scholarly journals Early stages of spinodal decomposition in Fe–Cr resolved by in-situ small-angle neutron scattering

2015 ◽  
Vol 106 (6) ◽  
pp. 061911 ◽  
Author(s):  
M. Hörnqvist ◽  
M. Thuvander ◽  
A. Steuwer ◽  
S. King ◽  
J. Odqvist ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Spinodal Decomposition ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Early Stages

Fractal morphologies from decomposition of Fe−Ni−Invar alloys

1997 ◽  
Vol 12 (1) ◽  
pp. 83-92 ◽  
Author(s):  
Q. Li ◽  
A. Wiedenmann ◽  
H. Wollenberger
Keyword(s):  
Neutron Scattering ◽  
Spinodal Decomposition ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Miscibility Gap ◽  
Early Stages ◽  
Invar Alloys ◽  
Precipitated Phase

Small angle neutron scattering investigations performed on Fe1−x–Nix alloys with 0.26 ≤ x ≤ 0.45 revealed a thermodynamically driven decomposition below 800 °C. The miscibility gap extends at least from 30 at.% Ni to 45 at.% Ni. The diffusioncontrolled decomposition produces fractal morphologies during the early stages of the process. During annealing the structure of the precipitated phase densifies continuously from mass fractals with small dimensionality (1 ≤ dm ≤ 3) to surface fractals with 2 ≤ ds ≤ 3. The results are compared with recent simulations of aggregation and growth as well as with a new analysis of spinodal decomposition, both predicting fractal morphologies.

Early Stages of Decomposition in Ni-Rich Ni-Ti

1999 ◽  
Vol 580 ◽  
Author(s):  
M. Kompatscher ◽  
B. Demé ◽  
J. Hecht ◽  
H. Heinrich ◽  
J. Kohlbrecher ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Single Crystals ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Miscibility Gap ◽  
Early Stages

AbstractIn-situ small-angle neutron scattering was performed on Ni-(10 to 12) at.% Ti polycrystals and single crystals at temperatures between 870 and 1270 K. During decomposition metastable precipitates of cuboidal shape form with preferred alignement along <100>. The Ti concentration of these precipitates is 17(1) at.% (between 870 and 950 K). Metastable precipitates precede the formation of platelets of the stable η phase even outside the hitherto accepted metastable miscibility gap.

An in situ small angle neutron scattering study of expanded graphite under a uniaxial stress

Carbon ◽  
2013 ◽  
Vol 57 ◽  
pp. 460-469 ◽  
Author(s):  
Félix Balima ◽  
Vittoria Pischedda ◽  
Sylvie Le Floch ◽  
Annie Brûlet ◽  
Peter Lindner ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Expanded Graphite ◽  
Uniaxial Stress ◽  
Scattering Study ◽  
Neutron Scattering Study

scholarly journals In Situ Monitoring of Latex Film Formation by Small-Angle Neutron Scattering: Evolving Distributions of Hydrophilic Stabilizers in Drying Colloidal Films

Langmuir ◽  
2019 ◽  
Vol 35 (10) ◽  
pp. 3822-3831 ◽  
Author(s):  
Ignacio Martín-Fabiani ◽  
David K. Makepeace ◽  
Philip G. Richardson ◽  
Jennifer Lesage de la Haye ◽  
Diego Alba Venero ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Film Formation ◽  
In Situ Monitoring ◽  
Latex Film ◽  
Colloidal Films ◽  
Latex Film Formation

Experimental Evidence of Super Densification of Adsorbed Hydrogen by in-situ Small Angle Neutron Scattering (SANS)

2011 ◽  
Vol 1334 ◽  
Author(s):  
Dipendu Saha ◽  
Lilin He ◽  
Cristian I. Contescu ◽  
Nidia C. Gallego ◽  
Yuri B. Melnichenko
Keyword(s):  
Neutron Scattering ◽  
Pore Size ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Hydrogen Gas ◽  
Necessary Condition ◽  
Adsorbed Hydrogen ◽  
Oak Ridge ◽  
Hydrogen Molecules

ABSTRACTEntrapping hydrogen molecules within the nanopores of solid adsorbents serves as a unique alternative for on-board storing of hydrogen for transportation purposes. The key advantage of the physisorption process for hydrogen storage is the higher density values achieved with the adsorbed gas, compared to that of the compressed phase, translating into higher storage capacities at lower pressures. The necessary condition for effective adsorption is the presence of narrow micropores of < 2 nm in width which provide the most suitable environment of hydrogen adsorption. Despite numerous theoretical calculations or indirect experimental estimations, there has not been a direct experimental measurement of the density of adsorbed hydrogen as a function of pressure and/or pore size. In the present study, we report on the use of in-situ small angle neutron scattering (SANS) to study the phase behavior of hydrogen confined in narrow micropores. We provide for the first time direct experimental measurements of the effect of pore size and pressure on hydrogen adsorbed on a polyfurfuryl alcohol-derived activated carbon (PFAC), at room temperature and pressures up to 207 bar. SANS studies were carried out at the General-Purpose Small-Angle Neutron Scattering spectrometer of the High Flux Isotope Reactor at Oak Ridge National Laboratory. The measurements covered the Q-range from 0.01 to 0.8 Å-1, covering the pores in the range of 9 to 34 Å of the PFAC material. Initial results suggest that the density of adsorbed hydrogen is higher than the density of bulk hydrogen gas and increases with decreasing pore size.

Spinodal decomposition in Fe-Cr alloys studied by small angle neutron scattering

Physica B+C ◽  
1983 ◽  
Vol 120 (1-3) ◽  
pp. 383-386 ◽  
Author(s):  
M. Furusaka ◽  
Y. Ishikawa ◽  
S. Yamaguchi ◽  
Y. Fujino
Keyword(s):  
Neutron Scattering ◽  
Spinodal Decomposition ◽  
Small Angle ◽  
Small Angle Neutron Scattering
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