Atom-probe study of Cu and NiAl nanoscale precipitation and interfacial segregation in a nanoparticle-strengthened steel

Jiao, Z. B.; Luan, J. H.; Guo, W.; Poplawsky, J. D.; Liu, C. T.

doi:10.1080/21663831.2017.1364675

Title: Atom-probe study of Cu and NiAl nanoscale precipitation and interfacial segregation in a nanoparticle-strengthened steel

Journal Article · Mon Aug 14 00:00:00 EDT 2017 · Materials Research Letters

DOI:https://doi.org/10.1080/21663831.2017.1364675· OSTI ID:1474732

Jiao, Z. B. ^[1]; Luan, J. H. ^[2]; Guo, W. ^[3]; Poplawsky, J. D. ^[3]; Liu, C. T. ^[2]

City Univ. of Hong Kong (China). Center for Advanced Structural Materials. Dept. of Mechanical and Biomedical Engineering. College of Science and Engineering; The Hong Kong Polytechnic Univ. (China). Dept. of Mechanical Engineering
City Univ. of Hong Kong (China). Center for Advanced Structural Materials. Dept. of Mechanical and Biomedical Engineering. College of Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences

The Cu and NiAl nanoscale precipitation and interfacial segregation in the martensite and austenite phases within a high-strength steel were studied by atom-probe tomography (APT). In the martensite phase, APT reveals the precipitation of isolated NiAl nanoparticles and NiAl/Cu co-precipitates, indicating that NiAl nanoparticles form first in the precipitation sequence. In comparison, the austenite phase contains only Cu nanoparticles with Ni segregation at the particle/matrix interface, in which the Ni segregation reduces the Cu nanoparticle interfacial energy. In addition, Mn and C exhibit an enrichment at the martensite/austenite interface, and the mechanism for the interfacial segregation was also discussed.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); City Univ. of Hong Kong (China)

Sponsoring Organization:: USDOE Office of Science (SC); City Univ. of Hong Kong (China); General Research Fund, Hong Kong (China); Collaborative Research Fund, Hong Kong (China); Research Grant Council, Hong Kong (China)

Grant/Contract Number:: AC05-00OR22725; 7004686; CityU11205515; C1027-14E

OSTI ID:: 1474732

Journal Information:: Materials Research Letters, Vol. 5, Issue 8; ISSN 2166-3831

Publisher:: Taylor and FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Cu and NiAl precipitate
nanoscale precipitation
interfacial segregation
high-strength steel
atom-probe tomography

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