|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Powder Route Processing of Nb Silicide Based Alloys
||Claire Utton, Panayiotis Tsakiropoulos, Edward Gallagher
|On-Site Speaker (Planned)
Alloys with capabilities beyond those of Ni based superalloys include Nb silicide based alloys (or Nb in situ silicide composites). The literature on Powder Metallurgy (PM) Nb silicide alloys is limited compared with that on process – microstructure – properties of cast alloys. Few PM Nb silicide based alloys have been produced using elemental or pre-alloyed powders and processing routes that include hot isostatic pressing (HIP) and spark plasma sintering (SPS). A major challenge for PM Nb silicide based alloys is to achieve the desirable microstructures with controlled interstitial content and type, volume fraction and distribution of required phases. The latter include the bcc Nb solid solution and tetragonal Nb5Si3 as well as Laves and A15 phases. In this presentation PM processing of model and latest generation developmental alloys will be discussed with emphasis on the effects of power type (elemental or pre-alloyed) and processing parameters on microstructure and properties.