Pressure-temperature-field phase diagram in the ferromagnet UP

Araki, Shingo*; Hayashida, Minami*; Nishiumi, Naoto*; Manabe, Hiroki*; Ikeda, Yoichi*; Kobayashi, Tatsuo*; Murata, Keizo*; Inada, Yoshihiko*; Winiewski, P.*; Aoki, Dai*; et al.

Journal of the Physical Society of Japan, 84(2), p.024705_1 - 024705_8, 2015/02

https://doi.org/10.7566/JPSJ.84.024705

Evaluation of the system free energy in FG-HAZ of Mod.9Cr-1Mo steel for nuclear power plants

Iwata, Mitsunao*; Sugiyama, Yuichi*; Murata, Yoshinori*; Takaya, Shigeru

Defect and Diffusion Forum, 326-328, p.578 - 582, 2012/04

https://doi.org/10.4028/www.scientific.net/DDF.326-328.578

no abstracts in English

Azimuthal correlations of electrons from heavy-flavor decay with hadrons in and Au+Au collisions at = 200 GeV

Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.

Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04

https://doi.org/10.1103/PhysRevC.83.044912

Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to collisions.

Phase-field simulation of nucleation and growth of MC carbide and ferromagnetic phases during creep deformation in Type 304 steel

Tsukada, Yuki*; Shiraki, Atsuhiro*; Murata, Yoshinori*; Takaya, Shigeru; Koyama, Toshiyuki*; Morinaga, Masahiko*

Journal of Nuclear Materials, 401(1-3), p.154 - 158, 2010/06

https://doi.org/10.1016/j.jnucmat.2010.04.017

A phase-field method was applied to the simulation of simultaneous nucleation and growth of both MC carbide and ferromagnetic phases during the creep process in Type 304 steel. The defect energy of the creep dislocations near the carbides, which increases during creep, was integrated into the nucleation driving force for the phase. The simulation used in this study accurately reproduced changes in the amounts of the precipitated phases as a function of creep time. Furthermore, we examine the effect of the dislocation density on precipitation of the phase, and show that the phase-field method is useful for examining the stochastic and kinetic phenomenon of phase transformation.

Irradiation test for verification of PWR 48GWd/t high burnup fuel

Okubo, Tadatsune*; Tsukuda, Yoshiaki*; Kamimura, Katsuichiro*; Murai, Kenji*; Goto, Ken*; Doi, Soichi*; Senda, Yasuhide*; Kosaka, Yuji*; Kido, Toshiya*; Murata, Tamotsu*; et al.

Nihon Genshiryoku Gakkai-Shi, 43(9), p.906 - 915, 2001/09

https://doi.org/10.3327/jaesj.43.906

no abstracts in English

Phase-field simulation on the formation of ferromagnetic phase during creep deformation in SUS304 steel

Tsukada, Yuki*; Shiraki, Atsuhiro*; Murata, Yoshinori*; Morinaga, Masahiko*; Takaya, Shigeru; Koyama, Toshiyuki*

no journal, , 

The formation of the ferromagnetic phase during creep deformation in SUS304 steel was simulated by aphase-field method. In order to consider the precipitation and growth of the phase simultaneously, we haveconstructed a model based on experimental results. In this model, strain energy stored near carbideduring creep deformation increases the driving force for precipitation of the phase. This strain energy isestimated on the basis of distribution function of dislocation density in space near the carbide and is used inthe calculation of the activation energy for nucleation of the phase. Changes in mole fraction of both carbide and the phase are reproduced well in this simulation. Furthermore, it is found that theincrease rate of dislocation density during creep process affects the manner of the change in mole fraction ofthe phase.

Phase-field simulation on phase transformation during creep deformation in type 304 steel

Tsukada, Yuki*; Shiraki, Atsuhiro*; Murata, Yoshinori*; Takaya, Shigeru; Koyama, Toshiyuki*; Morinaga, Masahiko*

no journal, , 

Phase-field simulation of phase transformation during creep in Type 304 austenitic steel is performed and simultaneous nucleation and growth of both carbide and ferromagnetic phases are reproduced. Nucleation events of these product phases are explicitly introduced through a probabilistic Poisson seeding process based on the classical nucleation theory. Creep dislocation energy near the carbide is integrated into the nucleation driving force for the phase. We examine the effect of the dislocation density on precipitation of the phase, and it is found that a small difference in the dislocation density leads to a significant change in precipitation behavior of the phase.

Control of molecular symmetry and luminescence properties of lanthanide complexes using octadentate oligopyridine-amine ligands

Wada, Atsushi; Watanabe, Masayuki; Yamanoi, Yoshinori*; Murata, Masaki*; Nishihara, Hiroshi*

no journal, , 

Lanthanide complexes with linear and cyclic octadentate oligopyridine-amine ligands were newly synthesized, and their molecular structures were determined by single-crystal X-ray crystallography. All of the complexes formed with the distorted CSAP geometry, the symmetry of which was higher for the complexes with the cyclic ligand than those with the linear ligand. The Eu and Tb complexes showed intense luminescence due to energy transfer from the ligand to the metal center (antenna effect). The Eu complexes with the linear ligand showed more intense emissions attributed to the 5D07F2 transition than the complex with the cyclic ligand, which can be explained by the decrease in symmetry around the lanthanide ion. The coordination of water molecules to Eu and Tb ions was strongly inhibited by surrounding the metal ions with the cyclic ligand, resulting in an appearance of intense luminescence in water. These results indicate that the symmetry and stability of lanthanide complexes, and thus the luminescence properties, can be successfully controlled by tuning the geometrical structures of multi-dentate ligands.

Evaluation of creep strain energy related to formation of ferro-magnetic phase in SUS304

Tsukada, Yuki*; Shiraki, Atsuhiro*; Murata, Yoshinori*; Morinaga, Masahiko*; Takaya, Shigeru; Koyama, Toshiyuki*

no journal, , 

no abstracts in English

Phase-field simulation on the formation of ferromagnetic phase induced by creep strain in SUS304 steel

Tsukada, Yuki*; Shiraki, Atsuhiro*; Murata, Yoshinori*; Koyama, Toshiyuki*; Takaya, Shigeru; Morinaga, Masahiko*

no journal, , 

Phase-field simulation was conducted based on thermodynamic data base and experimental data on dislocation density near carbides to reveal the relationship between carbide and the formation of ferromagnetic phase in SUS304. The results showed that it is important to consider change in dislocation density near carbides and threshold stress for the formation of ferromagnetic phase to show quantitative relationship between damage at elevated temperature and the content of ferromagnetic phase.