Oxidation Resistant Ductile Molybdenum Disilicide Alloys

This project will investigate the feasibility of alloying MoSi, to improve its low temperature ductility and fracture toughness without degrading its oxidation resistance and creep strength while maintaining a similar density. The project objective is to lower the brittle-ductile transition temperature of MOSi2 to about 400C to 500C through structural modifications. MOSi2 alloy powders will be prepared by mechanical alloying and consolidated by hot pressing. The mechanical properties of the alloys, strength, hardness, fracture toughness, and elastic modulus will be measured. The brittle-ductile transition temperature will be determined through room temperature and high temperature strength tests. X-ray diffraction and advanced electron microscopy techniques will be used to study the phase composition, crystal structure, and microstructure of the alloys.