Synergistic alloying effect on microstructural evolution and mechanical properties of Cu precipitation-strengthened ferritic alloys

Y. R. Wen, Y. P. Li, A. Hirata, Y. Zhang, T. Fujita, T. Furuhara, C. T. Liu, A. Chiba, M. W. Chen

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

We report the influence of alloying elements (Ni, Al and Mn) on the microstructural evolution of Cu-rich nanoprecipitates and the mechanical properties of Fe-Cu-based ferritic alloys. It was found that individual additions of Ni and Al do not give rise to an obvious strengthening effect, compared with the binary Fe-Cu parent alloy, although Ni segregates at the precipitate/matrix interface and Al partitions into Cu-rich precipitates. In contrast, the co-addition of Ni and Al results in the formation of core-shell nanoprecipitates with a Cu-rich core and a B2 Ni-Al shell, leading to a dramatic improvement in strength. The coarsening rate of the core-shell precipitates is about two orders of magnitude lower than that of monolithic Cu-rich precipitates in the binary and ternary Fe-Cu alloys. Reinforcement of the B2 Ni-Al shells by Mn partitioning further improves the strength of the precipitation-strengthened alloys by forming ultrastable and high number density core-shell nanoprecipitates.

Original languageEnglish
Pages (from-to)7726-7740
Number of pages15
JournalActa Materialia
Volume61
Issue number20
DOIs
Publication statusPublished - 2013 Dec 1

Keywords

  • Alloying effect
  • Atom probe tomography
  • Fe-Cu alloy
  • Precipitation strengthening
  • Scanning transmission electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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