Publications de Paolo Di Napoli

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

Dendritic Growth Morphologies in Al-Zn Alloys-Part I: X-ray Tomographic Microscopy

Michel Rappaz, Jonathan Friedli, Paolo Di Napoli

Upon solidification, most metallic alloys form dendritic structures that grow along directions corresponding to low index crystal axes, e.g., directions in fcc aluminum. However, recent findings[1,2] have shown that an increase in the zinc content in Al-Zn ...

Springer Verlag2013

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

Dendritic Growth Morphologies in Al-Zn Alloys-Part II: Phase-Field Computations

Michel Rappaz, Jonathan Friedli, Paolo Di Napoli, Jonathan Dantzig

In Part I of this article, the role of the Zn content in the development of solidification microstructures in Al-Zn alloys was investigated experimentally using X-ray tomographic microscopy. The transition region between dendrites found at low Zn content a ...

Springer Verlag2013

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

X-ray tomographic microscopy analysis of the dendrite orientation transition in Al-Zn

Michel Rappaz, Jonathan Friedli, Paolo Di Napoli

Recently, Gonzales and Rappaz [Met. Mat. Trans. A37:2797, 2006] showed the influence of an increasing zinc content on the growth directions of aluminum dendrites. < 100 > and < 110 > dendrites were observed below 25wt.% and above 55wt.% zinc, respectively, ...

Iop Publishing Ltd2012

Phase-field modeling of the dendrite orientation transition in Al-Zn alloys

Michel Rappaz, Jonathan Friedli, Jonathan Dantzig, Paolo Di Napoli

With a few exceptions, phase-field simulations of dendritic growth in cubic materials have been modeled using simple expressions for the interfacial energy anisotropy and with strong anisotropy. However, recent experimental results show that the Dendrite O ...

Iop Publishing Ltd2012