Radiation-induced mixing between metals of low solid solubility
Author(s)
Zhang, Liang; Demkowicz, Michael J.
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We use molecular dynamics to study radiation-induced mixing between low solid solubility metals, focusing on the effect of liquid phase properties, by sequentially performing multiple 10 keV collision cascade simulations up to a total dose of ∼5 displacements per atom (dpa). We find mixing to be proportional to the square root of dose, independent of interface crystallography, and highly sensitive to liquid phase interdiffusivity. It occurs primarily by liquid phase interdiffusion in thermal spikes rather than by ballistic displacements. Partial de-mixing is also seen within thermal spikes, regardless of liquid phase solubility. We attribute it to segregation of impurities into the liquid core of the thermal spikes. We present an expression that relates mixing rates to liquid phase heats of mixing and self-diffusivities.
Date issued
2014-06Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and EngineeringJournal
Acta Materialia
Publisher
Elsevier
Citation
Zhang, L., and M. J. Demkowicz. “Radiation-Induced Mixing Between Metals of Low Solid Solubility.” Acta Materialia 76 (September 2014): 135-150.
Version: Author's final manuscript
ISSN
13596454