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

Authors :
Wen, Y.R.
Hirata, A.
Zhang, Z.W.
Fujita, T.
Liu, C.T.
Jiang, J.H.
Chen, M.W.
Source :
Acta Materialia. Apr2013, Vol. 61 Issue 6, p2133-2147. 15p.
Publication Year :
2013

Abstract

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 ∼6nm during long time annealing, corresponding to obvious coarsening of the precipitates and dramatic loss in hardness of the alloy. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
13596454
Volume :
61
Issue :
6
Database :
Academic Search Index
Journal :
Acta Materialia
Publication Type :
Academic Journal
Accession number :
85585317
Full Text :
https://doi.org/10.1016/j.actamat.2012.12.034