期刊
ACTA MATERIALIA
卷 61, 期 20, 页码 7726-7740出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2013.09.011
关键词
Fe-Cu alloy; Precipitation strengthening; Alloying effect; Scanning transmission electron microscopy; Atom probe tomography
资金
- World Premier International (WPI) Research Center Initiative for Atoms, Molecules and Materials, MEXT, Japan
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. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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