https://doi.org/10.1140/epjp/i2011-11096-6
Regular Article
Investigation of the heterogeneous nucleation in a peritectic AlNi alloy
1
Materials and Process Simulation, University of Bayreuth, Bayreuth, Germany
2
Institute for Metallurgy, Clausthal University of Technology, 38678, Clausthal-Zellerfeld, Germany
3
Institute of Mineral Engineering (GHI), RWTH Aachen University, Aachen, Germany
* e-mail: julia.kundin@uni-bayreuth.de
Received:
8
June
2011
Revised:
17
June
2011
Accepted:
22
September
2011
Published online:
19
October
2011
The goal of this research is a systematic investigation aiming at a quantitative understanding of the four different stages of peritectic solidification: 1) heterogeneous nucleation, 2) peritectic reaction, 3) peritectic transformation and 4) direct growth of the peritectic phase. Solidification experiments of the peritectic alloy Al-36wt.% Ni are carried out in differential scanning calorimetry (DSC), and the recently developed multi-phase-field techniques are employed to quantitatively model and simulate the peritectic phase transformation, by taking into account the precise thermodynamic description of the Al-Ni system. A previously developed phase-field model that had been successfully employed in the Al-Ni system is adapted here and calibrated by a novel method that simulates not only the final solidification microstructure but also DSC traces. The resulting kinetics of the phase-transformation processes are presented underlying the above four stages of phase transformation in detail.
© Società Italiana di Fisica and Springer-Verlag Berlin Heidelberg, 2011
