Phase field modeling of rapid resolidification of Al-Cu thin films

Tatu Pinomaa*, Joseph McKeown, Jörg Wiezorek, Nikolas Provatas, Anssi Laukkanen, Tomi Suhonen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

40 Citations (Scopus)

Abstract

A binary alloy multi-order parameter phase field model is used to study rapid solidification in Al-Cu under conditions corresponding to recent dynamic transmission electron microscopy (DTEM) experiments. The phase field model's sharp interface limit is set through a recent matched asymptotic analysis to follow the solute trapping and interface undercooling kinetics of the Continuous Growth Model (CGM). The phase field model convergence to the CGM sharp interface model is investigated, and based on this an optimal interface width is chosen to simulate the DTEM experimental conditions. The temperature distribution used in the phase field simulations is taken from an analytic expression extracted from experiments. Simulated solidification structures are compared to experiments, including time-resolved DTEM images and post-mortem TEM-based image quality and orientation maps. We find that the large scale morphological features of the simulated microstructures are in good agreement with the experiments, and the corresponding concentration profiles that emerge are in qualitative agreement with experiments. These results show that phase field simulations, informed with DTEM experiments, provides a promising framework to investigate rapidly solidified microstructure evolution and solute segregation, and to calibrate hard-to-determine solidification parameters.

Original languageEnglish
Article number125418
JournalJournal of Crystal Growth
Volume532
DOIs
Publication statusPublished - 15 Feb 2020
MoE publication typeA1 Journal article-refereed

Funding

This work was supported by Academy of Finland , through HIERARCH project, Grant No. 318065. NP wishes to acknowledge the National Science and Engineering Research Council of Canada, and the Canada Research Chairs for support with this project. Work at Lawrence Livermore National Laboratory (LLNL) was performed under the auspices of the U.S. Department of Energy by LLNL under Contract No. DE-AC52-07NA27344. Portions of this work were supported by the Laboratory Directed Research and Development (LDRD) Program at LLNL under project tracking code 18-SI-003. Work performed at the University of Pittsburgh received support from the National Science Foundation , Division of Materials Research, Metals & Metallic Nanostructures program , through Grant No. DMR 1607922.

Keywords

  • characterization
  • computer simulation
  • crystal morphology
  • segregation
  • alloys

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