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

被引：137

作者：

Jiao, Z. B. ^{[1
]}

Luan, J. H. ^{[1
]}

Miller, M. K. ^{[2
]}

Yu, C. Y. ^{[1
]}

Liu, C. T. ^{[1
]}

机构：

[1] City Univ Hong Kong, Coll Sci & Engn, Dept Mech & Biomed Engn, Ctr Adv Struct Mat, Hong Kong, Hong Kong, Peoples R China

[2] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

来源：

ACTA MATERIALIA | 2015年 / 84卷

关键词：

NiAl nanoparticle; Precipitation; Microsegregation; Atom probe tomography; Mechanical property; CREEP-RESISTANT; PARAMETERS; ELEMENTS;

D O I：

10.1016/j.actamat.2014.10.065

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：283 / 291

页数：9

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