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Martin, Georges |
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Solute Transfer at Interfaces |
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2003 |
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NU @ karnesky @ |
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103 |
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Mao, Zugang; Sudbrack, Chantal K.; Yoon, Kevin E.; Martin, Georges; Seidman, David N. |
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Impact of vacancy diffusion on the early decomposition stages of alloys |
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Journal Article |
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2005 |
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Nature |
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To be submitted |
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36 |
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The kinetic pathway for nucleation and growth is commonly thought to be
dictated by the initial supersaturation of solutes in the solid solution undergoing
phase separation. We demonstrate that the details of the diffusion mechanism, in
the solid solution affect deeply the early stage morphologies of precipitates. Our
argument is based on a combined use of atomic-scale observations, with atom-probe
tomography (APT) and lattice kinetic Monte Carlo simulation of a Ni(Al,Cr) alloy.
By an optimized choice of thermodynamic and kinetic parameters we first
reproduce the experimental APT observations. We then modify only the long-range
vacancy-solute binding energy, without altering the thermodynamic driving force
for phase separation, thereby demonstrating that the microstructural evolution
changes from a coagulation to an evaporation-condensation coalescence mechanism.
The changes can only be accounted for with nonzero values for the vacancychemical potential and off-diagonal terms of the Onsager matrix, at variance with
classical models. |
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163 |
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Clouet, Emmanuel; Nastar, Maylise; Barbu, Alain; Sigli, Cristophe; Martin, Geroges |
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Precipitation in Al-Zr-Sc alloys:a comparison between kinetic Monte Carlo, cluster dynamics and classical nucleation theory |
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Book Chapter |
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2005 |
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Solid-Solid Phase Transformations in Inorganic Materials |
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2 |
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683-703 |
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Zr and Sc precipitate in aluminum alloys to form the Al3ZrxSc1−x compound which, for low
supersaturations of the solid solution, exhibits the L12 structure. The aim of the present
study is to model at an atomic scale the kinetics of precipitation and to build mesoscopic
models so as to extend the range of supersaturations and annealing times that can be simulated
up to values of practical interest. In this purpose, we use some ab initio calculations
and experimental data to fit an Ising type model describing thermodynamics of the Al-Zr-Sc
system. Kinetics of precipitation are studied with a kinetic Monte Carlo algorithm based on
an atom-vacancy exchange mechanism. Cluster dynamics is then used to model at a mesoscopic
scale all the different stages of homogeneous precipitation in the two binary Al-Zr and
Al-Sc alloys. This technique correctly manages to reproduce both the kinetics of precipitation
simulated with kinetic Monte Carlo as well as experimental observations. Focusing
on the nucleation stage, it is shown that classical theory well applies as long as the short
range order tendency of the system is considered. This allows us to propose an extension of
classical nucleation theory for the ternary Al-Zr-Sc alloy. |
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TMS |
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Howe, J. M.; Laughlin, D. E.; Lee, J. K.; Dahmen, U.; Soffa, W. A. |
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NU @ karnesky @ |
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166 |
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Soisson, F.; Martin, G. |
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Monte Carlo Simulations of the Decomposition of Metastable Solid Solutions: Transient and Steady-State Nucleation Kinetics |
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Journal Article |
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2000 |
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Physical Review B |
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62 |
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203-214 |
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phase-separation
ising-model
diffusion
alloys
growth
systems
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We present a study on the kinetics of coherent precipitation in weakly super-saturated substitutional solid solutions by the Monte Carlo method. Our simulations are based on a simple atomistic model of diffusion by vacancy jumps. The whole precipitation process (from early stages to late stage coarsening) is followed for various supersaturations and temperatures, and typical behaviors observed in the simulations are compared to those predicted by the classical theories. Special emphasis is placed on the first stages of the decomposition (incubation and nucleation) and on the effects of the vacancy diffusion mechanism. Finally we consider the addition of a third (impurity) element, which can be used to control the kinetic pathway: such effects are quantitatively explored with the Monte Carlo method. |
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Soisson, F.
