|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Scalable Processing, Microstructure, and Mechanical Properties in Mo-matrix Mo-Si-B
||Peter Marshall, Oliver Strbik
|On-Site Speaker (Planned)
The design and development of Molybdenum matrix, Mo-Si-B materials for high temperature and oxidizing structural applications has shown promise for increasing operating temperatures, with the particular advantage of a tough, metallic matrix. The refractory three phase microstructure of a Mo matrix containing Mo3Si (A15) and Mo5SiB2 (T2) grains results in high hot strength and creep resistance up to 1300C. Further, at high temperatures a borosilicate surface scale can form from the intermetallic phases providing oxidation resistance. The refectory nature of molybdenum and its mechanical sensitivity to impurities are challenges for scalable and cost effective processing. Powder techniques can produce molybdenum matrix material however the sintering temperature, material purity, and silicon supersaturation must be balanced. The impact of these factors upon the ductile to brittle transition temperature, high temperature strength, and creep resistance have been investigated and the results used to inform further development and scale-up.