Phase-field simulation of the microstructure evolution in the eutectic NiAl-34Cr system

[Display omitted] •Modeling of the eutectic system NiAl-34Cr with phase-field simulations based on the Grand potential approach.•Two- as well as three-dimensional large-scale phase-field simulations for three different velocities.•Comparison of simulation results with analytical theory of Jackson an...

Full description

Saved in:
Bibliographic Details
Published in:Computational materials science 2017-02, Vol.128, p.379-387
Main Authors: Kellner, Michael, Sprenger, Ioannis, Steinmetz, Philipp, Hötzer, Johannes, Nestler, Britta, Heilmaier, Martin
Format: Article
Language:English
Subjects:
Aluminides
Computer simulation
Directional solidification
Evolution
Intermetallic compounds
Intermetallics
Jackson-Hunt analysis
Mathematical analysis
Microstructure
NiAl-34Cr
Nickel base alloys
Nickel compounds
Phase-field simulation
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:[Display omitted] •Modeling of the eutectic system NiAl-34Cr with phase-field simulations based on the Grand potential approach.•Two- as well as three-dimensional large-scale phase-field simulations for three different velocities.•Comparison of simulation results with analytical theory of Jackson and Hunt in 2D and 3D.•The simulations of all considered velocities match well with the analytic approach.•Large-scale simulations are found to be in good qualitative and quantitative accordance with experimental results. The directionally solidified eutectic alloy NiAl-34Cr possesses promising properties for structural applications at high temperatures, such as increased creep resistance compared to the stoichiometric NiAl, while keeping the excellent oxidation behavior of the binary intermetallic compound. As microstructure and material properties are usually closely linked together, a deeper understanding of the microstructure evolution is crucial to design materials with defined properties. To simulate the eutectic reaction during directional solidification (DS), a thermodynamically consistent phase-field model based on the Grand potential approach is applied. Two- and three-dimensional simulations of the DS process for three different growth velocities are performed. The evolving microstructures obtained from large-scale simulations are presented and compared with micrographs from scanning electron microscopy (SEM) as well as with the analytic Jackson-Hunt approach in 2D and 3D. The simulation results are in qualitative and quantitative accordance with both, DS experiments and analytical solutions.
ISSN:0927-0256
1879-0801
DOI:10.1016/j.commatsci.2016.11.049