CEA Saclay, DECM, SRMP, Rech Met Phys Sect, F-91191 Gif Sur Yvette, France
CEA Saclay, DECM, SRMP, Rech Met Phys Sect, F-91191 Gif Sur Yvette, France |
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Times Cited: 18
Article
English
Cited References Count: 44
331ul |
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refbase @ user |
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1603 |
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Habibi-Bajguirani, H. R.; Martin, J. W.; Cantor, B. |
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TEM Studies of the Precipitation in High {Zr} Spray Formed {Al-Li-Zr} |
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Book Chapter |
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1996 |
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Aluminium Alloys: Their Physical and Mechanical Properties, Pts 1-3 |
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871-876 |
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Materials Science Forum |
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refbase @ user |
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1166 |
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Soisson, F.; Martin, G. |
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Kinetics of Decomposition of Metastable Solid Solutions: Comparison between Monte Carlo Simulations and Classical Theories |
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Book Chapter |
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1999 |
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Proceedings of the International Conference on Solid-Solid Phase Transformations |
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757-760 |
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precipitation, nucleation, incubation time, Monte Carlo simulations |
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We present a study on the kinetics of coherent precipitation in metallic binary alloys by . ~ Monte ~ & l osim ulations, based on a simple atomistic model with diffusion by vacancy jumps~ .
The whole precipitation process (from early stages to late stage coarsening) is followed for
various surpersaturations and temperatures, and typical behaviours observed in the simulations
are compared to those predicted by the classical theories. Special emphasis is placed on the first
stages of the decomposition (incubation and nucleation). |
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NU @ karnesky @ |
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276 |
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Athenes, M.; Soisson, F.; Bellon, P.; Martin, G. |
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Solid State Diffusion and Configurational Kinetics |
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Book Chapter |
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1999 |
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Proceedings of the International Conference on Solid-Solid Phase Transformations |
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433-440 |
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precipitation, ordering, nucleation, growth, coarsening, diffusion, vacancy, atomic scale, Monte Carlo simulation, kinetics |
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NU @ karnesky @ |
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277 |
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Ladwig, Peter F.; Olson, Jesse D.; Bunton, Joseph H.; Larson, David J.; Ulfig, Robert M.; Martens, Richard L.; Gribb, Tye T.; Kelly, Thomas F.; Bonsager, Martin C.; Schultz, Allan E.; Pant, Bharat B.; Chang, Y. Austin |
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Intermixing and phase separation at the atomic scale in Co-rich (Co,Fe) and Cu multilayered nanostructures |
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Journal Article |
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2005 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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87 |
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121912:1-3 |
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LEAP |
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Despite the fact that Co-rich (Co,Fe) alloys and Cu are immiscible materials in bulk form, evidence of thermally induced mixing at the atomic scale has been observed in thin-film multilayers of (Co,Fe) and Cu. However, long term anneals at lower temperatures produced a breakup of the multilayers into a two-phase mixture of (Co,Fe) and Cu particles. The observations were made with the use of the three-dimensional atom probe technique, with supporting evidence from differential scanning calorimetry and x-ray diffraction. Besides their scientific importance, these results are of interest where these (Co,Fe) and Cu thin films are used to produce the giant magnetoresistive effect. |
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NU @ karnesky @ |
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420 |
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Antepara, I.; Villarreal, I.; Rodriguez-Martinez, L.M.; Lecanda, N.; Castro, U.; Laresgoiti, A |
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Evaluation of ferritic steels for use as interconnects and porous metal supports in IT-SOFCs |
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Journal Article |
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2005 |
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Journal of Power Sources |
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151 |
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103-107 |
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SOFC; ferritic stainless steel; oxidation; ASR |
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As a way of reducing the production costs of stacks by replacing ceramic components with metal components with a similar thermal expansion coefficient (TEC), today, much of the research work has focused on SOFCs operating at temperatures of under 800 degrees C. Some semi-commercial ferritic stainless steels (FSS) satisfy this TEC. Ikerlan has evaluated samples of two of these. Also, AMETEK stainless steel powders were tested in sintered disks until they were completely densified in order to compare results from dense and porous materials. The first tests performed by Ikerlan were conducted with dense samples and included the oxidation test in air at 800 degrees C and measurements of contact surface electrical resistance (area specific resistance, ASR), to compare electrochemical techniques (electrochemical impedance spectroscopy, EIS) with the traditional four-wire method and indirect measuring of the resistance through current and voltage measurements. An alloy from the last melt manufactured by the company ThyssenKrupp VDM GmbH performed best. These results did not differ greatly from the previous laboratory results attained during alloy development. Only AMETEK powder metallurgy materials were tested as porous bodies, to compare these with these dense materials. and were found to provide much higher oxidation levels, as might be expected. While dense materials can operate under the working conditions of the SOFC, porous materials still need new alloys. |
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NU @ karnesky @ |
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497 |
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Martin, Georges |
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Publication LIst of Georges Martin (2021) |
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Miscellaneous |
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2021 |
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Publication LIst of Georges Martin (2021) |
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NU @ isheim @ |
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