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| 1 | Dynamic recrystallization and texture development during hot deformation of magnesium alloy AZ31显示文摘The dynamic recrystallization(DRX) and texture development, taking place during hot deformation of magnesium alloy AZ31 with a strong wire texture, were studied in compression at 673 K (0.73 Tm). Two kinds of samples were machined parallelly to the extruded and transverse directions of Mg alloy rods. New fine grains are evolved at original grain boundaries corrugated at low strains and develop rapidly in the medium range of strain, finally leading to a roughly full evolution of equiaxial fine grains. Kink bands are evolved at grain boundaries corrugated and also frequently in grain interiors at low strains. The boundary misorientations of kink band increase rapidly with increasing strain and approach a saturation value in high strain. The average size of the regions fragmented by kink band is almost the same as that of new grains evolved in high strain. These characteristics of new grain evolution process are not changed by the orientation of the samples, while the flow behaviors clearly depend on it. It is concluded that new grain evolution can be controlled by a deformation-induced continuous reaction, i.e. continuous dynamic recrystallization(DRX). The latter is discussed by comparing with conventional, i.e. discontinuous DRX. | 杨续跃 吉泽升 H. MIURA T. SAKAI | 2009 | 中国有色金属学会会刊:英文版2009，19，1： | 16 |
| 2 | Recrystallization behaviour of fine-grained magnesium alloy after hot deformation显示文摘Annealing behaviors of hot-deformed magnesium alloy AZ31 were studied at temperatures from 300 to 673 K by optical and SEM/EBSD metallographic observation. Temperature dependence of the average grain size(D) is categorized into three temperature regions, i.e. an incubation period for grain growth, rapid grain coarsening, and normal grain growth. The number of fine grains per unit area, however, is reduced remarkably even in incubation period. This leads to grain coarsening taking place continuously in the whole temperature regions. In contrast, the deformation texture scarcely changes even after full annealing at high temperatures. It is concluded that the annealing processes operating in hot-deformed magnesium alloy with continuous dynamic recrystallized grain structures can be mainly controlled by grain coarsening accompanied with no texture change, that is, continuous static recrystallization. | 杨续跃 H. Miura T. Sakai | 2007 | 中国有色金属学会会刊:英文版2007，17，6： | 8 |
| 3 | Microstructure and mechanical properties of AZ61 Mg alloy prepared by multi directional forging显示文摘AZ61Mg alloy was multi directionally forged(MDFed) during decreasing temperature condition from 643 K to 483 K at a true strain rate of 3×10-3 s-1 up to cumulative strain of∑△ε=4.0 at maximum.A pass strain of△ε=0.8 was employed.While average grain size decreased gradually with increasing cumulative strain,the evolution of fine-grained structure strongly depended on the MDF temperature.Under the condition where the temperature was higher than the most adequate one,grain coarsening partially took place during MDF.In contrast,at lower temperature,inhomogeneous microstructure composed of the initial coarse and newly appeared fine grains was evolved.After straining over∑△ε=3.2(i.e.,over 4 passes of MDF) ,equiaxed ultrafine grains(UFGs) having average size of about and lower than 1μm were uniformly evolved.While the MDFed alloy to∑△ε=4.0 possessed relatively high hardness of HV 99,and it accepted further about 20%cold rolling almost without cracking.Because of the superior formability of the UFGed AZ61Mg alloy,the hardness was further easily raised to HV 120 by following cold rolling. | H. MIURA G. YU X. YANG T. SAKAI | 2010 | Transactions of Nonferrous Metals Society of China2010，20，7： | 7 |
| 4 | Imaging of calvarial eosinophil granuloma显示文摘 | K. Okamoto J. Ito T. Furusawa K. Sakai S. Tokiguchi | 1999 | Neuroradiology1999，，10： | 1 |
| 5 | Insulin down-regulates resistin mRNA through the synthesis of protein(s) that could accelerate the degradation of resistin mRNA in 3T3-L1 adipocytes显示文摘 | J. Kawashima K. Tsuruzoe H. Motoshima A. Shirakami K. Sakai Y. Hirashima T. Toyonaga E. Araki MD PhD | 2003 | Diabetologia2003，，2： | 1 |
