Early stages of phase separation using three-dimensional atom probe and atomistic modelling

2007 ◽  
Vol 39 (2-3) ◽  
pp. 178-183 ◽  
Author(s):  
Mattias Slabanja ◽  
Johan Angenete ◽  
Krystyna Stiller ◽  
Karin M. Carling ◽  
Göran Wahnström ◽  
...  
Keyword(s):  
Phase Separation ◽  
Three Dimensional ◽  
Atom Probe ◽  
Early Stages ◽  
Atomistic Modelling

The β'-α' Interaction: a Study of early Stages of Phase Separation in a Fe-20%Cr-6%Al-0.5%Ti Alloy

2011 ◽  
Vol 172-174 ◽  
pp. 315-320
Author(s):  
Carlos Capdevila ◽  
Michael K. Miller ◽  
K.F. Russell ◽  
J. Chao ◽  
F.A. López
Keyword(s):  
Phase Separation ◽  
Atom Probe Tomography ◽  
Temporal Evolution ◽  
Theoretical Calculations ◽  
Three Dimensional ◽  
Atom Probe ◽  
Early Stages ◽  
Β Phase ◽  
Α Phase ◽  
Power Measurements

The temporal evolution of the microstructure resulting from phase separation into Fe-rich (α), Cr-rich (α¢), and Fe(Ti,Al) (β¢) phases of a Fe-20Cr-6Al-0.5Ti alloy has been analyzed by thermoelectric power measurements (TEP). The early stages of decomposition and the evolution of the three-dimensional microstructure have been analyzed by atom probe tomography (APT). The roles of Cr, Al, and Ti during the decomposition process have been investigated in terms of solute partitioning between the phases. Analysis of proximity histograms revealed that significant Al and Ti partitioning occurs, which is consistent with theoretical calculations. The results indicate that as the α-α¢ phase separation proceeds, Al and Ti are rejected into the α phase, which causes the β¢ phase to nucleate on the surface of the α¢ phase.

Ordering and phase separation in Ni–Cr–Al: Monte Carlo simulations vs three-dimensional atom probe

1999 ◽  
Vol 47 (6) ◽  
pp. 1889-1899 ◽  
Author(s):  
C. Pareige ◽  
F. Soisson ◽  
G. Martin ◽  
D. Blavette
Keyword(s):  
Monte Carlo ◽  
Phase Separation ◽  
Monte Carlo Simulations ◽  
Three Dimensional ◽  
Atom Probe

The Measurement of Composition During the Early Stages of the Spinodal Decomposition of Fe-Cr Alloys

1990 ◽  
Vol 186 ◽  
Author(s):  
M.G. Hetherington ◽  
J.M. Hyde ◽  
M.K. Miller
Keyword(s):  
Monte Carlo ◽  
Phase Separation ◽  
Spinodal Decomposition ◽  
Atom Probe ◽  
Statistical Techniques ◽  
Fine Scale ◽  
Monte Carlo Calculations ◽  
Early Stages ◽  
Non Linear

AbstractThe properties of many advanced alloys are derived from extremely fine-scale microstructures. This poses interesting questions about the measurement of composition on this scale. The phase separation of model Fe-Cr alloys has been been studied with the atom-probe. Statistical techniques have been used to estimate the composition and compare the results with the predictions of linear and non-linear theories of spinodal decomposition and the distributions obtained from Monte-Carlo calculations.

scholarly journals Atomic Distribution in Catalytic Amorphous Metals

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Sanghita Mridha ◽  
David L. Jaeger ◽  
Harpreet Singh Arora ◽  
Rajarshi Banerjee ◽  
Sundeep Mukherjee
Keyword(s):  
Phase Separation ◽  
Metallic Glass ◽  
Amorphous Alloys ◽  
Three Dimensional ◽  
Atom Probe ◽  
Glassy Alloys ◽  
Atomic Distribution ◽  
Liquid Behavior ◽  
Catalytically Active ◽  
Constituent Elements

The atomic distribution in catalytically active metallic glass alloys, Pd43Cu27Ni10P20and Pt57.5Cu14.7Ni5.3P22.5, was investigated using three-dimensional atom probe microscopy. Atom probe analysis showed uniform distribution of constituent elements for both the starting amorphous alloys, with no phase separation. Both the crystallized alloys showed eutectic microstructure with a very sharp interface (~0.5 nm as determined from atom probe). The atomic distribution in the devitrified state is explained based on the “fragile liquid” behavior for these noble-metal glassy alloys.

