Abstract
This study investigates the spinodal decomposition dynamics in binary mixtures containing mobile particles by combining the Cahn–Hilliard equation with Langevin dynamics for particles with Brownian motion changes proportional to their mobility. We solve the Cahn–Hilliard equation numerically using a semi-implicit Fourier spectral method, and show that the domain growth rate first increases with the increase in particle mobility, and then decreases. The effect of filler particle concentration on the domain growth depends on its mobility: when the particle mobility is low, the domain growth rate decreases with the increase in particle concentration; whereas when the particle mobility is high, the domain growth rate decreases and then increases and finally decreases again with the increase in particle concentration. The proposed model suggests the possibility of controlling macroscopic behaviour of binary alloys by altering filler particle properties.
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Acknowledgements
This work was partially supported by the National Natural Science Foundation of China (Grant No. 51472015).
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Guangjin, L., Wenjun, X., Lanzhou, L. et al. Phase separation dynamics in binary systems containing mobile particles with variable Brownian motion. Pramana - J Phys 91, 55 (2018). https://doi.org/10.1007/s12043-018-1625-y
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DOI: https://doi.org/10.1007/s12043-018-1625-y