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Martin, G. |
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The Joint Research Program ?CPR Precipitation?: - Breakthroughs in the Understanding of Kinetic Pathways for the Early Stages of Phase Separation |
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Journal Article |
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2006 |
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Abstract |
Advanced Engineering Materials |
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The Joint Research Program ?CPR Precipitation? |
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8 |
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12 |
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1222-1224 |
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No abstract. |
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1527-2648 |
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NU @ karnesky @ Martin2006 |
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1854 |
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Wu, Ling-Mei; Seyring, Martin; Rettenmayr, Markus; Wang, Wen-Hsiung |
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Characterization of precipitate evolution in an artificially aged Al-Zn-Mg-Sc-Zr alloy |
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Journal Article |
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2010 |
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Materials Science and Engineering: A |
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527 |
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1068-1073 |
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Al-Zn-Mg-Sc-Zr alloy; age hardening; precipitation; transmission electron microscopy (TEM) |
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The precipitates of an age hardenable Al-Zn-Mg-Sc-Zr alloy aged at 140 °C have been studied by transmission electron microscopy (TEM). The results are interpreted in terms of structural transformations that involve two types of Guinier-Preston (GP) zones (I and II), the metastable [eta]’ hardening precipitate and the stable phase [eta]-phase (MgZn2). At early stages of ageing, the GPI zones act as nucleation sites for the plate-like [eta]’ phase which precipitates on the 111Al plane. The transformation from [eta]’ to [eta] occurs gradually at longer ageing times. The [eta] particles mainly consist of [eta]1 and [eta]2 phase, with small amounts of [eta]4 type and minor quantities of [eta]’ type structures. Furthermore, while a fine dispersion of coherent Al3(Sc,Zr) precipitates is known to have a beneficial effect on the strengthening of the alloy, the formation of GPII zones is suppressed in the presence of zirconium that leads to a reduction in the amount of [eta]’ formed during subsequent ageing. |
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0921-5093 |
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NU @ karnesky @ Wu2009 |
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10688 |
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Martinez, E.; Fu, C.-C.; Levesque, M.; Nastar, M.; Soisson, F. |
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Simulations of decomposition kinetics of Fe-Cr solid solutions during thermal aging |
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Journal Article |
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2011 |
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Solid State Phenomena |
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172-174 |
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1016 |
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cond-mat.mtrl-sci; cond-mat.stat-mech; physics.comp-ph |
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The decomposition of Fe-Cr solid solutions during thermal aging is modeled by Atomistic Kinetic Monte Carlo (AKMC) simulations, using a rigid lattice approximation with composition dependant pair interactions that can reproduce the change of sign of the mixing energy with the alloy composition. The interactions are fitted on ab initio mixing energies and on the experimental phase diagram, as well as on the migration barriers in iron and chromium rich phases. Simulated kinetics is compared with 3D atom probe and neutron scattering experiments. |
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arXiv:1102.1091v1; 6 pages, 5 figures, PTM 2010 |
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NU @ karnesky @ |
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11018 |
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Brechet, Yves; Martin, Georges |
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Nucleation problems in metallurgy of the solid state: recent developments and open questions |
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Journal Article |
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2006 |
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Comptes Rendus Physique |
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7 |
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9-10 |
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959-976 |
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Coherent precipitation; Recrystallisation; Precipitation coherente; Recristallisation |
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Nucleation processes play a key role in the microstructure evolution of metallic alloys during thermomechanical treatments. These processes can involve phase transformations (such as precipitation) and structural instabilities (such as recrystallisation). Although the word `nucleation' is used in both cases, the situation is profoundly different for precipitation and for recrystallisation on which this article is focussed. In the case of precipitation, species are conserved and the underlying physics is stochastic fluctuations, allowing the apparition of critical germs of the new phase. In the case of recrystallisation, the underlying physical phenomenon is the progressive growth of subgrain structures leading to an unstable configuration, allowing a dislocation free grain to grow at the expense of a dislocated one. The two cases require different types of modelling which are presented in the article. To cite this article: Y. Brechet, G. Martin, C. R. Physique 7 (2006). |
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NU @ karnesky @ |
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9593 |
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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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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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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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Devel, M.; Girard, C.; Joachim, C.; Martin, F., O J |
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Field induced manipulation of fullerene molecules with the STM: a self-consistent theoretical study |
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Journal Article |
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1995 |
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Applied Surface Science |
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Appl. Surf. Sci. |
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87/88 |
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390-397 |
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Scanning Tunnelling Microscopy |
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2670 |
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Deconihout, B.; Saint-Martin, R.; Jamot, C.; Bostel, A. |
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Improvement of the mass resolution of the atom probe using a dual counter-electrode |
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Journal Article |
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2003 |
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Ultramicroscopy |
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95 |
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239-249 |
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9199 |
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Miller, M. K.; Russell, K. F.; Martin, P. M.; Busch, R.; Johnson, W. L. |
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Characterization of bulk metallic glasses with the atom probe |
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Journal Article |
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1996 |
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Journal de Physique IV |
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J. de Phys. IV |
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6-C5 |
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217-222 |
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Atom Probe Field Ion Microscopy |
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2142 |
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