Characterization of the Early Stages of Phase Separation by Atom probe Tomography

1999 ◽  
Vol 580 ◽  
Author(s):  
M. K. Miller
Keyword(s):  
Phase Separation ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Alloy 718 ◽  
Early Stages ◽  
Nickel Based Superalloy ◽  
Secondary Precipitates ◽  
Isothermal Ageing

AbstractAn atom probe tomography characterization of the early stages of phase separation in the FeCu-Ni system has been performed. The development of the copper-enriched regions into copper precipitates has been investigated during isothermal ageing at 573 K and 673 K for times up to 10,000 h. The formation and growth of the secondary precipitates in the nickel based superalloy, Alloy 718, have been determined during isothermal ageing at 873 K. These secondary precipitates were found to be a mixture of the L12-ordered γ' phase and the DO22-ordered γ” phase.

scholarly journals On the Role of Poly-Glutamic Acid in the Early Stages of Iron(III) (Oxy)(hydr)oxide Formation

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 715
Author(s):  
Miodrag J. Lukić ◽  
Felix Lücke ◽  
Teodora Ilić ◽  
Katharina Petrović ◽  
Denis Gebauer
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Phase Separation ◽  
Fourier Transform Infrared Spectroscopy ◽  
Fourier Transform Infrared ◽  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Oxide Formation ◽  
Early Stages ◽  
Titration Assay

Nucleation of minerals in the presence of additives is critical for achieving control over the formation of solids in biomineralization processes or during syntheses of advanced hybrid materials. Herein, we investigated the early stages of Fe(III) (oxy)(hydr)oxide formation with/without polyglutamic acid (pGlu) at low driving force for phase separation (pH 2.0 to 3.0). We employed an advanced pH-constant titration assay, X-ray diffraction, thermal analysis with mass spectrometry, Fourier Transform infrared spectroscopy, and scanning electron microscopy. Three stages were observed: initial binding, stabilization of Fe(III) pre-nucleation clusters (PNCs), and phase separation, yielding Fe(III) (oxy)(hydr)oxide. The data suggest that organic–inorganic interactions occurred via binding of olation Fe(III) PNC species. Fourier Transform Infrared Spectroscopy (FTIR) analyses revealed a plausible interaction motif and a conformational adaptation of the polypeptide. The stabilization of the aqueous Fe(III) system against nucleation by pGlu contrasts with the previously reported influence of poly-aspartic acid (pAsp). While this is difficult to explain based on classical nucleation theory, alternative notions such as the so-called PNC pathway provide a possible rationale. Developing a nucleation theory that successfully explains and predicts distinct influences for chemically similar additives like pAsp and pGlu is the Holy Grail toward advancing the knowledge of nucleation, early growth, and structure formation.

scholarly journals Oxidation of polycrystalline Ni studied by spectromicroscopy: Phase separation in the early stages of crystallite growth

2010 ◽  
Vol 81 (8) ◽  
Author(s):  
A. Cornish ◽  
T. Eralp ◽  
A. Shavorskiy ◽  
R. A. Bennett ◽  
G. Held ◽  
...  
Keyword(s):  
Phase Separation ◽  
Crystallite Growth ◽  
Early Stages

Three-dimensional atom probe study of Fe–B-based nanocrystalline soft magnetic materials

2009 ◽  
Vol 57 (15) ◽  
pp. 4463-4472 ◽  
Author(s):  
Y.M. Chen ◽  
T. Ohkubo ◽  
M. Ohta ◽  
Y. Yoshizawa ◽  
K. Hono
Keyword(s):  
Magnetic Materials ◽  
Three Dimensional ◽  
Atom Probe ◽  
Soft Magnetic Materials ◽  
Soft Magnetic
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