Communication

Metallurgical and Materials Transactions A

, Volume 43, Issue 10, pp 3423-3427

Effect of Al on the NiAl-Type B2 Precipitates in Ferritic Superalloys

  • Shenyan HuangAffiliated withDepartment of Materials Science and Engineering, The University of TennesseeGE Global Research
  • , Gautam GhoshAffiliated withDepartment of Materials Science and Engineering, Northwestern University
  • , Xin LiAffiliated withIndiana University Center for the Exploration of Energy and MatterPhysics Department, Indiana University
  • , Jan IlavskyAffiliated withX-Ray Science Division, Advanced Photon Source, Argonne National Laboratory
  • , Zhenke TengAffiliated withDepartment of Materials Science and Engineering, The University of TennesseeOak Ridge National Laboratory
  • , Peter K. LiawAffiliated withDepartment of Materials Science and Engineering, The University of Tennessee Email author 

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Abstract

Ultra-small-angle X-ray scattering (USAXS) is employed to quantify the average size, interparticle spacing, and volume fraction of the primary B2 precipitates in Fe-based superalloys with varying Al concentration. The results are analyzed with a model incorporating polydispersity and interference effects and verified by transmission electron microscopy (TEM) characterizations. As the Al amount increases from 4 to 10 mass pct, there is an approximately 40 pct decrease in the average interparticle spacing and ~30 pct reduction in the average particle diameter.