Microstructural Characterization of Materials for Nuclear Applications Using Small-Angle Neutron Scattering

1997 ◽  
Vol 30 (5) ◽  
pp. 607-612 ◽  
Author(s):  
R. Coppola ◽  
F. Fiori ◽  
M. Magnani ◽  
M. Stefanon
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Microstructural Characterization ◽  
Distribution Functions ◽  
Separate Analysis ◽  
Martensitic Steels ◽  
Resolution Limit ◽  
Characterization Of Materials

The results of a small-angle neutron scattering (SANS) investigation of microstructural evolution in martensitic steels, developed for use in future fusion reactors, are presented. Specifically, modified martensitic steel DIN 1.4914 (MANET type), subjected to different thermal treatments, was studied. The separate analysis of the size distribution functions determined from the nuclear and magnetic SANS components provides information on the presence of different inhomogeneities: large carbides and very small (~1–nm) C–Cr elementary aggregates. In the latter case, since they are such small particles at the resolution limit of the technique, the general problem of extracting their SANS signal from the background has been addressed.

Characterization of anisotropic pores and spatially oriented precipitates in sintered Mo-base alloys using small-angle neutron scattering

2018 ◽  
Vol 51 (6) ◽  
pp. 1706-1714 ◽  
Author(s):  
Lukas Karge ◽  
David Lang ◽  
Jürgen Schatte ◽  
Ralph Gilles ◽  
Sebastian Busch ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Large Scale ◽  
Anisotropic Scattering ◽  
Relative Volume ◽  
Processing Route ◽  
Alloy Matrix ◽  
Characterization Of Materials

Small-angle neutron scattering (SANS) is a powerful method for the characterization of materials in the mesoscopic size range. For example, the method can be used to investigate the precipitation mechanisms in powder metallurgically processed materials. As a result of the processing route, the alloy matrix is usually heavily textured. If precipitates have an orientation relationship to the alloy matrix, they can produce an anisotropic scattering pattern showing streaks. The scattering is superimposed by a background with ellipsoidal shape, originating from deformed large-scale structures. The evaluation of such data quickly becomes elaborate and a quantitative analysis of precipitation is difficult. The present work reports a method for treating the anisotropic scattering from such samples. A systematic study of the ellipsoidal background reveals that it originates from uniaxially deformed sinter pores. Irrespective of the degree of deformation during the processing route, SANS shows that sinter pores remain present in the matrix, and their morphology and relative volume fractions are determined. Consequently, their scattering signal can be subtracted to reveal the scattering from aligned precipitates. The method is demonstrated on powder metallurgically produced pure Mo and an Mo–Hf–C alloy.

Microstructural Characterization of Foam Formed by a Hydroxy Group-Containing Amino Acid Surfactant Using Small-Angle Neutron Scattering

Langmuir ◽  
2020 ◽  
Vol 36 (27) ◽  
pp. 7808-7813
Author(s):  
Shiho Yada ◽  
Hiroshi Shimosegawa ◽  
Hiroya Fujita ◽  
Munehiro Yamada ◽  
Yukako Matsue ◽  
...  
Keyword(s):  
Amino Acid ◽  
Neutron Scattering ◽  
Hydroxy Group ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Microstructural Characterization

Application of Sans to Ceramic Characterization

1986 ◽  
Vol 73 ◽  
Author(s):  
K. G. Frase ◽  
K. A. Hardman-Rhyne ◽  
N. F. Berk
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Ceramic Materials ◽  
Pore Size Distributions ◽  
Mdf Cements ◽  
Characterization Of Materials ◽  
Non Destructive

ABSTRACTTraditionally, small angle neutron scattering (SANS) has been used to study dilute concentrations of defects 1 -100 nm in size. Recent extensions of the scattering theory have allowed the expansion of the technique to include larger sizes through the use of multiple scattering. With multiple small angle neutron scattering, defects (pores, microcracks, precipitates) up to 10 μm in size can be studied. SANS is inherently a non-destructive, bulk probe of microstructure, with wide applications in the characterization of materials.A number of studies of ceramic materials using multiple and traditional (single particle diffraction) small angle neutron scattering will be discussed. The emphasis will be on the strength of the technique in the characterization of materials. Particular examples will include: the assessment of pore size distributions in spinel compacts as a function of sintering and agglomeration, the characterization of primary and secondary particle sizes in precipitated aggregates, and the determination of microporosity in MDF cements.

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