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BL19 TAKUMI Engineering Materials Diffractometer


Solving various problems related to internal stresses and microstructures

Research ObjectivesMetals, ceramics, composites, small to large sizes of components.
FeaturesSimultaneous strain measurement of more than two orthogonal strain components, multi-peak (more than 15 peaks for FCC steel) measurement, highest strain accuracy by highest peak resolution.

TAKUMI is a TOF neutron powder diffractometer dedicated for engineering sciences. Careful analysis of the Bragg peaks in a neutron diffraction pattern can reveal important structural details of a sample material such as internal stresses, phase conditions, dislocations, texture etc. Such information is often crucial in engineering applications and the ability to carry out either ex-situ or in-situ measurements makes neutron diffraction particularly useful in this respect.


Last Update: 2016-10-12

InstrumentEngineering Materials Diffractometer (TAKUMI)
Overview of instrumentInternal strain mapping in engineering components;
Microstructural evolutions during deformations and/or thermal processes of structural or functional materials;
Microstructural evolutions during manufacturing (thermo-mechanical) processes of structural or functional materials;
Crystallographic investigations of small regions in engineering materials;
Texture analyses of engineering materials;
ModeratorPoisoned decoupled hydrogen moderator
d-rangeStandard (single frame): Δd ~ 0.25 nm (dmin and dmax are tunable)
Wide (double frame): Δd ~ 0.50 nm (dmax is about 0.50 nm)
S/N ratio~10-3
Peak resolutionLow resolution (~ 0.4 %)
Medium resolution (~ 0.3 %, most cases)
High resolution (~ 0.2 %)
Radial collimators 1 mm, 2mm, 5 mm (a pair of each)
Typical sample sizeLoading: D ≤ 6mm rod or T 2mm × W 6mm plate
Strain mapping: less than 250 × 250 × 2000 mm3
Powder samples for reference, etc
Data acquisition• Event recording (data reduction with the functions of time-slicing, TOF-binning width, and detector range can be done during or after the experiment.)
• Online data monitoring (per several seconds)
• Data reduction based on the physical conditions (load, strain, temperature, etc.) is under development
Ancillary equipment and sample environment• Large sample table (table size: 700 mm × 700 mm, load capacity: 1 ton)
• BL19 Standard loading machine (50 kN)
• Furnace system for high temp loading (1273 K)
• 100 K cooling system for loading experiment (80 K – 473 K)
• Cryogenic loading machine (6 K – 220 K, 50 kN)
• Fatigue machine (60 kN, < 30 Hz)
• High temperature loading machine for small specimen (25 kN, 1273 K)
• Dilatometer (1273 K)
• Eularian Cradle
• Gandolfi goniometer
Other information for user's convenience

Typical measurement time in one condition (load, temperature…) for internal strain analysis during in-situ measurement of various materials at 300 kW:

MaterialSizeGauge (mm3)ResolutionMeasurement time
Steelφ 5 mmw5 x d5 x h50.3 %> 30 sec.
Magnesiumφ 6 mmw5 x d5 x h50.3 %> 1 min.
Titaniumφ 5 mmw5 x d5 x h50.3 %> 3 min.

Ex1) In-situ measurement in 15 loading conditions for a φ 5 mm steel rod in the conditions of 5 x 5 x 5 mm3 gauge volume and 0.3 % resolution.
Total time = 30 sec. x 15 loads
= 7.5 min.

Measurement time needed for dislocation characterization is more than 20 times longer.

Typical measurement time at one sampling position for strain mapping of a steel sample with various neutron path lengths at 300 kW:

MaterialPath lengthGauge (mm3)ResolutionMeasurement time
Steel5 mmw2 x d2 x h20.2 %> 5 min.
Steel10 mmw2 x d2 x h20.2 %> 10 min.
Steel15 mmw2 x d2 x h20.2 %> 20 min.

Ex2) Strain mapping in 20 positions for a steel sample in the conditions of
10 mm path length, 2 x 2 x 2 mm3 gauge volume and 0.2 % resolution.
Total time = 10 min. x 20 points
= 200 min.

*Time to move a sample or to change a load, and time for the mounting and alignment are not included in the examples.

Beamline Team

ContactKazuya AIZAWA (J-PARC Center, JAEA)
Secondary contactStefanus HARJO (J-PARC Center, JAEA)
Tsuyoshi HARADA (J-PARC Center, JAEA)
Wu GONG (Kyoto University, Elements Strategy Initiative for Structural Materials/J-PARC Center, JAEA)

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