Effects of Cr on NiAl (β′) Precipitation in Ferritic Fe-Ni-Al Alloys

C. Ferreira-Palma*, M. C. Poletti, R. M. Pineda-Huitron, V. M. López-Hirata, D. I. Rivas-López, H. J. Dorantes-Rosales

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


NiAl (β′)-strengthened ferritic alloys are promising candidates for high-temperature applications. They present a coherent precipitate–matrix interface and are usually alloyed with 10 wt pct Cr to improve corrosion resistance and provide solid solution strengthening. In this work, the effects of Cr content on the precipitation of β′ in Fe-Ni-Al ferritic alloys are studied using dilatometric analysis during continuous heating and cooling. The dilatometric data are correlated with microstructural observations, X-ray diffraction, and thermodynamic calculations. Additionally, isothermally annealed diffusion couples are used for determining the β′ phase stability during isothermal conditions. Results indicate that an increase in Cr shifts the dissolution of β′ to higher temperatures and the Curie point to lower values. Furthermore, the coarsening rate of the β′ phase increases with the concentration of Cr. The addition of Cr implies a tradeoff between beneficial aspects like increased corrosion resistance and extended β′ stability range against the partial loss of coherency and a higher coarsening rate. The agreement between thermodynamic calculations and the experimental data provides a useful insight for further materials development.

Original languageEnglish
Pages (from-to)3777-3787
Number of pages11
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Issue number9
Publication statusPublished - Sept 2021

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Fields of Expertise

  • Advanced Materials Science


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