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Type Isheim, Dieter; Gagliano, Michael S.; Fine, Morris E.; Seidman, David N.
  Publication Interfacial Segregation at Cu-rich Precipitates in a High-Strength Low-Carbon Steel studied on a Sub-nanometer Scale Volume Journal Article
Pages 2006
  Abstract Acta Materialia  
  Corporate Author Acta Mater.  
Publisher 54  
Editor 3
  Summary Language 841-849 Series Editor interface segregation, Gibbsian interfacial excess, ferritic steels, precipitation hardening, nanostructure, atom-probe tomography  
Abbreviated Series Title The local composition of small, coherent Cu-rich precipitates with a metastable bcc structure in a ferritic &#945;-Fe matrix of a high-strength low-carbon steel were studied by conventional atom-probe tomography (APT). The average diameter, <D>, of the precipitates is 2.5 0.3 nm at a number density of (1.1 0.3)x1024 m-3 after direct aging at 490oC for 100 min to a near peak hardness condition, yielding a value of 84 Rockwell G. Besides Cu, the precipitates contain 33 1 at.% Fe and are enriched in Al (0.5 0.1 at.%). Nickel and Mn are significantly segregated at the &#945;-Fe matrix/precipitate heterophase interfaces. The Gibbsian interfacial excesses relative to Fe and Cu are 1.5 0.4 atoms nm-2 for Ni, and 1.0 0.3 atoms nm-2 for Mn. The reduction of the interfacial free energy, calculated utilizing the Gibbs adsorption isotherm, is 16 mJ m-2 for Ni and 11 mJ m-2 for Mn.
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no NU @ karnesky @ 262
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