|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||The Influence of Titanium on the Phase Equilibria in Mo-Si-B Alloys
||Daniel Schliephake, Martin Heilmaier
|On-Site Speaker (Planned)
Despite some drawbacks regarding fracture toughness and oxidation resistance it is now well-established that Mo-Si-B alloys offer considerable potential for ultrahigh temperature structural engineering materials. A trade-off in combining the optimum single phase properties would virtually lead to a multiphase material exhibiting α-Mo + Mo<SUB>5</SUB>Si<SUB>3</SUB> + Mo<SUB>5</SUB>SiB<SUB>2</SUB> microstructure. The suppression of the otherwise present Mo<SUB>3</SUB>Si phase can be accomplished by the addition of Titanium is a major alloying element. In essence, we will show how Titanium promotes the eutectoid decomposition of Mo<SUB>3</SUB>Si into Mo and Mo<SUB>5</SUB>Si<SUB>3</SUB>. Hence, Mo-Si-Ti alloys with and without additional Boron were produced by repetitive arc-melting in protecting argon atmosphere, followed by homogenization treatment at high temperatures. The phases were identified by XRD, SEM and EDS/ESMA analysis. Additionally, the creep resistance of those alloys was determined at temperatures ranging from 1100 to 1300 °C to estimate their capability for high-temperature use.