ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarPusztai TamásHUN-REN Wigner RCP SZFIPhase-field modeling of 
directional melting of lamellar and rod eutectic structuresTuesday, 12 
November 2024, 10:00, KFKI Campus, Bldg. 1, 2nd floor, Conference RoomBy 
inverting the pulling direction of the sample in a directional solidification 
setup, the melting of lamellar and rod eutectic structures can be studied. In 
the work to be presented, we used phase-field modeling to determine the 
melting forms of a simple binary model alloy. For samples where the mean 
composition of the initial solid structure is equal to the eutectic 
composition, we observed near-planar melting fronts, in agreement with the 
predictions of a slightly modified Jackson-Hunt analysis. However, if the 
mean solid composition is off-eutectic, the two solids melt at different 
positions in the temperature gradient: the phase which is present in a 
higher-than-eutectic phase fraction melts at its liquidus temperature 
corresponding to the off-eutectic mean composition, while the other phase 
melts at the eutectic temperature. The steady-state melting shapes were 
obtained either by taking the long-time solutions of the dynamical equations 
of the model, or by solving the time-independent partial differential 
equations in a reference frame moving with the front. In some cases, 
non-steady state phenomena, such as oscillations around the trijuction or 
spherodization could also be observed. Minden érdeklődőt szívesen 
látunk! - Everyone is welcome to attend.Attila Nagysem-admin AT szfki.hu