Design and performance of high-pressure PLANET beamline at pulsed neutron source at J-PARC

Hattori, Takanori; Sano‐Furukawa, Asami; Arima, Hiroshi; Komatsu, Kazuki; Yamada, Akihiro; Inamura, Yasuhiro; Nakatani, Takeshi; Seto, Yusuke; Nagai, Takaya; Utsumi, Wataru; Iitaka, Toshiaki; Kagi, Hiroyuki; Katayama, Yoshinori; Inoue, Toru; Otomo, Toshiya; Suzuya, Kentaro; Kamiyama, Takashi; Arai, M.; Yagi, T.

doi:10.1016/j.nima.2015.01.059

Cited by 103 publications

(74 citation statements)

References 20 publications

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“…While the first fundamental results under high pressure and high temperature have been presented here, there remains a number of questions, such as more detailed studies of the pressurization process and an equation of state incorporating pressure, temperature, composition and atomic order. The latter should lead to neutron scattering experiments, feasible at the PLANET beamline of the J-PARC facility [83], not only to investigate ordered α2, but also ordered βo. Based on the pressure-temperature phase diagram of pure titanium, we predict that the high-temperature, high-pressure-induced β-phase is stabilized over a wide range of TiAl-based alloys, including binary (α2 + γ) titanium aluminides, which opens an extraordinary variety of alloy designs, processing and applications.…”

Section: Discussionmentioning

confidence: 99%

Hydrostatic Compression Behavior and High-Pressure Stabilized β-Phase in γ-Based Titanium Aluminide Intermetallics

Liss

Funakoshi

Dippenaar

et al. 2016

Metals

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Titanium aluminides find application in modern light-weight, high-temperature turbines, such as aircraft engines, but suffer from poor plasticity during manufacturing and processing. Huge forging presses enable materials processing in the 10-GPa range, and hence, it is necessary to investigate the phase diagrams of candidate materials under these extreme conditions. Here, we report on an in situ synchrotron X-ray diffraction study in a large-volume press of a modern (α 2 + γ) two-phase material, Ti-45Al-7.5Nb-0.25C, under pressures up to 9.6 GPa and temperatures up to 1686 K. At room temperature, the volume response to pressure is accommodated by the transformation γ → α 2 , rather than volumetric strain, expressed by the apparently high bulk moduli of both constituent phases. Crystallographic aspects, specifically lattice strain and atomic order, are discussed in detail. It is interesting to note that this transformation takes place despite an increase in atomic volume, which is due to the high ordering energy of γ. Upon heating under high pressure, both the eutectoid and γ-solvus transition temperatures are elevated, and a third, cubic β-phase is stabilized above 1350 K. Earlier research has shown that this β-phase is very ductile during plastic deformation, essential in near-conventional forging processes. Here, we were able to identify an ideal processing window for near-conventional forging, while the presence of the detrimental β-phase is not present under operating conditions. Novel processing routes can be defined from these findings.

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Section: Discussionmentioning

confidence: 99%

Hydrostatic Compression Behavior and High-Pressure Stabilized β-Phase in γ-Based Titanium Aluminide Intermetallics

Liss

Funakoshi

Dippenaar

et al. 2016

Metals

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“…Neutron diffraction measurements were carried out on two sample loadings at the high pressure beamline PLANET [20] at MLF, the Japan Proton Accelerator Research Complex (J-PARC), Tokai, Ibaraki, Japan. Both runs used double-toroidal sintered diamond anvils [21], encapsulating TiZr gaskets, deuterated water (99.6% D) from Eurisotop (France), and highly pure lead from New Metals and Chemicals Ltd.…”

mentioning

confidence: 99%

Bulk moduli and equations of state of ice VII and ice VIII

et al. 2017

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“…PLANET is the beamline dedicated to high-pressure experiments [24]. By using various highpressure devices, powder diffraction data can be obtained over wide pressure and temperature ranges of 0-20 GPa and 4-2000 K, respectively.…”

Section: High-pressure Neutron Diffractometer Planetmentioning

confidence: 99%

“…The neutrons are introduced to the sample under high pressure and those diffracted toward 90 • are detected using the 90 • detector banks consisting of 320 PSDs. The detailed design and specifications are described in [24]. The high-pressure and high-temperature condition is generated using the six-axis multi-anvil press ATSUHIME designed for TOF measurements [86].…”

Section: High-pressure Neutron Diffractometer Planetmentioning

confidence: 99%

Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex II: Neutron Scattering Instruments

Nakajima

Kawakita

Itoh

et al. 2017

QuBS

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Abstract:The neutron instruments suite, installed at the spallation neutron source of the Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC), is reviewed. MLF has 23 neutron beam ports and 21 instruments are in operation for user programs or are under commissioning. A unique and challenging instrumental suite in MLF has been realized via combination of a high-performance neutron source, optimized for neutron scattering, and unique instruments using cutting-edge technologies. All instruments are/will serve in world-leading investigations in a broad range of fields, from fundamental physics to industrial applications. In this review, overviews, characteristic features, and typical applications of the individual instruments are mentioned.

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Design and performance of high-pressure PLANET beamline at pulsed neutron source at J-PARC

Cited by 103 publications

References 20 publications

Hydrostatic Compression Behavior and High-Pressure Stabilized β-Phase in γ-Based Titanium Aluminide Intermetallics

Hydrostatic Compression Behavior and High-Pressure Stabilized β-Phase in γ-Based Titanium Aluminide Intermetallics

Bulk moduli and equations of state of ice VII and ice VIII

Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex II: Neutron Scattering Instruments

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