Characterization of nanoscale NiAl-type precipitates in a ferritic steel by electron microscopy and atom probe tomography

Z. K. Teng, M. K. Miller, Gautam Ghosh, C. T. Liu, S. Huang, K. F. Russell, M. E. Fine, P. K. Liaw*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

The microstructure of NiAl-type (β′) precipitates in an aged ferritic steel (Fe-12.7Al-9Ni-10.2Cr-1.9Mo, at.%) is characterized by transmission and analytical electron microscopy (AEM) and atom probe tomography (APT). The alloy shows a duplex precipitation of β′ particles: primary with an average diameter of 130 nm and secondary with an average diameter of 3 nm. Based on APT, the primary and secondary β′ have compositions of Ni41.2Al43.6Fe12.7Cr0.8Mo1.4 and Ni26.3Al41.6Fe26.9Cr3.3Mo1.7, respectively.

Original languageEnglish (US)
Pages (from-to)61-64
Number of pages4
JournalScripta Materialia
Volume63
Issue number1
DOIs
StatePublished - Jul 1 2010

Keywords

  • Analytical electron microscopy
  • Atom probe tomography
  • Ferritic steel
  • Precipitation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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