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A Study on SiC Particulates Reinforced Al-Li Composites Consolidated by Hot Isostatie Pressing
Hanada, K .,Murakoshi, Y .,Negishi, H .,Sano, T. 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
SiC particulates reinforced Al-Li (Al-Li/SiCp) composite powders were produced by mechanical milling and were consolidated by hot isostatic pressing (HIP) at various temperatures and pressures. Prior to HIP, the composite powders compacted upto a relative density of 80% were put into a steel capsule and were degassed while heating. Thermogravity analysis revealed that the moisture adsorbed on the surface of composite powders could be removed at 508 K. Based on the result, degassing was carried out at 573 K and 773 K for 1 hour. SiC particulates of HIPped specimens were aggregated on the prior particle boundaries of Al-Li matrix powders under all HIP conditions. The density and tensile strength of HIPped specimens increased and the ductility decreased with increasing HIP temperature and pressure.
Jung, T.K.,Semboshi, S.,Masahashi, N.,Hanada, S. Elsevier 2013 Materials science & engineering. C, Materials for Vol.33 No.3
The mechanical properties and microstructures of β Ti-25%Nb-11%Sn ternary alloy rods were investigated for biomedical applications as a function of heat treatment temperature after swaging by an 86% reduction in cross-section area. An as-swaged rod consisting of a β (bcc) single phase shows a low Young's modulus of 53GPa, which is interpreted in terms of both the metastable composition of the β alloy undergoing neither an athermal ω transformation nor a deformation-induced ω transformation and <110>texture development during swaging. Heat treatment at 673K (400<SUP>o</SUP>C) for 2h leads to a high strength of approximately 1330MPa and a high spring-back ratio of yield stress to Young's modulus over 15x10<SUP>-3</SUP>, with acceptable elongation. This high strength is attributable to needle-like α precipitates, which are identified by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and high-resolution electron microscopy (HREM).
the NB Heating Technology Group,Kojima, A.,Hanada, M.,Jeong, S.H.,Bae, Y.S.,Chang, D.H.,Kim, T.S.,Lee, K.W.,Park, M.,Jung, B.K.,Mogaki, K.,Komata, M.,Dairaku, M.,Kashiwagi, M.,Tobari, H.,Watanabe, K. North-Holland ; Elsevier Science Ltd 2016 Fusion engineering and design Vol.102 No.-
The long-pulse acceleration of the high-power positive ion beam has been demonstrated with the JT-60 positive ion source in the joint experiment among Japan Atomic Energy Agency (JAEA), Korea Atomic Energy Research Institute (KAERI) and National Fusion Research Institute (NFRI) under the collaboration program for the development of plasma heating and current drive systems. In this joint experiment, the increase of the heat load and the breakdowns induced by the degradation of the beam optics due to the gas accumulation was one of the critical issues for the long-pulse acceleration. As a result of development of the long-pulse operation techniques of the ion source and facilities of the neutral beam test stand in KAERI, 2MW 100s beam has been achieved for the first time. The achieved beam performance satisfies the JT-60SA requirement which is designed to be a 1.94MW ion beam power from an ion source corresponding to total neutral beam power of 20MW with 24 ion sources. Therefore, it was found that the JT-60 positive ion sources were applicable in the JT-60SA neutral beam injectors. Moreover, because this ion source is planned to be a backup ion source for KSTAR, the operational region and characteristic has been clarified to apply to the KSTAR neutral beam injector.
Effect of swaging on Young@?s modulus of β Ti-33.6Nb-4Sn alloy
Hanada, S.,Masahashi, N.,Jung, T.K.,Miyake, M.,Sato, Y.S.,Kokawa, H. Elsevier 2014 Journal of the mechanical behavior of biomedical m Vol.32 No.-
The effect of swaging on the Young's modulus of β Ti-33.6Nb-4Sn rods was investigated by X-ray diffraction, thermography, microstructural observations, deformation simulator analysis and cyclic tensile deformation. Stress-induced α'' martensite was stabilized by swaging, dependent on the diameter reduction rate during swaging. Thermography and deformation simulator analysis revealed that swaged rods were adiabatically heated, and consequently, stress-induced α'' underwent reverse transformation. Young's modulus, which was measured by the slope of the initial portion of the stress-strain curve, decreased from 56GPa in the hot-forged/quenched rod to 44GPa in the rapidly swaged rod with a high reduction rate and to 45GPa in the gradually swaged rod with a low reduction rate. The tangent modulus, which was measured by the slope of the tangent to any point on the stress-strain curve, decreased with strain even in the linear range of the stress-strain curve of the hot-forged/quenched rod and the rapidly swaged rod, while the tangent modulus remained unchanged for the gradually swaged rod. It was found that Young's moduli in swaged β Ti-33.6Nb-4Sn rods were affected by stabilized α'' martensite. Low Young's modulus of 45GPa and high strength over 800MPa were obtained when the reverse transformation by adiabatic heating was suppressed and the stress-induced α'' was sufficiently stabilized by gradual swaging to a 75% reduction in cross section area.
