Characterisation of precipitates in a stainless maraging steel by three-dimensional atom probe and small-angle neutron scattering

2004 ◽  
Vol 95 (7) ◽  
pp. 644-649 ◽  
Author(s):  
H. Leitner ◽  
H. Clemens ◽  
S. Höring ◽  
N. Wanderka ◽  
J. Banhart ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Maraging Steel ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Three Dimensional ◽  
Atom Probe ◽  
Stainless Maraging Steel

Boron carbide composite apertures for small-angle neutron scattering made by three-dimensional printing

2016 ◽  
Vol 49 (2) ◽  
pp. 696-699 ◽  
Author(s):  
Anders Olsson ◽  
Adrian R. Rennie
Keyword(s):  
Boron Carbide ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Three Dimensional ◽  
Fused Filament Fabrication ◽  
Γ Radiation ◽  
Three Dimensional Printing ◽  
Complex Shapes ◽  
Dimensional Printing

Apertures for small-angle neutron scattering prepared from a boron carbide/polymer composite have been made by three-dimensional printing using fused filament fabrication. Use of enriched 10B4C gives higher absorption and much lower parasitic scattering than natural B4C. The simple fabrication, the capability to replace toxic and environmentally hazardous materials such as cadmium, and the possibility to diminish the secondary background of γ-radiation are attractive features of use of these materials. Complex shapes, apart from apertures, can be fabricated readily with this composite, for example, to make shielding for instrument components and masks used to calibrate detectors.

SANS Study of Carbon Addition in Ti–45Al–5Nb

2011 ◽  
Vol 1295 ◽  
Author(s):  
P. Staron ◽  
F.-P. Schimansky ◽  
C. Scheu ◽  
H. Clemens
Keyword(s):  
Neutron Scattering ◽  
Size Distribution ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Tial Alloy ◽  
Small Volume ◽  
Volume Fraction ◽  
Atom Probe ◽  
Carbon Addition ◽  
Small Volume Fraction

ABSTRACTThe distribution of carbon in Ti–45Al–5Nb–0.5C was studied using small-angle neutron scattering (SANS). In an earlier study, carbon had been found to form small perovskite precipitates in a γ-TiAl alloy without Nb, which significantly increase the strength of the material. In the Nb-containing alloy, however, no strengthening precipitates were observed, but most of the C was found to be homogeneously distributed. Atom probe investigations revealed only few C-enriched regions. The present SANS investigation was carried out to confirm the presence and size distribution of these C-enriched regions in the material. The SANS results show that a small volume fraction of such C-enriched regions is present, while the large number of small precipitates found in the alloy without Nb is indeed missing in the Nb-containing alloy.

scholarly journals Precipitation in a novel maraging steel F1E: A study of austenitization and aging using small angle neutron scattering

2017 ◽  
Vol 129 ◽  
pp. 270-281 ◽  
Author(s):  
V. Gray ◽  
D. Galvin ◽  
L. Sun ◽  
E.P. Gilbert ◽  
T. Martin ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Maraging Steel ◽  
Small Angle ◽  
Small Angle Neutron Scattering

Three-dimensional small-angle neutron scattering of shear-induced phase separation in a dynamically asymmetric polymer mixture

2006 ◽  
Vol 39 (6) ◽  
pp. 878-888 ◽  
Author(s):  
Satoshi Koizumi ◽  
Jun-ichi Suzuki
Keyword(s):  
Phase Separation ◽  
Neutron Scattering ◽  
Temperature Region ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Three Dimensional ◽  
Shear Velocity ◽  
Intermediate Temperature ◽  
Polymer Mixture ◽  
Vinyl Methyl Ether

