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Title: Cascades and spectra of a turbulent spinodal decomposition in two-dimensional symmetric binary liquid mixtures

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1324021
Grant/Contract Number:
FG02-04ER54738
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Fluids
Additional Journal Information:
Journal Volume: 1; Journal Issue: 5; Related Information: CHORUS Timestamp: 2016-09-12 18:08:59; Journal ID: ISSN 2469-990X
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Fan, Xiang, Diamond, P. H., Chacón, L., and Li, Hui. Cascades and spectra of a turbulent spinodal decomposition in two-dimensional symmetric binary liquid mixtures. United States: N. p., 2016. Web. doi:10.1103/PhysRevFluids.1.054403.
Fan, Xiang, Diamond, P. H., Chacón, L., & Li, Hui. Cascades and spectra of a turbulent spinodal decomposition in two-dimensional symmetric binary liquid mixtures. United States. doi:10.1103/PhysRevFluids.1.054403.
Fan, Xiang, Diamond, P. H., Chacón, L., and Li, Hui. 2016. "Cascades and spectra of a turbulent spinodal decomposition in two-dimensional symmetric binary liquid mixtures". United States. doi:10.1103/PhysRevFluids.1.054403.
@article{osti_1324021,
title = {Cascades and spectra of a turbulent spinodal decomposition in two-dimensional symmetric binary liquid mixtures},
author = {Fan, Xiang and Diamond, P. H. and Chacón, L. and Li, Hui},
abstractNote = {},
doi = {10.1103/PhysRevFluids.1.054403},
journal = {Physical Review Fluids},
number = 5,
volume = 1,
place = {United States},
year = 2016,
month = 9
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevFluids.1.054403

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  • The spinodal decomposition of the {beta} Ti-Cr binary alloys system is still questionable, because there are only rare experimental and thermodynamics data; moreover, simulation results for a real alloy system have not been found. Transmission electron microscopy (TEM) and quantitative computer simulations based on Khachaturyan`s diffusion equation have been employed to study the microstructural evolution occurring in the metastable {beta} Ti-Cr alloys. The study results reveal that the metastable {beta} Ti-Cr undergoes a phase separation reaction {beta} {yields} titanium rich ({beta}{sub 1}) + chromium rich ({beta}{sub 2}) through a spinodal decomposition. The coherent two-phase fields show extremely fine platelike precipitatesmore » distributed homogeneously through the bcc matrix, which are parallel to the {l_brace}100{r_brace} plane. Those precipitates are highly elastic induced from the first step of the phase separation. There is good agreement between the observed microstructure and the simulation results. The mode of formation of {alpha} phase is also discussed.« less
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  • Spinodal decomposition (SD) is an important phenomenon in materials science and engineering. For example, it is considered to be responsible for the 475 °C embrittlement of stainless steels comprising the bcc (ferrite) or bct (martensite) phases. Structural characterization of the evolving minute nano-scale concentration fluctuations during SD in the Fe–Cr system is, however, a notable challenge, and has mainly been considered accessible via atom probe tomography (APT) and small-angle neutron scattering. The standard tool for nanostructure characterization, viz. transmission electron microscopy (TEM), has only been successfully applied to late stages of SD when embrittlement is already severe. However, we heremore » demonstrate that the structural evolution in the early stages of SD in binary Fe–Cr, and alloys based on the binary, are accessible via analytical scanning TEM. An Fe–36 wt% Cr alloy aged at 500 °C for 1, 10 and 100 h is investigated using an aberration-corrected microscope and it is found that highly coherent and interconnected Cr-rich regions develop. The wavelength of decomposition is rather insensitive to the sample thickness and it is quantified to 2, 3 and 6 nm after ageing for 1, 10 and 100 h, which is in reasonable agreement with prior APT analysis. The concentration amplitude is more sensitive to the sample thickness and acquisition parameters but the TEM analysis is in good agreement with APT analysis for the longest ageing time. These findings open up for combinatorial TEM studies where both local crystallography and chemistry is required. - Highlights: • STEM-EELS analysis was successfully applied to resolve early stage SD in Fe–Cr. • Compositional wavelength measured with STEM-EELS compares well to previous ATP studies. • Compositional amplitude measured with STEM-EELS is a function of experimental parameters. • STEM-EELS allows for combinatorial studies of SD using complementary techniques.« less
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