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K. Tahara,Y. Fukuda,G. Wakabayashi,H. Ban,Y. Morimoto,M. Yoshioka,K. Kiyohara,Y. Koba,H. Iwamoto,Y. Uozumi,N. Matsufuji 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
We measured proton-production double differential cross sections (DDXs) by 290 MeV/u carbon beams on carbon, copper, lead targets at forward angles. The proton energies were measured with the spectrometer which consisted of GSO(Ce) crystals and plastic scintillators. The measured DDXs were compared with the calculated ones with PHITS code. The simulation results generally agreed with the measured ones. The measured results will be useful as the benchmark of existing simulation codes and for the future improvements.
Lattice modulation and superelasticity in oxygen-added β-Ti alloys
Tahara, M.,Kim, H.Y.,Inamura, T.,Hosoda, H.,Miyazaki, S. Elsevier Science 2011 ACTA MATERIALIA Vol.59 No.16
The microstructure and martensitic transformation behavior of (Ti-23Nb)-1.0O (at.%) alloy have been closely and systematically investigated by transmission electron microscopy (TEM). Diffuse streaks along the <110><SUB>β</SUB><SUP>*</SUP> directions with intensity maxima at ½ positions between basal spots are observed in selected area diffraction patterns obtained from the β phase. The streaks correspond to six variants of {110}<SUB>β</SUB><11@?0><SUB>β</SUB> transverse lattice modulation caused by randomly distributed oxygen atoms and their local strain fields. Nanosized modulated domains (nanodomains) in the β phase are confirmed in dark field micrographs. These nanodomains act as local barriers to martensitic transformation, thereby suppressing long-range martensitic transformation in the (Ti-23Nb)-1.0O alloy. We suggest a new mechanism for superelasticity in oxygen-containing β-Ti-Nb alloys based on the results of in situ X-ray diffraction measurements and in situ TEM observations.
Tahara, M.,Kim, H.Y.,Hosoda, H.,Nam, T.h.,Miyazaki, S. Elsevier Sequoia 2010 Materials science & engineering. properties, micro Vol.527 No.26
The composition dependence of the mechanical properties and martensitic transformation behavior of Ti-Nb-4Zr-2Ta-N alloys is investigated. The effect of annealing temperature on the microstructural evolution and superelastic properties in the N-added and N-free alloys is compared. The addition of N decreases M<SUB>s</SUB> of Ti-Nb-4Zr-2Ta alloys by about 200K per 1at.%N and improves the superelastic properties of Ti-Nb-4Zr-2Ta alloys. The dissolution of α phase increases the martensitic transformation start temperature and decreases the superelastic recovery strain for the N-free alloy, whereas it causes opposite effects for the N-added alloy. The different annealing temperature dependences of superelastic properties are discussed on the basis of microstructure observation.
Kim, H.Y.,Wei, L.,Kobayashi, S.,Tahara, M.,Miyazaki, S. Elsevier Science 2013 ACTA MATERIALIA Vol.61 No.13
The microstructure and thermal expansion behavior of a Ti-23Nb-2Zr-0.7Ta-1.2O alloy (Gum metal) were investigated. A systematic diffraction pattern analysis using transmission electron microscopy revealed that a {11@?0}<110>-type transverse lattice modulation is present in the Ti-23Nb-2Zr-0.7Ta-1.2O alloy. Martensite-like nanodomains corresponding to {11@?0}<110>-type lattice modulations were observed in dark-field micrographs. Six variants of lattice modulation were confirmed to be distributed equivalently in the β phase in the annealed condition. Cold rolling resulted in preferential growth of a nanodomain variant which is most suited to releasing the applied stress although the long-range martensitic transformation was prevented by the local stress of the domain structure caused by oxygen atoms. It is suggested that the very small thermal expansion coefficient in the as-rolled specimen is caused by the preferential growth of the nanodomain variant due to residual stress.
Quality Management System Proposed to JENDL Evaluation Project
N. Yamano,T. Yoshida,K. Nakajima,M. Ishikawa,K. Shibata,M. Uematsu,Y. Tahara 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A concept of the quality management system proposed for the Japanese Evaluated Nuclear Data Library (JENDL) is described. The concept is based on the process approach established as an International Standard of a quality management system (ISO 9001). In order to discuss how to guarantee the quality of JENDL, a working group focusing on a quality assurance strategy was established in the Japanese Nuclear Data Committee. After three years of discussions, the working group published a report about a quality management system for JENDL and proposed this work to the JENDL evaluation group of the Japan Atomic Energy Agency. The concept of quality management system of JENDL consists of five items: (1) Objective, (2) Organization, (3) Scope, (4) Quality Assurance, and (5) Quality Manual. The concept of the quality management system and the documented procedure have been presented.