Publications de Jonathan Dantzig

Growth of Secondary Dendrite Arms of Fe C Alloy during Transient Directional Solidification by Phase-field Method

Due to the variations in the local solidification conditions in typical industrial casting processes, dendrites grow under transient rather than steady-state conditions. In this study, the phase-field method was used to study the evolution of secondary den ...

Iron Steel Inst Japan Keidanren Kaikan2014

Multiscale, Multiphysics Numerical Modeling of Fusion Welding with Experimental Characterization and Validation

Jonathan Dantzig, Jun Liu, Yu Xie

Various physical interfacial phenomena occur during the process of welding and influence the final properties of welded structures. As the features of such interfaces depend on physics that resolve at different spatial scales, a multiscale and multiphysics ...

Springer Verlag2013

Modeling of peritectic coupled growth in Cu-Sn alloys

Michel Rappaz, Jonas Valloton, Jonathan Dantzig

In directional solidification experiments on hypoperitectic Cu-Sn alloys at low velocity and high thermal gradient, both lamellar and fibrous coupled peritectic growth patterns have been observed. Two phenomena that had not been observed in previous experi ...

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

Using the interface Peclet number to select the maximum simulation interface width in phase-field solidification modelling

Jonathan Dantzig

This study investigates the use of interface Peclet number P = w/(D-l/V-tip), to determine the interface width (w) used in phase-field simulations, where D-l is the liquid diffusivity and V-tip is the tip velocity. The maximum simulation interface width (w ...

Elsevier2013

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

A mesoscale granular model for the mechanical behavior of alloys during solidification

Michel Rappaz, Stéphane Vernède, Jonathan Dantzig

We present a two-dimensional granular model for the mechanical behavior of an ensemble of globular grains during solidification. The grain structure is produced by a Voronoi tessellation based on an array of predefined nuclei. We consider the fluid flow ca ...

Elsevier2009