Effects of Mn partitioning on nanoscale precipitation and mechanical properties of ferritic steels strengthened by NiAl nanoparticles

Jiao, Z. B.; Luan, J. H.; Miller, Michael K.; Yu, C. Y.; Liu, C. T.

doi:10.1016/j.actamat.2014.10.065

Title: Effects of Mn partitioning on nanoscale precipitation and mechanical properties of ferritic steels strengthened by NiAl nanoparticles

Journal Article · Sun Feb 01 00:00:00 EST 2015 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2014.10.065· OSTI ID:1185506

Jiao, Z. B. ^[1]; Luan, J. H. ^[1]; Miller, Michael K. ^[2]; Yu, C. Y. ^[1]; Liu, C. T. ^[1]

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

The critical role of Mn partitioning in the formation of ordered NiAl nanoparticles in ferritic steels has been examined through a combination of atom probe tomography (APT) and thermodynamic and first-principles calculations. Our APT study reveals that Mn partitions to the NiAl nanoparticles, and dramatically increases the particle number density by more than an order of magnitude, leading to a threefold enhancement in strengthening. Atomistic structural analyses reveal that Mn is energetically favored to partition to the NiAl nanoparticles by preferentially occupying the Al sublattice, which not only increases the driving force, but also reduces the strain energy for nucleation, thereby significantly decreasing the critical energy for formation of the NiAl nanoparticles in ferritic steels. In addition, the effects of Mn on the precipitation strengthening mechanisms were quantitatively evaluated in terms of chemical strengthening, coherency strengthening, modulus strengthening and order strengthening.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185506

Journal Information:: Acta Materialia, Vol. 84, Issue C; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 79 works

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atom probe tomography
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