Attempts in Dendrite Growth on Single Grain Ni-alloy
Claude De Lamater-Brotherton
Bredesen Center UT-ORII, University of Tennessee
This page shows a simulation of freezing Ni-Al-Co-Cr. This visualization was created by Claude De Lamater-Brotherton in the Bredesen Center UTK and High Temperature Corrosion Group in the MS&T Division at the Oak Ridge National Laboratory.
Ni based superalloys used in modern turbine blade design gain additional strength from the introduction of dendrites into the microstructure. These tree-like structures develop when the alloy freezes along the <001> direction. The below simulation is the result of attempting to replicate the conditions necessary for dendrite growth. The simulation was broken into regions. The hot region was at 1650 degC. This was at or slightly above the melting temperature. The opposite side of the simulation cell was kept at at temperature of 1000 degC to act as a directional thermal gradient. 1
Interactive Structures
Color Legend:
- White = Nickel
- Blue = Aluminum
- Purple = Cobolt
- Green = Chromium
References
1. K. BoHung. "LAAMPS-Molecular Dynamics Tutorial." https://sites.google.com/site/bohungkim/8-molecular-dynamics-tutorial (accessed 05/01/2024, 2024).
2. D. Farkas and A. Caro, "Model interatomic potentials for Fe-Ni-Cr-Co-Al high-entropy alloys," JOURNAL OF MATERIALS RESEARCH, vol. 35, no. 22, pp. 3031-3040, NOV 30 2020, doi: 10.1557/jmr.2020.294.
3. S. S. Hu et al., "Orientation Control for Nickel-Based Single Crystal Superalloys: Grain Selection Method Assisted by Directional Columnar Grains," MATERIALS, vol. 15, no. 13, JUL 2022, Art no. 4463, doi: 10.3390/ma15134463.
4. M. Papanikolaou, K. Salonitis, and M. Jolly, "Molecular Dynamics Simulations of the Solidification of Pure Aluminium," presented at the LIGHT METALS 2020, 2020.
5. J. Q. Xi, F. Yang, X. Zhang, and H. F. Zhou, "Effect of geometry of crystalline dendrite on the uniaxial tension behavior of metallic glass matrix composites based on molecular dynamics simulations," MATERIALS TODAY COMMUNICATIONS, vol. 37, DEC 2023, Art no. 107229, doi: 10.1016/j.mtcomm.2023.107229.
6. C. Yang, L. Liu, X. Zhao, Y. Li, J. Zhang, and H. Fu, "Dendrite morphology and evolution mechanism of nickel-based single crystal superalloys grown along the <001> and <011> orientations," Progress in Natural Science: Materials International, vol. 22, no. 5, pp. 407-413, 2012/10/01/ 2012, doi: https://doi.org/10.1016/j.pnsc.2012.10.001.
posted: May 2024.
updated: May 2024.