What is the Relevance of Thermal Fluctuations for the Spinodal Decomposition in a Coherent Metal-Hydrogen System?
In order to provide an answer to the title question, we examined the dynamics of unstable hydrogen density modes within the framework of a stochastic theory which describes the coupling of the hydrogen density to their atomic environment. We find that the thermal fluctuations could be a dominant mechanism inducing the spinodal decomposition. Point defects could play the role of a inhomogeneous decomposition mechanism; however, we find their role to be minimal in the decomposition process. Experiments are proposed to determine the validity of our calculations and explicit results are presented based upon the well studied niobium-hydrogen system.
KeywordsThermal Fluctuation Spinodal Decomposition Hydrogen Density Yield Stress Material Density Amplitude
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