Publications de Alain Jacot | EPFL Graph Search

Numerical Simulation of Solidification, Homogenization, and Precipitation in an Industrial Ni-Based Superalloy

Alain Jacot, Charles-André Gandin, Luc Rougier

A comprehensive simulation approach integrating solidification, homogenization, and precipitation during aging has been used to predict the formation of gamma/gamma' microstructures in the AM1 nickel-based superalloy. The particle size distribution of intr ...

Springer2016

Multiphase-Field Modeling of Micropore Formation in Metallic Alloys

Alain Jacot, Michel Rappaz, Hossein Meidani

A 3D phase-field (PhF) model has been developed to study the formation of micropores constrained to grow within a well-developed solid network. The model accounts for the equilibrium condition at triple (solid-liquid-pore) lines and the partitioning of dis ...

Springer Verlag2015

Atom probe tomography of secondary gamma ' precipitation in a single crystal Ni-based superalloy after isothermal aging at 1100 degrees C

Alain Jacot, Charles-André Gandin, Luc Rougier

Secondary gamma' precipitation in a commercial single crystal Ni-based superalloy after the 1100 degrees C isothermal aging has been investigated by atom probe tomography. After the isothermal aging for 300 s, 1800 s and 3600 s, a bimodal size distribution ...

Elsevier2014

Numerical simulation of AM1 microstructure

Alain Jacot, Charles-André Gandin, Luc Rougier, Paolo Di Napoli

A modelling approach is developed for the description of microstructure formation in the industrial AM1 Ni-base superalloy. Solidification and homogenization simulations are first carried out using a microsegregation model, before using the local compositi ...

E D P Sciences2014

Numerical simulation of precipitation in multicomponent Ni-base alloys

Alain Jacot, Charles-André Gandin, Luc Rougier, Paolo Di Napoli

A comprehensive particle size distribution model has been developed for the simulation of gamma' precipitation in multicomponent Ni alloys. Nucleation, growth and coarsening of the precipitates are described by a particle size distribution. The growth rate ...

Elsevier2013

Numerical simulation of microstructure formation during solidification and heat treatments of Ni-base superalloys

Alain Jacot, Charles-André Gandin, Luc Rougier, Paolo Di Napoli

A comprehensive modelling approach has been developed for the simulation of microstructure formation during solidification and heat treatment in Ni-base superalloys. The microsegregation taking place during solidification is simulated using the pseudo-fron ...

2012

3D Phase-Field Simulation of Micropore Formation during Solidification: Morphological Analysis

Alain Jacot, Michel Rappaz, Hossein Meidani

A 3D multiphase-field (PhF) model has been developed in order to study the formation of a micropore constrained to grow in a solid network (i.e., pinching effect). The model accounts for the pressure difference due to capillarity between liquid and gas, th ...

Iop Publishing Ltd2012

Three-dimensional phase-field simulation of micropore formation during solidification: Morphological analysis and pinching effect

Alain Jacot, Jean-Luc Desbiolles, Michel Rappaz, Hossein Meidani

A three-dimensional (3-D) multiphase-field model has been developed in order to study the formation of a micropore constrained to grow in a solid network (i.e. pinching effect). The model accounts for the pressure difference due to capillarity between liqu ...

Elsevier2012

Solute trapping-free massive transformation at absolute stability

Alain Jacot, Wilfried Kurz

Directional transformation of a hypo-peritectic Fe–17.5 at.% Co alloy was studied. Two consecutive phase transformations—solidification (liquid to delta ferrite) and solid-state transformation (δ ferrite to γ austenite)—were observed and compared with theo ...

Elsevier2011

Thermodynamic assessment of the Cu-Ge binary system

Alain Jacot, Shan Jin, Christian Leinenbach, Jian Wang

The Cu-Ge binary system was assessed thermodynamically using the CALPHAD method through Thermocalc (R) software package based on the evaluation of all available experimental data from the published literature. The solution phases, including liquid, fcc, hc ...

Elsevier2010

Phase-field simulations of alpha -> gamma precipitations and transition to massive transformation in the Ti-Al alloy

Alain Jacot

A phase-field model for the solid-solid alpha -> gamma transition of Ti-Al binary alloys is presented based on analytical Gibbs free energies and couplings to the thermodynamical database ThermoCalc. The equilibrium values recover the alpha + gamma phase b ...

Elsevier2009

A Phase Field Model For A Geometrical Description Of Micropores Constrained By A Solid Network

Alain Jacot, Milan Felberbaum

A 2D phase field model has been developed to describe the shape of a pore formed within interdendritic liquid channels. The influence of the solid, which can force the pore to adopt a non-spherical shape, is taken into account through the geometry of the d ...

Minerals, Metals & Materials Soc, 184 Thorn Hill Rd, Warrendale, Pa 15086-7514 Usa2009

Phase-field simulation of micropores constrained by a solid network

Alain Jacot, Milan Felberbaum, Hossein Meidani

A 2D phase-field model has been developed in order to describe the morphology of a pore forming within interdendritic liquid channels and the geometrical effect of mechanical contacts with neighboring solid. The distribution of the solid, liquid and gas ph ...

Springer, Springer-Verlag2009

EBSD: a powerful microstructure analysis technique in the field of solidification

Alain Jacot, Michel Rappaz, Christoph Niederberger, Emmanuelle Boehm Courjault, Aurèle Mariaux, Mario Alberto Salgado Ordorica

This paper presents a few examples of the application of electron back-scatter diffraction (EBSD) to solidification problems. For directionally solidified Al-Zn samples, this technique could reveal the change in dendrite growth directions from < 100 > to < ...

2009

Origin of intragranular crystallographic misorientations in hot-dip Al-Zn-Si coatings

Alain Jacot, Johann Michler, Christoph Niederberger

The origin of intragranular variations of the crystallographic orientation in hot-dip Al-Zn-Si coatings is discussed based on new experimental results and modelling. The solidification microstructure in as-received 55Al-43.4Zn-l.6Si (in wt.%) coatings depo ...

Elsevier2008

A numerical model for the description of the lamellar and massive phase transformations in Ti-Al-Nb alloys

Alain Jacot, Amin Rostamian

A phenomenological modelling approach has been developed for the description of die massive and lamellar microstructures which form in gamma-TiAl alloys at high and moderate cooling rates, respectively. The nucleation of both massive and lamellar gamma is ...

Minerals, Metals & Materials Soc, 184 Thorn Hill Rd, Warrendale, Pa 15086-7514 Usa2008

A numerical model for the description of the lamellar and massive phase transformations in TiAl alloys

Alain Jacot, Amin Rostamian

A phenomenological modelling approach has been developed to describe the massive transformation and the formation of lamellar microstructures during cooling in binary gamma titanium aluminides. The modelling approach is based on a combination of nucleation ...

Elsevier2008

Laser Repair of Superalloy Single Crystals with Varying Substrate Orientations

Cyrille Bezençon, Alain Jacot, Wilfried Kurz, Sélim Mokadem, Aude Hauert

Springer, Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com2007