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Type Martin, G.
  Publication The Joint Research Program ?CPR Precipitation?: - Breakthroughs in the Understanding of Kinetic Pathways for the Early Stages of Phase Separation Volume Journal Article
Pages (down) 2006
  Abstract Advanced Engineering Materials  
  Corporate Author The Joint Research Program ?CPR Precipitation?  
Publisher 8  
Editor 12
  Summary Language 1222-1224 Series Editor  
Abbreviated Series Title No abstract.
  Series Issue ISSN  
Medium
  Expedition Notes  
Call Number  
Contribution Id  
Serial URL ISBN  
1527-2648 no NU @ karnesky @ Martin2006 1854
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Wu, Ling-Mei; Seyring, Martin; Rettenmayr, Markus; Wang, Wen-Hsiung Characterization of precipitate evolution in an artificially aged Al-Zn-Mg-Sc-Zr alloy Journal Article 2010 Materials Science and Engineering: A 527 1068-1073 Al-Zn-Mg-Sc-Zr alloy; age hardening; precipitation; transmission electron microscopy (TEM) 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]â 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]â phase which precipitates on the 111Al plane. The transformation from [eta]â 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]â 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]â formed during subsequent ageing. 0921-5093 no NU @ karnesky @ Wu2009 10688
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Martinez, E.; Fu, C.-C.; Levesque, M.; Nastar, M.; Soisson, F. Simulations of decomposition kinetics of Fe-Cr solid solutions during thermal aging Journal Article 2011 Solid State Phenomena 172-174 1016 cond-mat.mtrl-sci; cond-mat.stat-mech; physics.comp-ph 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. arXiv:1102.1091v1; 6 pages, 5 figures, PTM 2010 no NU @ karnesky @ 11018
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Brechet, Yves; Martin, Georges Nucleation problems in metallurgy of the solid state: recent developments and open questions Journal Article 2006 Comptes Rendus Physique 7 9-10 959-976 Coherent precipitation; Recrystallisation; Precipitation coherente; Recristallisation 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). no NU @ karnesky @ 9593
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Soisson, F.; Martin, G. Kinetics of Decomposition of Metastable Solid Solutions: Comparison between Monte Carlo Simulations and Classical Theories Book Chapter 1999 Proceedings of the International Conference on Solid-Solid Phase Transformations 757-760 precipitation, nucleation, incubation time, Monte Carlo simulations 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). no NU @ karnesky @ 276
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Clouet, Emmanuel; Nastar, Maylise; Barbu, Alain; Sigli, Cristophe; Martin, Geroges Precipitation in Al-Zr-Sc alloys:a comparison between kinetic Monte Carlo, cluster dynamics and classical nucleation theory Book Chapter 2005 Solid-Solid Phase Transformations in Inorganic Materials 2 683-703 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. TMS Howe, J. M.; Laughlin, D. E.; Lee, J. K.; Dahmen, U.; Soffa, W. A. no NU @ karnesky @ 166
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Athenes, M.; Soisson, F.; Bellon, P.; Martin, G. Solid State Diffusion and Configurational Kinetics Book Chapter 1999 Proceedings of the International Conference on Solid-Solid Phase Transformations 433-440 precipitation, ordering, nucleation, growth, coarsening, diffusion, vacancy, atomic scale, Monte Carlo simulation, kinetics no NU @ karnesky @ 277
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Devel, M.; Girard, C.; Joachim, C.; Martin, F., O J Field induced manipulation of fullerene molecules with the STM: a self-consistent theoretical study Journal Article 1995 Applied Surface Science Appl. Surf. Sci. 87/88 390-397 Scanning Tunnelling Microscopy no 2670
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Deconihout, B.; Saint-Martin, R.; Jamot, C.; Bostel, A. Improvement of the mass resolution of the atom probe using a dual counter-electrode Journal Article 2003 Ultramicroscopy 95 239-249 no 9199
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Miller, M. K.; Russell, K. F.; Martin, P. M.; Busch, R.; Johnson, W. L. Characterization of bulk metallic glasses with the atom probe Journal Article 1996 Journal de Physique IV J. de Phys. IV 6-C5 217-222 Atom Probe Field Ion Microscopy no 2142
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