Rapid Measurement of Texture of Metals by Time-of-Flight Neutron Diffraction at iMATERIA and its Applications

2016 ◽  
Vol 879 ◽  
pp. 1426-1430 ◽  
Author(s):  
Yusuke Onuki ◽  
Akinori Hoshikawa ◽  
Shigeo Sato ◽  
Toru Ishigaki
Keyword(s):  
Neutron Diffraction ◽  
Measurement System ◽  
Life Science ◽  
Time Of Flight ◽  
Incident Beam ◽  
High Flux ◽  
Experimental Facility ◽  
Texture Measurement ◽  
Rapid Measurement ◽  
Time Of Flight Method

The authors have developed the texture measurement system at iMATERIA, which is the neutron diffractometers built in Materials and Life Science Experimental Facility (MLF) at J-PARC, Japan. The high flux of the incident beam and Time-Of-Flight method enabled the complete texture measurement within several minutes in case of steels. Since the neutron beam can transmit most of the materials, the measured texture represents the state of whole exposed volume. The multi-histogram analysis also enables to determine phase fractions in a multiphase material as well as the texture of each phase.

Strain and Particle Size of Palladium Metal Powders by Time-of-Flight Neutron Diffraction

1989 ◽  
Vol 33 ◽  
pp. 403-407
Author(s):  
A. C. Lawson ◽  
J. W. Conant ◽  
C. L. Talcott ◽  
M. A. David ◽  
J. Vaninetti ◽  
...  
Keyword(s):  
Particle Size ◽  
Neutron Diffraction ◽  
Powder Diffraction ◽  
Time Of Flight ◽  
Metal Powders ◽  
Line Broadening ◽  
X Ray ◽  
Palladium Powder ◽  
Time Of Flight Method ◽  
Palladium Metal

AbstractWe have determined the strain and particle size for several samples of palladium powder by time-of-flight nrutron powder diffraction on two different diffractometers and by x-ray powder diffraction. The results are compared and found to be in fair agreement. The time-of-flight method gives good enough precision to reveal deficiencies in the simple models used for strain and particle size line broadening.

scholarly journals Phase imaging using time-of-flight neutron diffraction

2006 ◽  
Vol 39 (1) ◽  
pp. 82-89 ◽  
Author(s):  
M. J. Gutmann ◽  
W. Kockelmann ◽  
L. C. Chapon ◽  
P. G. Radaelli
Keyword(s):  
Neutron Diffraction ◽  
Phase Distribution ◽  
Tomographic Reconstruction ◽  
Time Of Flight ◽  
Incident Beam ◽  
Phase Imaging ◽  
Data Set ◽  
Sample Position ◽  
Scattering Material ◽  
Experimental Geometry

A technique that allows the spatial distribution of crystallographic phases in the interior of an object to be reconstructed from neutron time-of-flight (TOF) diffraction is described. To this end, the shift of the Bragg peaks due to the so-called `geometrical aberration' is exploited. A collimated incident white beam is used to perform a translational or rotational scan of the object whilst collecting a TOF data set for each sample position or orientation. Depending on the location of any scattering material along the line of the incident beam path through the object, the measuredd-spacings of the corresponding Bragg peaks are shifted with respect to their nominal values, which are attained only at the geometrical centre of the instrument. Using a formula that is usually employed to correct for sample offset, the phase distribution along the incident beamline can be directly reconstructed, without the need to perform a tomographic reconstruction. Results are shown from a demonstration experiment carried out on a cylindrical Al container enclosing an arrangement of Cu and Fe rods. On the basis of this formalism, an optimized experimental geometry is described and the potential and limits of this technique are explored, as are its applicability to X-ray and constant-wavelength neutron diffraction.

scholarly journals Neutron capture and total cross-section measurements of 155Gd and 157Gd at ANNRI in J-PARC

