Stroboscopic time-of-flight neutron diffraction during cyclic testing using the event data recording system at J-PARC

2018 ◽  
Vol 51 (3) ◽  
pp. 630-634 ◽  
Author(s):  
Takuro Kawasaki ◽  
Yasuhiro Inamura ◽  
Takayoshi Ito ◽  
Takeshi Nakatani ◽  
Stefanus Harjo ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Electric Field ◽  
Domain Switching ◽  
Time Of Flight ◽  
Event Data ◽  
Diffraction Intensity ◽  
Time Resolved ◽  
Properties Of Materials ◽  
Neutron Diffraction Technique ◽  
Time Information

A time-resolved time-of-flight neutron diffraction technique to characterize the structural properties of materials during cyclic tests has been developed for the neutron diffractometers at J-PARC. Using this technique, diffracted neutrons and the applied cyclic conditions are recorded as event data together with time information. The amplitude and phase of the conditions of all recorded neutron signals can be specified by using the characteristics of the event data. By adopting the developed technique, the behaviors of the crystal lattice and domains of the piezoelectric material in a multilayer-type piezoelectric actuator driven by a cyclic electric field were evaluated. The developed technique enabled the collection and processing of diffraction data for all levels of the applied electric field, as opposed to only the highest and lowest levels. The variation in diffraction intensity during the application of a cyclic electric field was obtained successfully, and the hysteresis-like behaviors of both the lattice strain and the 90° domain switching were revealed.

Utilization of an Event-Recording System for Neutron Diffraction Experiments

2014 ◽  
Vol 783-786 ◽  
pp. 2071-2074 ◽  
Author(s):  
Takayoshi Ito ◽  
Stefanus Harjo ◽  
Yasuhiro Inamura ◽  
Takeshi Nakatani ◽  
Takuro Kawasaki ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Life Science ◽  
Fatigue Tests ◽  
Recording System ◽  
Neutron Generation ◽  
Experimental Facility ◽  
Event Data ◽  
Time Resolved ◽  
Event Recording

We present effectivity of an event-recording system in neutron diffraction experiments at the Engineering Materials Diffractometer TAKUMI at the Materials and Life Science Experimental Facility in J-PARC. We developed an event-recording system for recording information of neutron generation and detection and sample environmental conditions like load, strain, etc. as events with synchronized timing tag across whole system, and developed a software to handle the event data. It gave us several advantages by allowing us flexible data reduction depending on users’ purposes, especially for time resolved experiments. We demonstratedin situneutron diffraction measurements using these new recording system and software to show the advantages. These new system and software are very attractive to be applied for measurements that need stroboscopic data collection such as fatigue tests.

Time-resolved X-ray reciprocal space mapping of the crystal under external electric field

2018 ◽  
Vol 189 (02) ◽  
pp. 187-194 ◽  
Author(s):  
Nikita V. Marchenkov ◽  
Anton G. Kulikov ◽  
Ivan I. Atknin ◽  
Arsen A. Petrenko ◽  
Alexander E. Blagov ◽  
...  
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Space Mapping ◽  
Reciprocal Space ◽  
Reciprocal Space Mapping ◽  
Time Resolved ◽  
X Ray

scholarly journals Through-Thickness Microstructure Characterization in a Centrifugally Cast Austenitic Stainless Steel Nuclear Reactor Primary Loop Pipe Using Time-of-Flight Neutron Diffraction

2021 ◽  
Vol 5 (2) ◽  
pp. 12
Author(s):  
Matthew M. Schmitt ◽  
Daniel J. Savage ◽  
James J. Wall ◽  
John D. Yeager ◽  
Chanho Lee ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Neutron Diffraction ◽  
Time Of Flight ◽  
Radial Distance ◽  
Ultrasonic Waves ◽  
Science Center ◽  
Los Alamos ◽  
Inspection Method ◽  
Centrifugally Cast

The US code of Federal Regulations mandates regular inspection of centrifugally cast austenitic stainless steel pipe, commonly used in primary cooling loops in light-water nuclear power plants. These pipes typically have a wall thickness of ~8 cm. Unfortunately, inspection using conventional ultrasonic techniques is not reliable as the microstructure strongly attenuates ultrasonic waves. Work is ongoing to simulate the behavior of acoustic waves in this microstructure and ultimately develop an acoustic inspection method for reactor inspections. In order to account for elastic anisotropy in the material, the texture in the steel was measured as a function of radial distance though the pipe wall. Experiments were conducted on two 10 × 12.7 × 80 mm radial sections of a cast pipe using neutron diffraction scans of 2 mm slices using the HIPPO time-of-flight neutron diffractometer at the Los Alamos Neutron Science Center (LANSCE, Los Alamos, NM, USA). Strong textures dominated by a small number of austenite grains with their (100) direction aligned in the radial direction of the pipe were observed. ODF analysis indicated that up to 70% of the probed volume was occupied by just three single-grain orientations, consistent with grain sizes of almost 1 cm. Texture and phase fraction of both ferrite and austenite phases were measured along the length of the samples. These results will inform the development of a more robust diagnostic tool for regular inspection of this material.

Electric-Field-Induced Domain Switching and Domain Texture Relaxations in Bulk Bismuth Ferrite

2015 ◽  
Vol 98 (12) ◽  
pp. 3884-3890 ◽  
Author(s):  
Neamul H. Khansur ◽  
Tadej Rojac ◽  
Dragan Damjanovic ◽  
Christina Reinhard ◽  
Kyle G. Webber ◽  
...  
Keyword(s):  
Electric Field ◽  
Domain Switching ◽  
Bismuth Ferrite
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