A polymer mixture of polystyrene (PS)/poly(vinyl methyl ether) (PVME) has been investigated by using a three-dimensional small-angle neutron scattering (3D-SANS) method. PS and PVME exhibit a large difference in the glass transition temperatureTg. Therefore, dynamical asymmetry is strongly enhanced in an intermediate temperature region between theTgvalues of neat PS and PVME. In the intermediate temperature region, a shear deformation was imposed on the polymer mixture to enhance the concentration fluctuations,i.e.shear-induced phase separation. By rotating the film specimen, which was rapidly quenched after deformation, 3D-SANS due to shear-induced phase separation was observed successfully. In theqx=qyplane of the sample coordinate system, whereqis a component of scattering vectorq, it was possible to observe SANS of `double-lobe' shape, with the minor axes of the lobes inclined towardsqx=qy, whereqx,qyandqz, denote the shear, velocity gradient and vorticity directions in reciprocal space, respectively. Abnormal `butterfly' scattering was observed in a section cut through the 3D-SANS in theqxqzplane. The 3D-SANS thus obtained is discussed in comparison with a model of dynamical coupling between stress and diffusion.

Three-dimensional magnetic spin-echo small-angle neutron scattering and neutron depolarization: A comparison

2006 ◽  
Vol 77 (7) ◽  
pp. 073902 ◽  
Author(s):  
M. Theo Rekveldt ◽  
Niels H. van Dijk ◽  
Serguei V. Grigoriev ◽  
Wicher H. Kraan ◽  
Wim G. Bouwman
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Spin Echo ◽  
Three Dimensional ◽  
Magnetic Spin ◽  
Neutron Depolarization

Revisiting Temporal Evolution of Cu-Rich Precipitates in Fe–Cu Alloy: Correlative Small Angle Neutron Scattering and Atom-Probe Tomography Studies

2019 ◽  
Vol 25 (4) ◽  
pp. 840-848 ◽  
Author(s):  
Sarita Ahlawat ◽  
Sudip Kumar Sarkar ◽  
Debasis Sen ◽  
Aniruddha Biswas
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Atom Probe Tomography ◽  
Small Angle Neutron Scattering ◽  
Nuclear Reactor ◽  
Temporal Evolution ◽  
Morphological Evolution ◽  
Atom Probe ◽  
Pressure Vessels ◽  
Morphological Transformation

AbstractBinary Fe–Cu alloys are effective prototypes for investigating radiation-induced formation and growth of nanometric Cu-rich precipitates (CRPs) in nuclear reactor pressure vessels. In this report, the temporal evolution of CRPs during thermal aging of Fe–Cu binary alloys has been investigated by using complementary techniques such as atom probe tomography (APT) and small-angle neutron scattering (SANS). We report a detailed quantitative evolution of a rarely observed morphological transformation of Cu precipitates from spherical to ellipsoid with a significant change (approximately two times) in aspect ratio, an effect known to be associated with the 9R-3R structural transition of the precipitates. It is demonstrated through APT that the precipitates remain spherical up to 8 h, however, they subsequently convert to oblate ellipsoid upon further aging. SANS analysis also detected signs of this morphological transition in reciprocal space. Furthermore, SANS quantifies evolution of the precipitates and corroborates well with the APT results. Interestingly, the power-law exponent of the temporal evolution for mean size and number density agree reasonably well with the Lifshitz–Slyozov–Wagner model, in spite of the complex morphological evolution of the precipitates.

scholarly journals Three-dimensional Model of Human Platelet Integrin αIIbβ3 in Solution Obtained by Small Angle Neutron Scattering

2009 ◽  
Vol 285 (2) ◽  
pp. 1023-1031 ◽  
Author(s):  
Aurora Nogales ◽  
Carolina García ◽  
Javier Pérez ◽  
Phil Callow ◽  
Tiberio A. Ezquerra ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Human Platelet ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Integrin Αiibβ3

Combined use of small-angle neutron scattering and atom probe tomography for the analysis of precipitates in a Fe-15 m% Co-25 m% Mo alloy

2009 ◽  
Vol 97 (2) ◽  
pp. 331-340 ◽  
Author(s):  
Elisabeth Eidenberger ◽  
Erich Stergar ◽  
Harald Leitner ◽  
Peter Staron ◽  
Jürgen Spitaler ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Atom Probe Tomography ◽  
Small Angle Neutron Scattering ◽  
Atom Probe ◽  
Combined Use
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