Thermodynamic Assessment of Cr-Rare Earth Systems

  • Wren Chan
  • Michael C. Gao
  • Ömer N. Doğan
  • Paul King
  • Anthony D. Rollett
Basic and Applied Research

DOI: 10.1007/s11669-009-9581-3

Cite this article as:
Chan, W., Gao, M.C., Doğan, Ö.N. et al. J. Phase Equilib. Diffus. (2009) 30: 578. doi:10.1007/s11669-009-9581-3

Abstract

Addition of light rare earth elements in small amounts to refractory metal based alloys (e.g., Cr) can increase both ductility and creep resistance of an alloy because the additives absorb residual oxygen in the alloy by forming oxides that can serve as dispersion strengtheners. In this work, three binary systems, Cr-Ce, Cr-La and Cr-Y, were thermodynamically assessed based on limited experimental data available in the literature using the CALPHAD method. Self-consistent and reasonable thermodynamic descriptions for all three systems were obtained. More importantly, two predictions are made: a peritectic reaction in the La-rich side of Cr-La system and a catatectic reaction in the Y-rich side of Cr-Y system. These predictions and the developed databases are subject to future experiments that are needed to clarify several discrepancies in these binaries.

Keywords

CALPHAD Cr-Ce Cr-La Cr-Y high temperature alloys 

Copyright information

© ASM International 2009

Authors and Affiliations

  • Wren Chan
    • 1
  • Michael C. Gao
    • 2
    • 3
  • Ömer N. Doğan
    • 2
  • Paul King
    • 2
  • Anthony D. Rollett
    • 1
  1. 1.Department of Materials Science and EngineeringCarnegie Mellon UniversityPittsburghUSA
  2. 2.National Energy Technology LaboratoryAlbanyUSA
  3. 3.ParsonsSouth ParkUSA