Analysis of the distribution of alloying elements in ultrafine-grained steel 05G2MFBT by atom-probe tomography

The partitioning of the alloying elements into the γ″ nanoparticles in a Ni2CoFeCrNb0.15 high entropy alloy was studied by the combination of atom probe tomography and first-principles calculations. The atom probe tomography results show that the Co, Fe, and Cr atoms incorporated into the Ni3Nb-type γ″ nanoparticles but their partitioning behaviors are significantly different. The Co element is much easier to partition into the γ″ nanoparticles than Fe and Cr elements. The first-principles calculations demonstrated that the different partitioning behaviors of Co, Fe and Cr elements into the γ″ nanoparticles resulted from the differences of their specific chemical potentials and bonding states in the γ″ phase.

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Interfaces in Oxides Formed on NiAlCr Doped with Y, Hf, Ti, and B

Microscopy and Microanalysis ◽

10.1017/s1431927617000186 ◽

2017 ◽

Vol 23 (2) ◽

pp. 396-403 ◽

Cited By ~ 3

Author(s):

Torben Boll ◽

Kinga A. Unocic ◽

Bruce A. Pint ◽

Krystyna Stiller

Keyword(s):

Oxide Layer ◽

Atom Probe Tomography ◽

Outer Region ◽

Atom Probe ◽

Alloying Elements ◽

Oxide Scales ◽

Protective Oxide ◽

Temperature Oxidation ◽

Small Grains ◽

Oxide Matrix

AbstractThis study applies atom probe tomography (APT) to analyze the oxide scales formed on model NiAlCr alloys doped with Hf, Y, Ti, and B. Due to its ability to measure small amounts of alloying elements in the oxide matrix and its ability to quantify segregation, the technique offers a possibility for detailed studies of the dopant’s fate during high-temperature oxidation. Three model NiAlCr alloys with different additions of Hf, Y, Ti, and B were prepared and oxidized in O2 at 1,100°C for 100 h. All specimens showed an outer region consisting of different spinel oxides with relatively small grains and the protective Al2O3-oxide layer below. APT analyses focused mainly on this protective oxide layer. In all the investigated samples segregation of both Hf and Y to the oxide grain boundaries was observed and quantified. Neither B nor Ti were observed in the alumina grains or at the analyzed interfaces. The processes of formation of oxide scales and segregation of the alloying elements are discussed. The experimental challenges of the oxide analyses by APT are also addressed.

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Influence of copper precipitates on clustering behavior of alloying elements observed in Japanese reactor pressure vessel surveillance materials using atom probe tomography

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2020.152508 ◽

2020 ◽

Vol 542 ◽

pp. 152508

Author(s):

Kenta Murakami

Keyword(s):

Pressure Vessel ◽

Atom Probe Tomography ◽

Atom Probe ◽

Reactor Pressure Vessel ◽

Alloying Elements ◽

Clustering Behavior ◽

Reactor Pressure

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Spatial Distributions of Alloying Elements Obtained from Atom Probe Tomography of the Amorphous Ribbon Fe75C11Si2B8Cr4

Korean Journal of Materials Research ◽

10.3740/mrsk.2013.23.3.190 ◽

2013 ◽

Vol 23 (3) ◽

pp. 190-193 ◽

Cited By ~ 1

Author(s):

Jinkyung Shin ◽

Seonghoon Yi ◽

Konda Gokuldoss Pradeep ◽

Pyuck-Pa Choi ◽

Dierk Raabe

Keyword(s):

Atom Probe Tomography ◽

Amorphous Ribbon ◽

Atom Probe ◽

Alloying Elements ◽

Spatial Distributions

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Carbon Redistribution in Martensite in High-C Steel: Atomic-Scale Characterization and Modelling

Metals ◽

10.3390/met8080577 ◽

2018 ◽

Vol 8 (8) ◽

pp. 577 ◽

Cited By ~ 1

Author(s):

Wenwen Song ◽

Carsten Drouven ◽

Enrique Galindo-Nava

Keyword(s):

Electron Microscopy ◽

Atom Probe Tomography ◽

Atom Probe ◽

Atomic Scale ◽

Alloying Elements ◽

Plate Martensite ◽

Carbon Redistribution ◽

Scale Characterization

The microstructure of the as-quenched plate martensite in a high-C steel 100Cr6 was characterized by means of electron microscopy and atom probe tomography. The carbon redistribution behavior was investigated at the atomic scale, which revealed the nature of the transformation dynamics influenced by carbon and other substitutional alloying elements. A model was proposed to predict the carbon redistribution at twins and dislocations in martensite, which was based on their spatial arrangements.

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Distribution of Alloying Elements within the Constituent Phases of a C-containing γ-TiAl Based Alloy studied by Atom Probe Tomography

MRS Proceedings ◽

10.1557/opl.2014.966 ◽

2014 ◽

Vol 1760 ◽

Cited By ~ 2

Author(s):

Thomas Klein ◽

Francisca Mendez-Martin ◽

Michael Schachermayer ◽

Boryana Rashkova ◽

Helmut Clemens ◽

...

Keyword(s):

Sample Preparation ◽

Atom Probe Tomography ◽

Atom Probe ◽

Solubility Limit ◽

Major Elements ◽

Alloying Elements ◽

Site Specific ◽

Close Vicinity ◽

Nb Content

ABSTRACTThe distribution of alloying elements in the constituent phases of a C-containing γ-TiAl based alloy has been characterized locally by atom probe tomography. The major elements of the alloy under consideration – Ti, Al, Nb, and Mo – are distributed uniformly within each of the constituent phases. Furthermore, Mo is preferentially dissolved in the βo-phase, whereas Nb content is similar in all phases. The selected C concentration of the alloy is below the overall solubility limit as no precipitates have been observed. Therefore, C is enriched in the α2-phase, whereas the βo-phase is depleted of C. In addition, βo/γ-interfaces have been prepared by site specific sample preparation and characterized by atom probe tomography. Segregation of Mo and C into the interfaces and their close vicinity was observed.

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