Simulating the Solidification of Boride–Boride Eutectics
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Computer simulations of structurization in boride–boride ceramics are performed using the standard version of phase-field theory. The simulations reproduce the main properties of eutectic structures observed in experiments, i.e., spatial segregation of components, structure formation from an overcooled melt, and complete decomposition of the system when relaxes toward thermodynamic equilibrium. The eutectic colonies formed in the process of directional solidification and the dependence of spatial parameter of the emerging structures on the solidification rate are reproduced as well. The simulations demonstrate that the ordered fibrous structures are formed only in a certain range of solidification rates.
Keywordseutectic boride ceramics directional solidification structure formation phase-field theory
The authors are grateful to EOARD for financial support of this research effort under project 118003.
- 1.Y. B. Paderno, V. N. Paderno, V. B. Filippov, et al., “Structure features of the eutectic alloys of borides with the d- and f-transition metals,” Powder Metall. Met. Ceram., 31, No. 8, 700–706 (1992).Google Scholar
- 2.Y. B. Paderno, “A new class of in-situ fiber reinforced boride composite ceramic materials,” in: Y. M. Haddad (ed.), Proc. NATO Advanced Research Workshop Advanced Multilayered and Fibre-Reinforced Composites, Springer (1998), Vol. 43, pp. 353–369.Google Scholar
- 4.Hongqi Deng, Study of the Interface Behavior in Directionally Solidified LaB 6 –ZrB 2 Eutectics, PhD Thesis, The Pennsylvania State University (2006), p. 194.Google Scholar
- 5.P. I. Loboda, Directionally Solidified Borides [in Russian], Praimdruk, Kyiv (2012), p. 394.Google Scholar
- 8.A. Pasturel, Emre S. Tasci, Marcel H. F. Sluiter, and N. Jakse, “Structural and dynamic evolution in liquid Au–Si eutectic alloy by ab initio molecular dynamics,” Phys. Rev., B81, 140202 (R) (2010).Google Scholar
- 15.N. D. Nyashina and P. V. Trusov, “On potential application of the phase-field model to describe the structure of melt solidification front,” Mat. Model. Sist. Prots., No. 7, 57–66 (1999).Google Scholar
- 17.B. Bokhonov and M. Korchagin, “In situ investigation of stage of the formation of eutectic alloys in Si–Au and Si–Al systems,” J. Alloys Compd., 312, 238–250 (2000).Google Scholar
- 20.M. Apel, B. Boettger, H.-J. Diepers, and I. Steinbach, “2D and 3D phase-field simulations of lamella and fibrous eutectic growth,” J. Cryst. Growth, 237–239, 154–158 (2002).Google Scholar