2020 ◽  
Vol 239 ◽  
pp. 01012
Author(s):  
Atsushi Kimura ◽  
Shoji Nakamura ◽  
Osamu Iwamoto ◽  
Nobuyuki Iwamoto ◽  
Hideo Harada ◽  
...  
Keyword(s):  
Cross Sections ◽  
Neutron Capture ◽  
Life Science ◽  
Measurement Instrument ◽  
Proton Accelerator ◽  
Experimental Facility ◽  
Total Cross Sections ◽  
Neutron Time ◽  
Time Of Flight Method ◽  
Glass Detectors

Neutron capture and total cross sections of 155Gd and 157Gd were measured with the neutron time-of-flight method in Accurate Neutron-Nucleus Reaction measurement Instrument at Material and Life Science Experimental Facility of the Japan Proton Accelerator Research Complex using the NaI (Tl) spectrometer and Li-glass detectors. Preliminary cross sections were obtained in the neutron energy region from 4 meV to 100 meV. The derived cross sections agree with evaluated values in JENDL 4.0 and the experimental results by Mastromarco but were not consistent with those by Leinweber.

Measurement System of Time-of-Flight Method

2013 ◽  
Vol 28 (5) ◽  
pp. 810-814
Author(s):  
康兰兰 KANG Lan-lan ◽  
郭兴 GUO Xing ◽  
王蓉 WANG Rong ◽  
康智慧 KANG Zhi-hui ◽  
高锦岳 GAO Jin-yue
Keyword(s):  
Measurement System ◽  
Time Of Flight ◽  
Time Of Flight Method

Influence of Beam Divergence on Pseudo-Strain Induced in Time-of-Flight Neutron Diffraction

2014 ◽  
Vol 777 ◽  
pp. 105-111 ◽  
Author(s):  
Hiroshi Suzuki ◽  
Stefanus Harjo ◽  
Jun Abe ◽  
Koichi Akita
Keyword(s):  
Neutron Diffraction ◽  
Steel Plate ◽  
Surface Effect ◽  
Time Of Flight ◽  
Incident Beam ◽  
Surface Strain ◽  
Beam Divergence ◽  
Coarse Grain ◽  
Attenuation Effect ◽  
Neutron Attenuation

Effects of beam divergence on pseudo-strains observed in time-of-flight (TOF) neutron diffraction, which overlapped with the neutron attenuation effect and the surface-effect, were investigated. The through-surface strain scanning on an annealed steel plate was performed in different instrument resolutions by controlling the incident beam divergence. Typical pseudo-strain distributions were observed, but they showed different trend according to the beam divergence. Furthermore, it was demonstrated that the pseudo-strains induced in strain scanning measurements of coarse grain materials can be suppressed by controlling the incident beam divergence. Therefore, the incident beam divergence must be carefully considered to reduce pseudo-strains in time-of-flight neutron diffractometry.

scholarly journals Rapid measurement scheme for texture in cubic metallic materials using time-of-flight neutron diffraction at iMATERIA

2016 ◽  
Vol 49 (5) ◽  
pp. 1579-1584 ◽  
Author(s):  
Yusuke Onuki ◽  
Akinori Hoshikawa ◽  
Shigeo Sato ◽  
Pingguang Xu ◽  
Toru Ishigaki ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Time Of Flight ◽  
Texture Measurement ◽  
Sample Rotation ◽  
Rapid Measurement ◽  
Measurement Scheme ◽  
Neutron Diffractometer ◽  
Wide Range ◽  
Minimum Number

A rapid texture measurement system has been developed on the time-of-flight neutron diffractometer iMATERIA (beamline BL20, MLF/J-PARC, Japan). Quantitative Rietveld texture analysis with a neutron beam exposure of several minutes without sample rotation was investigated using a duplex stainless steel, and the minimum number of diffraction spectra required for the analysis was determined experimentally. The rapid measurement scheme employs 132 spectra, and by this scheme the quantitative determination of volume fractions of texture components in ferrite and austenite cubic phases in a duplex stainless steel can be made in a short time. This quantitative and rapid measurement scheme is based on the salient features of iMATERIA as a powder diffractometer, i.e. a fairly high resolution in d spacing and numerous detectors covering a wide range of scattering angle.

Sign in / Sign up

Export Citation Format

Share Document