Microstructure characterization of Cu-rich nanoprecipitates in a Fe-2.5 Cu-1.5 Mn-4.0 Ni-1.0 Al multicomponent ferritic alloy

Y. R. Wen, Akihiko Hirata, Z. W. Zhang, T. Fujita, C. T. Liu, J. H. Jiang, M. W. Chen

Research output: Contribution to journalArticle

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Abstract

The evolution of precipitates in a Fe-2.5 Cu-1.5 Mn-4.0 Ni-1.0 Al multicomponent ferritic alloy during annealing at 500 °C was systematically investigated by aberration-corrected scanning transmission electron microscopy. The atomic-scale structure and chemistry characterization reveal that primary precipitates with enriched Cu, Ni, Mn and Al originate from continuous growth of B2 ordered domains in the as-quenched alloy. The formation of a Cu-rich body-centered cubic (bcc) phase takes place by the decomposition of the B2 ordered primary phase, which forms a Cu-rich bcc core and ordered B2-Ni(Al,Mn) shell. The B2 shells serve as a buffer layer to moderate the coherent strain and to prohibit the inter-diffusion between the Cu-rich precipitates and bcc-Fe matrix, giving rise to a low coarsening rate of the precipitates. The Cu-rich precipitates experience a structural transformation from bcc to 9R at a critical size of ∼6 nm during long time annealing, corresponding to obvious coarsening of the precipitates and dramatic loss in hardness of the alloy.

Original languageEnglish
Pages (from-to)2133-2147
Number of pages15
JournalActa Materialia
Volume61
Issue number6
DOIs
Publication statusPublished - 2013 Apr 1
Externally publishedYes

Fingerprint

Precipitates
Microstructure
Coarsening
Annealing
Buffer layers
Aberrations
Hardness
Transmission electron microscopy
Decomposition
Scanning electron microscopy

Keywords

  • Core/shell precipitates
  • Fe-Cu alloy
  • Precipitation hardening
  • STEM

ASJC Scopus subject areas

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

Cite this

Microstructure characterization of Cu-rich nanoprecipitates in a Fe-2.5 Cu-1.5 Mn-4.0 Ni-1.0 Al multicomponent ferritic alloy. / Wen, Y. R.; Hirata, Akihiko; Zhang, Z. W.; Fujita, T.; Liu, C. T.; Jiang, J. H.; Chen, M. W.

In: Acta Materialia, Vol. 61, No. 6, 01.04.2013, p. 2133-2147.

Research output: Contribution to journalArticle

Wen, Y. R. ; Hirata, Akihiko ; Zhang, Z. W. ; Fujita, T. ; Liu, C. T. ; Jiang, J. H. ; Chen, M. W. / Microstructure characterization of Cu-rich nanoprecipitates in a Fe-2.5 Cu-1.5 Mn-4.0 Ni-1.0 Al multicomponent ferritic alloy. In: Acta Materialia. 2013 ; Vol. 61, No. 6. pp. 2133-2147.
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