Gerard Leyson
Max Planck Society
Ferrite (iron)Solid solutionStrain rateDensity functional theoryDislocationChemical physicsFlow stressMartensiteField (physics)MetallurgyMaterials scienceCondensed matter physicsAlloyHydrogenFunction (mathematics)Molecular dynamicsCrystallographyFermi gasStress (mechanics)Hydrogen embrittlementAusteniteThermodynamicsScaling
15Publications
11H-index
745Citations
Publications 15
Newest
#1Céline Varvenne (AMU: Aix-Marseille University)H-Index: 15
#2Gerard Leyson (MPG: Max Planck Society)H-Index: 11
Last. William A. Curtin (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 81
view all 4 authors...
Abstract Random solid solution alloys are a broad class of materials that are used across the entire spectrum of engineering metals, whether as stand-alone materials (e.g. Al-5xxx alloys) or as the matrix in precipitate-strengthening materials (e.g. Ni-based superalloys). As a result, the mechanisms of, and prediction of, strengthening in solid solutions has a long history. Many concepts have been developed and important trends identified but predictive capability has remained elusive. In recent...
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#1A. Kwiatkowski da Silva (MPG: Max Planck Society)H-Index: 6
#2Gerard Leyson (MPG: Max Planck Society)H-Index: 11
Last. Dierk Raabe (MPG: Max Planck Society)H-Index: 140
view all 9 authors...
Abstract We investigated a high-purity cold-rolled martensitic Fe-9wt%Mn alloy. Tensile tests performed at room temperature after tempering for 6 h at 450 °C showed discontinuous yielding. Such static strain ageing phenomena in Fe are usually associated with the segregation of interstitial elements such as C or N to dislocations. Here we show by correlative transmission electron microscopy (TEM)/atom probe tomography (APT) experiments that in this case Mn segregation to edge dislocations associa...
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#1Dierk Raabe (MPG: Max Planck Society)H-Index: 140
#2Dirk Ponge (MPG: Max Planck Society)H-Index: 43
Last. Stefanie Sandlöbes (RWTH Aachen University)H-Index: 28
view all 14 authors...
#1Dirk Ponge (MPG: Max Planck Society)H-Index: 43
#2Meimei Wang (MPG: Max Planck Society)H-Index: 5
Last. Dierk Raabe (MPG: Max Planck Society)H-Index: 140
view all 14 authors...
#1Hyun Seok Oh (MPG: Max Planck Society)H-Index: 9
#2Duancheng Ma (MPG: Max Planck Society)H-Index: 17
Last. Dierk Raabe (MPG: Max Planck Society)H-Index: 140
view all 7 authors...
Lattice distortions constitute one of the main features characterizing high entropy alloys. Local lattice distortions have, however, only rarely been investigated in these multi-component alloys. We, therefore, employ a combined theoretical electronic structure and experimental approach to study the atomistic distortions in the FeCoNiCrMn high entropy (Cantor) alloy by means of density-functional theory and extended X-ray absorption fine structure spectroscopy. Particular attention is paid to el...
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#1Gerard Leyson (MPG: Max Planck Society)H-Index: 11
#2William A. Curtin (École Polytechnique)H-Index: 81
The high temperature behavior of solute strengthening has previously been treated approximately using various scaling arguments, resulting in logarithmic and power-law scalings for the stress-dependent energy barrier Delta E(tau) versus stress tau. Here, a parameter-free solute strengthening model is extended to high temperatures/low stresses without any a priori assumptions on the functional form of Delta E(tau). The new model predicts that the well-established low-temperature, with energy barr...
Source
#1Gerard Leyson (MPG: Max Planck Society)H-Index: 11
#2Blazej Grabowski (MPG: Max Planck Society)H-Index: 33
Last. Jörg Neugebauer (MPG: Max Planck Society)H-Index: 90
view all 3 authors...
Abstract A multiscale approach is proposed to predict how the presence of hydrogen influences the onset of homogeneous dislocation nucleation (HDN) and thus of plasticity. The model takes inputs that can be solely obtained from atomistic calculations, such as dislocation core structure, stacking fault energy and hydrogen–hydrogen interaction. The equilibrium hydrogen concentration around the dislocation loop is calculated using a recently developed self-consistent iterative method [1]. The compl...
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#1Gerard Leyson (MPG: Max Planck Society)H-Index: 11
#2William A. Curtin (École Polytechnique)H-Index: 81
The temperature-dependent flow behavior in nominally binary Al-Mg alloys measured recently (Jobba etal., 2015; Niewczas et al., 2015) is interpreted in the context of a parameter-free solute strengthening model. The recent measurements show consistently higher strengths as compared to literature data on true binary Al-Mg alloys, which is attributed to the presence of Fe in the nominally binary Al-Mg. Using the Fe concentration as a single fitting parameter, the model predictions for the newer ma...
Source
#1Gerard Leyson (MPG: Max Planck Society)H-Index: 11
#2Blazej Grabowski (MPG: Max Planck Society)H-Index: 33
Last. Jörg Neugebauer (MPG: Max Planck Society)H-Index: 90
view all 3 authors...
Abstract The interaction of hydrogen with the core and the strain field of edge dislocations is studied using a multiscale approach. We have therefore developed a combined thermodynamic and analytical model with full atomistic resolution that allows to quantify the local hydrogen concentration around the dislocation core as a function of temperature and hydrogen chemical potential. This model takes, as input, information from atomistic calculations, such as hydrogen–hydrogen interaction and the ...
Source
#1Pratheek Shanthraj (MPG: Max Planck Society)H-Index: 17
#2Haiming Zhang (MPG: Max Planck Society)
Last. Jörg Neugebauer (MPG: Max Planck Society)H-Index: 90
view all 7 authors...
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