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Journal Articles

Orientation relationship between $$alpha$$-phase and high-pressure $$omega$$-phase of pure group IV transition metals

Adachi, Nozomu*; Todaka, Yoshikazu*; Suzuki, Hiroshi; Umemoto, Minoru*

Scripta Materialia, 98, p.1 - 4, 2015/03

 Times Cited Count:10 Percentile:54.65(Nanoscience & Nanotechnology)

The deformation texture of the high-pressure $$omega$$-phase of pure group IV metals was investigated using neutron diffraction analysis. The $$<$$0001$$>$$$$omega$$ direction gradually aligned to the shear direction with an increase in the shear strain introduced by the high-pressure torsion process. The deformation texture suggested that the main slip system of the $$omega$$-phase was {11-20}$$<$$0001$$>$$$$omega$$. We experimentally observed the orientation relationships of the mechanically stabilized $$omega$$-phase with respect to the reverse-transformed $$alpha$$-phase, and determined that the relationship was similar to that proposed by Silcock and Rabinkin.

Journal Articles

The Inhabitants' receiving disaster information and their reaction at the JCO criticality accident in Tokai-mura

Umemoto, Michitaka; Kobayashi, Kensuke; Ishigami, Tsutomu; Watanabe, Minoru*

Chiiki Anzen Gakkai Kogaishu, 10, p.113 - 116, 2000/11

On September 30 in 1999, the reactivity accident occurred at the Tokai uranium processifn facility of J. C. O. Co. Ltd(JCO) at Tokai-mura, Japan. Before the accident had been brought under control, the local authorities evacuated the population living within a few hundred meters and advised people within 10km of the facility to take shelter for a period of about one day. Questionnaires were conducted to know when, where and how the inhabitants received the information of protective action requests from the local authories and how they responded to the requests.

Oral presentation

Thermal expansion behavior of iron carbide Fe$$_{3}$$C

Harjo, S.; Shiota, Yoshinori*; Yonemura, Masao*; Tomota, Yo*; Kamiyama, Takashi*; Umemoto, Minoru*

no journal, , 

Iron Carbide Fe$$_{3}$$C (called "cementite") is an important phase for engineering steels. The amount and shape of cementite determine mechanical and thermal properties of the steels. Cementite is also suggested as the major phase in the inner core of the centre of the earth. However, since the cementite single-phase specimen was so difficult to prepare, its physical properties have not been examined well. Recently, the preparation of cementite bulky specimen has been performed by using plasma-sintering with mechanical milling. The lattice parameters of the prepared bulky pure cementite and Mn-alloyed cementite were measured at VEGA-KENS (Time-of-Flight neutron powder diffractometer) in a temperature range from room temperature to 673 K, to determine their thermal expansion coefficients. Results of the measurements will be presented.

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