Ohboshi, S.,Hanada, K.,Zhao, J.,Hattori, M.,Fujihara, N.,Umetsu, R.,Yoshida, T.,Tomogane, H. Asian Australasian Association of Animal Productio 1996 Animal Bioscience Vol.9 No.5
The purpose of this study was to evaluate some factors in the bovine embryonic development from one-cell to blastocyst using modified synthetic oviduct fluid medium (mSOFM), after maturation and in vitro fertilization of the oocytes. The embryonic development to the blastocyst stage was assessed at 7-10 days after in vitro fertilization, and the total cells in the blastocysts were counted by staining nuclei with fluorochrome. Some commercial calf sera (CS) and a superovulated cow serum had different effects on the embryonic development to the blastocyst stage (8.6-21.4%), dependent upon their product lots, although the development might not be affected at least by serum progesterone levels. ${\beta}$-Mercaptoethanol (${\beta}$-ME) supplemented into mSOFM was effective to the embryonic development (27.8%), as well as the co-culture system with cumulus cells (19.5%). In a serum- and feeder cell-free culture using mSOFM containing several growth factors and ${\beta}$-ME instead of CS plus co-cultured cumulus cells, bovine serum albumin (BSA, fraction V), but not polyvinyl alcohol (PVA), was highly effective in embryonic development to the blastocyst stage, almost comparable to CS in the serum-contained culture (CS, BSA and PVA; 27.8, 19.5 and 5.7%, respectively). However, fatty acid free BSA rather reduced the number of developed blastocysts, compared with fraction V BSA (7.3 vs 29.4%). In the serum- and feeder cell-free culture, supplement of glucose to the medium (final 2.0 mM) stimulated the cell proliferation of developing embryos 120 hr after in vitro fertilization. These results indicated that a serum-free medium supplemented with ${\beta}$-ME could successfully support the development of bovine one-cell embryos to the blastocyst stage. Moreover, supplement of glucose and fatty acids to the medium might support preferably the development and cell proliferation of embryos.
ULTRASTRUCTURAL COMPARISON OF BOVINE BLASTOCYSTS DEVELOPED IN VIVO AND IN VITRO
Ohboshi, S.,Nakamichi, R.,Hanada, K.,Zhao, J.,Hattori, M.,Fujihara, N.,Umetsu, R. Asian Australasian Association of Animal Productio 1995 Animal Bioscience Vol.8 No.6
The ultrastructures of in vitro-derived bovine blastocysts have been compared with those of blastocysts obtained from a superovulated cow. In vivo blastocysts obtained from the uterus showed well-differentiated features, while in vitro-derived embryos, which were developed from in vitro fertilized ovum, showed insufficient cellular organizations. In vitro-derived embryos contained many undefined cellular organizations in the perivitelline spaces compared with in vivo-derived blastocysts. Other features of in vivo and in vitro blastocysts were characterized by differential development of microvilli projection into blastocoele from the surface of the trophoblast cells. The conceivable reason for the difference between in vivo and in vitro developments of bovine embryos is that it is likely that in vitro culture system adopted in the present experiment may not be sufficient for better embryonic development.
Electronic structure of Ga1-x CrxN investigated by photoemission spectroscopy
J.J.Kim,H.Makino,K.Yamazaki,A.Ino,H.Namatame,M.Taniguchi,T.Hanada,M.W.Cho,T.Yao 한국물리학회 2004 Current Applied Physics Vol.4 No.6
We have obtained the Cr 3d-like energy states, which located in the band gap of GaN by means of resonant photoemission spectroscopy. In the dierence spectrum between the valence band photoemission spectra of non-doped GaN and that of theGa0:937Cr0:063N, we observed the new energy state, in band gap, consists of Cr 3d-like and N 2p-like component by strong hybridization.
Structural Properties of CrN Buffers for GaN Growth
W. H. Lee,오동철,한창석,이현용,I. H. Im,J. J. Kim,K. Sumitani,구경완,M. W. Cho,O. Sakata,조성준,홍순구,S. T. Kim,T. Minegishi,T. Yao,T.Hanada 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
We have investigated the structural properties of CrN layers grown on (0001) Al2O3 substrates by molecular-beam epitaxy. The CrN layers of high-crystal quality are obtained at a low growth temperature of 500 C. X-ray diraction studies indicate that the CrN layers grow along the <111> direction with a cubic structure. In-situ reflection high-energy electron diraction investigations clarify that the CrN layers have the following epitaxy relationship with the Al2O3 substrates: <12- 1> of (111) cubic CrN // <11-20> of (0001) corundum Al2O3 and <101> of (111) cubic CrN // <1-100> of (0001) corundum Al2O3. Based on the above results, the mismatch of the in-plane lattice spacing between the CrN layers and the Al2O3 substrates is evaluated to be around 6.6 %. When the CrN layers are used as the buer layers for GaN growth, the GaN layers grown on the CrN layers show well-resolved excitonic emission lines in the photoluminescence spectra, whereas the GaN layers grown without the CrN layers exhibit a broad near-band-edge emission. It is suggested that CrN buers are eective in relieving the lattice mismatch between Al2O3 substrates and GaN layers.