Vacancy-controlled ultrastable nanoclusters in nanostructured ferritic alloys

Zhang, Z. W.; Yao, L.; Wang, X. -L.; Miller, M. K.

doi:10.1038/srep10600

Title: Vacancy-controlled ultrastable nanoclusters in nanostructured ferritic alloys

Journal Article · Fri May 29 00:00:00 EDT 2015 · Scientific Reports

DOI:https://doi.org/10.1038/srep10600· OSTI ID:1207043

Zhang, Z. W. ^[1]; Yao, L. ^[2]; Wang, X. -L. ^[3]; Miller, M. K. ^[2]

Harbin Engineering Univ., Harbin (China); Oak Ridge National Lab., Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
City Univ. of Hong Kong, Kowloon (Hong Kong)

A new class of advanced structural materials, based on the Fe-O-vacancy system, has exceptional resistance to high-temperature creep and excellent tolerance to extremely high-dose radiation. Although these remarkable improvements in properties compared to steels are known to be associated with the Y-Ti-O-enriched nanoclusters, the roles of vacancies in facilitating the nucleation of nanoclusters are a long-standing puzzle, due to the experimental difficulties in characterizing vacancies, particularly in-situ while the nanoclusters are forming. We report an experiment study that provides the compelling evidence for the presence of significant concentrations of vacancies in Y-Ti-O-enriched nanoclusters in a nanostructured ferritic alloy using a combination of state-of-the-art atom-probe tomography and in situ small angle neutron scattering. The nucleation of nanoclusters starts from the O-enriched solute clustering with vacancy mediation. The nanoclusters grow with an extremely low growth rate through attraction of vacancies and O:vacancy pairs, leading to the unusual stability of the nanoclusters.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1207043

Journal Information:: Scientific Reports, Vol. 5; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 25 works

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