Atom-probe study of Cu and NiAl nanoscale precipitation and interfacial segregation in a nanoparticle-strengthened steel

Zengbao Jiao, J. H. Luan, W. Guo, J. D. Poplawsky, C. T. Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

Published by Informa UK Limited, trading as Taylor & Francis Group. The Cu and NiAl nanoscale precipitation and interfacial segregation in the martensite and austenite phases within a high-strength steel were studied by atom-probe tomography (APT). In the martensite phase, APT reveals the precipitation of isolated NiAl nanoparticles and NiAl/Cu co-precipitates, indicating that NiAl nanoparticles form first in the precipitation sequence. In comparison, the austenite phase contains only Cu nanoparticles with Ni segregation at the particle/matrix interface, in which the Ni segregation reduces the Cu nanoparticle interfacial energy. In addition, Mn and C exhibit an enrichment at the martensite/austenite interface, and the mechanism for the interfacial segregation was also discussed.
Original languageEnglish
Pages (from-to)562-568
Number of pages7
JournalMaterials Research Letters
Volume5
Issue number8
DOIs
Publication statusPublished - 15 Nov 2017

Keywords

  • atom-probe tomography
  • Cu and NiAl precipitate
  • high-strength steel
  • interfacial segregation
  • nanoscale precipitation

ASJC Scopus subject areas

  • Materials Science(all)

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