|About this Abstract
||Materials Science & Technology 2012
||Raymond W. Buckman, Jr. Memorial Symposium for Refractory Metals and Alloys
||Microstructure Development of Ultra-high Temperature Mo-Nb-Si-B Alloys
||Ridwan Sakidja, Megan Jarosinski, John H Perepezko, K Sharvan Kumar
|On-Site Speaker (Planned)
Mo-Si-B alloys offer attractive high temperature properties including excellent oxidation resistance and high strength and creep resistance. The alloy microstructure is comprised of a majority phase of BCC together with silicide and borosicilide (T2) phases. Due to solidification segregation however, non-equilibrium phases such as borides typically will form and are very difficult to remove even with subsequent annealing process at ultra-high temperatures. Partial substitution of Nb for Mo eliminates this issue due its effect in enhancing the thermodynamic stability of the T2 phase. Further, the Nb alloying creates new ultra-high temperature eutectic microstructures with enhanced mechanical properties at temperatures up to 1600°C with a potential for scale-up by solidification processing.
||Definite: A CD-only volume