Neutron-diffraction study and modeling of the lattice parameters of a NiAl-precipitate-strengthened Fe-based alloy

Teng, Zhenke; Ghosh, Gautam; Miller, M.K.; Huang, Shenyan; Clausen, B.; Brown, Donald W.; Liaw, Peter K.

doi:10.1016/j.actamat.2012.05.033

Cited by 70 publications

(33 citation statements)

References 36 publications

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“…The precipitation of cementite is expected due to the high degree of carbon supersaturation following the bainite transformation [1,7]. The formation of β-(Ni, Fe) Al is both expected from thermodynamic calculations ( Figure 1) and consistent with other steels with high nickel and aluminium contents [2][3][4].…”

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confidence: 72%

Intermetallic-strengthened nanocrystalline bainitic steel

Hulme-Smith

Ooi

Bhadeshia

2018

Materials Science and Technology

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A new thermally stable, nanocrystalline bainitic steel has been developed, rich in nickel and aluminium. During tempering, it is expected that a significant quantity of intermetallic precipitates will form. This was confirmed by X-ray diffractometry, scanning transmission electron microscopy, Fourier transform analysis of atomic column images, energy dispersive X-ray spectroscopy and selected area electron diffraction. These are the first intermetallics to be produced in a nanocrystalline bainitic steel. ARTICLE HISTORY

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confidence: 72%

Intermetallic-strengthened nanocrystalline bainitic steel

Hulme-Smith

Ooi

Bhadeshia

2018

Materials Science and Technology

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“…Ni atoms occupy the cube-corner sites and Al atoms occupy the body-center sites [16][17][18]. The lattice constant of the stoichiometric NiAl is 0.2887 nm, which is close to that of body-centered cubic (bcc) Fe (0.2866 nm), such that the NiAl phase satisfies the lattice coherency requirement in the bcc Fe matrix [1]. Transmission electron microscopy studies revealed that the NiAl nanoparticles are spherical in shape and are dispersed uniformly, with perfect coherency with the Fe matrix [19][20][21].…”

Section: Introductionmentioning

confidence: 91%

“…Ultrahigh-strength steels are highly desirable for a wide range of lightweight applications, such as in vehicles, aerospace and wind energy. Uniform precipitation of intermetallic nanoparticles has been recognized as a powerful method for strengthening steels, because high-energy antiphase boundaries must be created by moving dislocations [1][2][3][4][5]. The degree of strengthening so obtained is highly dependent upon the type, number density and size of the nanoparticles, and the nature of the interaction of the dislocations with the nanoparticles [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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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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“…Coherent precipitate-strengthened alloys in Fe-Cr-Ni-Al system have received attentions as a candidate for high-temperatures applications, such as fossil-power plants, due to their promising mechanical properties, corrosion/oxidation resistance, and cost efficiency123456. These materials consist of the primary B2-NiAl precipitate homogeneously distributed in the body-centered cubic (bcc) Fe matrix.…”

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High Temperature Deformation Mechanism in Hierarchical and Single Precipitate Strengthened Ferritic Alloys by In Situ Neutron Diffraction Studies

Song

Sun

et al. 2017

Sci Rep

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The ferritic Fe-Cr-Ni-Al-Ti alloys strengthened by hierarchical-Ni2TiAl/NiAl or single-Ni2TiAl precipitates have been developed and received great attentions due to their superior creep resistance, as compared to conventional ferritic steels. Although the significant improvement of the creep resistance is achieved in the hierarchical-precipitate-strengthened ferritic alloy, the in-depth understanding of its high-temperature deformation mechanisms is essential to further optimize the microstructure and mechanical properties, and advance the development of the creep resistant materials. In the present study, in-situ neutron diffraction has been used to investigate the evolution of elastic strain of constitutive phases and their interactions, such as load-transfer/load-relaxation behavior between the precipitate and matrix, during tensile deformation and stress relaxation at 973 K, which provide the key features in understanding the governing deformation mechanisms. Crystal-plasticity finite-element simulations were employed to qualitatively compare the experimental evolution of the elastic strain during tensile deformation at 973 K. It was found that the coherent elastic strain field in the matrix, created by the lattice misfit between the matrix and precipitate phases for the hierarchical-precipitate-strengthened ferritic alloy, is effective in reducing the diffusional relaxation along the interface between the precipitate and matrix phases, which leads to the strong load-transfer capability from the matrix to precipitate.

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Neutron-diffraction study and modeling of the lattice parameters of a NiAl-precipitate-strengthened Fe-based alloy

Cited by 70 publications

References 36 publications

Intermetallic-strengthened nanocrystalline bainitic steel

Intermetallic-strengthened nanocrystalline bainitic steel

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

High Temperature Deformation Mechanism in Hierarchical and Single Precipitate Strengthened Ferritic Alloys by In Situ Neutron Diffraction Studies

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