| 6 | Rebound prediction of excavated ground using anisotropic elastic finite element analysis显示文摘 | K. Sakai J. Mitsuo T. Tanaka | 1997 | Tunnelling and Underground Space Technology incorporating Trenchless Technology Research1997，，1： | 1 |
| 7 | Imaging intracranial haemangiopericytomas: study of seven cases显示文摘 | M. Akiyama H. Sakai H. Onoue Y. Miyazaki T. Abe | 2004 | Neuroradiology2004，，3： | 1 |
| 8 | Appendiceal mucocele: sonographic findings显示文摘 | K. Sasaki H. Ishida T. Komatsuda T. Suzuki K. Konno M. Ohtaka M. Sato J. Ishida T. Sakai S. Watanabe | 2003 | Abdominal Imaging2003，，1： | 1 |
| 9 | A loop mediated isothermal amplification (LAMP) method for detection of infectious hematopoietic necrosis virus (IHNV) in rainbow trout (Oncorhynchus mykiss)显示文摘 | I. Gunimaladevi T. Kono S. E. LaPatra M. Sakai | 2005 | Archives of Virology2005，，5： | 1 |
| 10 | Performance of bispectral index and auditory evoked potential monitors in detecting loss of consciousness during anaesthetic induction with propofol with and without fentanyl显示文摘 | W. D. Mi T. Sakai T. Kudo M. Kudo A. Matsuki | 2004 | European Journal of Anaesthesiology2004，，10： | 1 |
| 11 | Interfacial phenomena in the liquid copper-calcium ferrite slag system显示文摘 | T. Sakai S. W. Ip J. M. Toguri | 1997 | Metallurgical and Materials Transactions B1997，，3： | 1 |
| 12 | Surgical treatment of cavernous angioma involving the brainstem and review of the literature显示文摘 | N. Sakai H. Yamada T. Tanigawara Y. Asano T. Andoh Y. Tanabe M. Takada | 1991 | Acta Neurochirurgica (-)1991，，3： | 1 |
| 13 | MODELING THE STRESS-STRAIN CURVES UNDER DYNAMIC RECRYSTALLIZATION显示文摘An analytical model for dynamic recrystallization (DRX) is studied based on the relative grain size model proposed by Sakai and Jonas, and the characteristic flow behaviors under DRX are analyzed and simulated. Introducing the variation of dynamic grain size and the heterogeneous distribution of disolo- cation densities densities under DRX,a simple method for modeling and simulating DRX processes is developed by using Laplace transformation theory. The results derived from the present model agree well with the experimental results in literatures. This simulation can reproduce a number of features in DRX flow behaviors, for example,single and multiple peak flow behaviors followed by a steady state flow, the transition between them, and so on. | W. Gao T. Sakai and H. Miura( Department of Mechanical Engineering and Intelligent Systems, The University of Electro - Communica- tions, Chofu, Tokyo 182 - 8585, Japan) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，1： | 1 |
| 14 | Grain refinement in a commercial Al–Mg–Sc alloy under hot ECAP conditions显示文摘 | O. Sitdikov T. Sakai E. Avtokratova R. Kaibyshev Y. Kimura K. Tsuzaki | 2006 | Materials Science & Engineering A2006，，1： | 1 |
| 15 | Statistical duplex S – N characteristics of high carbon chromium bearing steel in rotating bending in very high cycle regime显示文摘 | T. Sakai B. Lian M. Takeda K. Shiozawa N. Oguma Y. Ochi M. Nakajima T. Nakamura | 2009 | International Journal of Fatigue2009，，3： | 1 |
| 16 | A study of tritium decontamination of deposits by UV irradiation显示文摘 | Y. Oya W. Shu S. O’hira T. Hayashi H. Nakamura T. Sakai T. Tadokoro K. Kobayashi T. Suzuki M. Nishi | 2001 | Journal of Nuclear Materials2001，，： | 1 |
| 17 | Effect of deformation temperature on microstructure evolution in aluminum alloy 2219 during hot ECAP显示文摘 | I. Mazurina T. Sakai H. Miura O. Sitdikov R. Kaibyshev | 2007 | Materials Science & Engineering A2007，，1： | 1 |
| 18 | Indications for the use of endoscopic mucosal resection for early gastric cancer in Japan: a comparative study with endoscopic submucosal dissection显示文摘 | S. Nakamoto Y. Sakai J. Kasanuki F. Kondo Y. Ooka K. Kato M. Arai T. Suzuki T. Matsumura D. Bekku K. Ito T. Tanaka O. Yokosuka | 2009 | Endoscopy2009，，09： | 1 |
| 19 | Cascadating fracture in a laminated tempered safety glass panel显示文摘 | T. Sakai M. Ramulu A. Ghosh R. C. Bradt | 1991 | International Journal of Fracture1991，，1： | 1 |
| 20 | Sinterability and electrical conductivity of calcium-doped lanthanum chromites显示文摘 | N. Sakai T. Kawada H. Yokokawa M. Dokiya T. Iwata | 1990 | Journal of Materials Science1990，，10： | 1 |
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