SUP>o</SUP>C. These results will be presented and compared to those previously reported in the literature.
||Planned: Supplemental Proceedings volume