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Journal Articles

Deformation mechanism of a strong and ductile maraging steel investigated using ${it in situ}$ X-ray synchrotron diffraction

Li, H.*; Liu, Y.*; Zhao, W.*; Liu, B.*; Tominaga, Aki; Shobu, Takahisa; Wei, D.*

International Journal of Plasticity, 165, p.103612_1 - 103612_20, 2023/06

 Times Cited Count:0 Percentile:67.19(Engineering, Mechanical)

In order to clarify the strength properties of Co-free maraging steel, ${it in situ}$ tensile experiment using high energy synchrotron X-ray diffraction was performed. Diffraction profiles from the martensitic and austenitic phases were obtained, and their strength and width were observed to vary as loading. Analysis of the diffraction profiles showed that the content of martensite in the as-aged material decreased slowly at low stress levels and decreased rapidly at high stress levels. On the other hand, the austenite phase in the as-solution materials was significantly transformed the martensite phase as the stress increased. It was clarified to be responsible for their respective strength properties.

Journal Articles

In situ X-ray diffraction study of the oxide formed on alloy 600 in borated and lithiated high-temperature water

Watanabe, Masashi*; Yonezawa, Toshio*; Shobu, Takahisa; Shiro, Ayumi; Shoji, Tetsuo*

Corrosion, 72(9), p.1155 - 1169, 2016/09

 Times Cited Count:1 Percentile:6.4(Materials Science, Multidisciplinary)

Journal Articles

Li$$_{4}$$FeH$$_{6}$$; Iron-containing complex hydride with high gravimetric hydrogen density

Saito, Hiroyuki; Takagi, Shigeyuki*; Matsuo, Motoaki*; Iijima, Yuki*; Endo, Naruki*; Aoki, Katsutoshi*; Orimo, Shinichi*

APL Materials (Internet), 2(7), p.076103_1 - 076103_7, 2014/07

 Times Cited Count:23 Percentile:70.83(Nanoscience & Nanotechnology)

Journal Articles

X-ray diffraction study on GaAs(001)-2$$times$$4 surfaces under molecular-beam epitaxy conditions

Takahashi, Masamitsu; Yoneda, Yasuhiro; Mizuki, Junichiro

Applied Surface Science, 237(1-4), p.219 - 223, 2004/10

 Times Cited Count:5 Percentile:29.88(Chemistry, Physical)

The GaAs(001)-$$(2times4)$$ reconstructed surface was investigated by in situ surface X-ray diffraction. The sample was subjected to measurements under molecular-beam epitaxy conditions without being transferred another chamber. Several X-ray diffraction patterns were measured with increasing the substrate temperature within the $$beta$$-phase of GaAs(001)-$$(2times4)$$ in a constant As flux of 5$$times$$10$$^{-7}$$ Torr. At relatively low temperatures up to 545$$^circ$$C, the observed X-ray diffraction patterns agree well to the $$beta$$2(2$$times$$4) surface. However, a different X-ray diffraction pattern was obtained at 585$$^circ$$C, while the $$2times 4$$ periodicity still persited. This change is explained by partial As-dimer desorption which results in a mixture of the $$beta$$2(2$$times$$4) and $$alpha$$2(2$$times$$4) structures.

Journal Articles

Synthesis of Al$$_{x}$$Ga$$_{1-x}$$N alloy by solid-phase reaction under high pressure

Saito, Hiroyuki; Utsumi, Wataru; Kaneko, Hiroshi*; Aoki, Katsutoshi

Japanese Journal of Applied Physics, Part 2, 43(7B), p.L981 - L983, 2004/07

 Times Cited Count:5 Percentile:24.06(Physics, Applied)

Bulk specimens of Al$$_{x}$$Ga$$_{1-x}$$N alloys covering a composition range of 0$$leq$$${it x}$$$leq$$1 were synthesized by a solid-phase reaction under high pressure. ${it In situ}$ X-ray diffraction profiles were measured to observe the alloying process, which began at around 800$$^{circ}$$C under 6.0 GPa. SEM observation and X-ray analysis of the recovered specimen indicated a uniform distribution of Al and Ga and continuous variations of the lattice constants against the composition, which implies that a solid solution of AlN and GaN is formed regardless of atomic composition.

Journal Articles

X-ray diffractometer for studies on molecular-beam-epitaxy growth of III-V semiconductors

Takahashi, Masamitsu; Yoneda, Yasuhiro; Inoue, Hirotane*; Yamamoto, Naomasa*; Mizuki, Junichiro

Japanese Journal of Applied Physics, Part 1, 41(10), p.6247 - 6251, 2002/10

 Times Cited Count:55 Percentile:85.29(Physics, Applied)

An X-ray diffractometer connected with a molecular-beam epitaxy (MBE) system has been constructed for in situ studies on the growing surfaces of III-V compound semiconductors. This diffractometer is based on the (4+2) type and equipped with an axis for rotating the receiving slit about the normal of the slit plane. This additional axis is used to align the resolution of the receiving slit properly for the surface X-ray diffraction measurement. For the alignment of the sample and the whole setup with respect to the X-ray beam, an XYZ-stage and an adjustable base plate are available. X-rays enter and leave the chamber through two cylindrical Be windows welded onto the MBE chamber. A graphite sheet which can be heated up to 250$$^circ$$C is placed along the inside of the Be windows to protect the Be windows from being coated with evaporated materials. Preliminary data are presented to demonstrate the feasibility of static and dynamic measurements of growing surfaces using this instrument.

Journal Articles

In situ X-ray observations of the decomposition of brucite and the graphite-diamond conversion in aqueous fluid at high pressure and temperature

Okada, Taku; Utsumi, Wataru; Kaneko, Hiroshi*; Yamakata, Masaaki*; Shimomura, Osamu

Physics and Chemistry of Minerals, 29(7), p.439 - 445, 2002/08

 Times Cited Count:16 Percentile:53.71(Materials Science, Multidisciplinary)

An experimental technique to make real-time observations at high pressure and temperature of the diamond forming process in candidate material of mantle fluids as a catalyst has been established for the first time. In situ X-ray diffraction experiments using synchrotron radiation have been performed upon a mixture of brucite (Mg(OH)$$_{2}$$) and graphite as starting material. Brucite decomposes into periclase (MgO) and H$$_{2}$$O at 3.6 GPa and 1050$$^{circ}$$C while no periclase is formed after the decomposition of brucite at 6.2 GPa and 1150$$^{circ}$$C, indicating that the solubility of the MgO component in H$$_{2}$$O greatly increases with increasing pressure. The conversion of graphite to diamond in aqueous fluid has been observed at 7.7 GPa and 1835$$^{circ}$$C. Time-dependent X-ray diffraction profiles for this transformation have been successfully obtained.

Journal Articles

New Polymorph of SiO$$_{2}$$ formed under Quasi-hydrostatic compression of cristobalite

Yamakata, Masaaki*; Yagi, Takehiko*

Review of High Pressure Science and Technology, 7, p.107 - 109, 1998/00

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