Simultaneous and sequential transformations with nucleation at preferred sites
André Luiz Moraes Alves, Felipe da Silva Siqueira, Paulo Rangel Rios
Resumo
The advent of new materials may increase transformations that involve two or more product phases. This transformation involving two or more product phases may occur simultaneously or sequentially. It is well-known that heterogeneous nucleation has advantages over homogeneous nucleation. Several sites may become preferred because they favor heterogeneous nucleation. The interface of precipitates and the grain boundaries are one of the preferred locations for nucleation. We model simultaneous and sequential transformations nucleated at the preferred sites. This work employs both computer simulation and exact analytical solutions. Two product phases, 1 and 2, were considered. The product phase 1 nucleated at the matrix/particle interface and the product phase 2 nucleated at the grain boundaries. The analytical model showed an excellent agreement with simulation data. For each case, computer simulation obtained the microstructural evolution. We discussed the effect of nucleation at the preferred sites on the microstructure.
Palavras-chave
Referências
1 Rios PR, Villa E. Simultaneous and sequential transformations. Acta Materialia. 2011;59(4):1632-1643.
2 Alves ALM, Assis WLS, Rios PR. Computer simulation of sequential transformations. Acta Materialia. 2017;126:451-468.
3 Goetz RL. Particle stimulated nucleation during dynamic recrystallization using a cellular automata model. Scripta Materialia. 2005;52(9):851-856.
4 Barbaro FJ, Krauklis P, Easterling KE. Formation of acicular ferrite at oxide particles in steels. Materials Science and Technology. 2012;5(11):1057-1068.
5 Bott IS, Rios PR. On the effectiveness of inclusions as nucleation sites in weld deposits. Scripta Materialia. 1998;38(8):1269-1274.
6 Babu SS. The mechanism of acicular ferrite in weld deposits. Current Opinion in Solid State and Materials Science. 2004;8(3-4):267-278.
7 Humphreys FJ. The nucleation of recrystallization at second phase particles in deformed aluminium. Acta Metallurgica. 1977;25(11):1323-1344.
8 Jensen DJ, Hansen N, Humphreys FJ. Texture development during recrystallization of aluminium containing large particles. Acta Metallurgica. 1985;33(12):2155-2162.
9 Zhang Y, Jensen DJ, Zhang Y, Lin F, Zhang Z, Liu Q. Three-dimensional investigation of recrystallization nucleation in a particle-containing Al alloy. Scripta Materialia. 2012;67(4):320-323.
10 De Siqueira RP, Sandim HRZ, Raabe D. Particle stimulated nucleation in coarse-grained ferritic stainless steel. Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science. 2013;44(1):469-478.
11 Alves ALM, Villa E, Rios PR. Transformation kinetics for nucleation on second-phase particles: analytical solution and computer simulation. Acta Materialia. 2017;131:523-533.
12 Cahn JW. The time cone method for nucleation and growth kinetics on a finite domain. Sel Work John W Cahn. 2013;398:545-546.
13 Rios PR, Villa E. Transformation kinetics for inhomogeneous nucleation. Acta Materialia. 2009;57(4):1199-1208.
14 Chiu SN, Stoyan D, Kendall WS, Mecke J. Stochastic geometry and its applications. 3rd ed. Chichester: Wiley; 2013.
15 Johnson WA, Mehl RF. Reaction kinetics in processes of nucleation and growth. Transactions of the Metallurgical Society of AIME. 1939;135:416-441.
16 Avrami M. Kinetics of phase change. I: general theory. The Journal of Chemical Physics. 1939;7(12):1103-1112.
17 Kolmogorov AN. On the statistical theory of metal crystallization. Izvestiia Akademii Nauk SSSR. Seriia Biologicheskaia. 1937;1:335-359.
18 Cahn JW. The kinetics of grain boundary nucleated reactions. Acta Metallurgica. 1956;4(5):449-459.
19 Fonseca GD, Siqueira FS, Alves ALM, Assis WLS, Rios PR. Microstructural descriptors to characterize computer simulated microstructures generated by nucleation on a Kelvin polyhedra network. J Mater Res Technol. 2018;7(3):337-341.
Submetido em:
22/05/2022
Aceito em:
04/09/2022
Facebook
Google+
Twitter
LinkedIn
Mendeley
StumbleUpon
CiteULike
Reddit
Email