|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Solidification Processing of Nb-silicide Based Alloys
||Nicola Tankov, Claire Utton, Panayiotis Tsakiropoulos
|On-Site Speaker (Planned)
Ni based superalloys are reaching their maximum intrinsic temperature capability and thus new high temperature alloys are needed. Nb silicide based alloys are candidate alloys because they can meet property goals. These alloys obtain their properties from two main phases that are stable from room temperature up to high operating temperatures, namely the Nb5Si3 silicide that provides high temperature strength, creep and oxidation resistance, and the bcc Nbss that provides room temperature toughness and damage tolerance. Achieving the property goals requires balancing the morphology, size, distribution, volume fraction and properties of phases that critically depend on alloy chemistry and optimised processing. This presentation will compare the solidification processing and properties of a latest generation developmental alloy that has been produced using cold hearth melting and directional solidification. Phase selection/stability and microstructure development will be discussed in relation to solidification conditions and segregation phenomena.