10 Selected Papers　　Publications in 1991-2001

Born
At the Township of Haruki-cho, Bunkyo District of Tokyo,
now a part of Hongo-Sanchome, used to be counted as one of the honorable 808 townships of old metropolitan Edo.

Playgrounds in Childhood:
Campus of Univ. Tokyo (the San-Shiro pond, the followings are already lost; camellia hill and huge anti-fire reservoir, disposal yard for crystal ores and fossils, woods with a stone statue of eagle)
Shinobazu Pond (catching long-armed shrimps and picking lotus seeds)
Kanda River (catching gold fish after typhoon flood)

Hobbies
Painting (only an art-museum goer after high school)
Books (contemporary French novels and philosophy in college days, history books and Y. Uchida's suspense novels nowadays)
Paper Glider (some people might denounce it's merely a paper plane)

Education
1966-1969 Hibiya High School, Tokyo
1969-1973 Dept. Metallic Materials Eng., Tohoku Univ.
Adviser: Prof. Seiichi KARASHIMA, Metal Strength Lab.
1973&1975 Dept. of Metall. Eng., Graduate School, Univ. of Tokyo
Advise: Prof. Toru ARAKI, Steel Materials Lab.
1973-1978 Dept. Mater. Sci., Graduate School, Northwestern Univ.
Adviser: Prof. Mike Meshii, Point Defects & Materials Strength Lab.

Degree
M.S. in Materials Science, Northwestern University
Relationship between Irradiation Softening and Dislocation Structure in Ultra-pure Fe Single Crystals
Ph.D. in Materials Science , Northwestern University
Low Temperature Deformation and Irradiation Effect on High Purity Nb Single Crystals

Professional Career
1978-1979 Principal Research Associate, Northwestern University
Strength of BCC Metals and Effects of Solute Atoms and Surface
Adviser for Graduate Students
1980-1981 Researcher, Dept. Mater. Sci., Argonne National Lab.
DOE Damage Analysis and Fundamental Studies, Fusion Prog.
(Experimental and Theoretical Studies of Irradiation Creep)
1981-1983 Researcher, National Research Institute for Metals
Light-Ion Irradiation Creep Testing Technology
1983-1990 Senior Researcher, NRIM
Irradiation Creep of Fusion Reactor Materials
In-Situ Deformation of Irradiated Materials in HVEM
1990-2001 Subgroup Leader, NRIM
Experimental and Theoretical Studies of Radiation-Induced Deformation and Fatigue under Irradiation
2001-2010 Director, National Institute for Materials Science
Experimental and Theoretical Studies of Radiation-Induced Deformation and Fatigue under Irradiation

1998-2010 Professor, Faculty of Engineering Sciences, Graduate School, Kyushu University

Present 　Deputy General-Manager and Manager of Academic Relations Section, Academic Collaboration Office, NIMS

Simultaneous Appontment
1990-1991 Specialist Staff (Fusion Research), Science and Technology Agency, Japanese Government
1986 Visiting Scientist, Dept. Mater. Sci., Argonne Nat. Lab.
In-Situ Deformation of V Alloys for Fusion Application in HVEM
1992-1995 Research Adviser (Fusion Research), Japan Atomic Energy Research Institute

Field of Interest
Deformation of BCC Metals (Deformation Mechanisms, Effects of Point Defects, Solute Atoms, Surfaces)
Radiation Induced Deformation (Experimental and Theoretical Aspects of Irradiation Creep and Irradiation Induced Stress Relaxation)
Fatigue Phenomena under Irradiation

Professional Association
Japan Atomic Energy Association,
Japan Institute of Metals,
Plasma and Fusion Association

Ten Selected Papers

"Deformation Structure in Ultra-pure Iron",
Johsei Nagakawa, A. Sato and M. Meshii,
Philosophical Magazine, 32 (1975), 1107-1128.
My first paper (thesis work for M.S.). Awarded a Prize by US Midwestern Society for Electron Microscopists.
Irradiation softening of Fe was shown not to be caused by an increase of dislocation density through TEM examination of thin foil specimens non-perforated for a preservation of the extremely fragile dislocation structure.

"Effect of Electron Irradiation on the Low Temperature Deformation of Niobium",
Johsei Nagakawa, M. Meshii and B. A. Loomis,
Scripta Metallurgica, 13 (1979), 241-244.
First observation of irradiation hardening and softening produced in a sole Nb single crystal irradiated with electrons, depending only on the tensile direction, at low temperatures.

"The Deformation of Niobium Single Crystals at Temperatures between 77K and 4.2K",
Johsei Nagakawa and M. Meshii,
Philosophical Magazine A, 44 (1981), 1165-1191.
This paper closed the long-lasting "intrinsic vs. extrinsic" controversy on the rapid yield stress increase of BCC metals at low temperatures between Va metals and Fe-VIa metals research groups.

"Examination of Surface Effects on Low-Temperature Deformation of Niobium",
Johsei Nagakawa and M. Meshii,
Philosophical Magazine A, 45 (1982), 983-1002.
It showed the disappearance of two opposing properties of the low temperature deformation of Nb, due to the surface amorphous oxide film of thickness only a several of tens nm.

"Irradiation Creep in Simple Binary Alloys",
Johsei Nagakawa, V. K. Sethi and A. P. L. Turner,
J. of Nuclear Materials, 103-104 (1982), 1275-1280.
This paper fully explored experimentally the various aspects of irradiation creep properties, first time in a full set of data for a single materials.

"Irradiation Creep Transient in Ni-4 at% Si",
Johsei Nagakawa,
J. of Nuclear Materials, 116 (1983), 10-16.
It showed that the irradiation creep can be further enhanced by the transient of point defect kinetics associated with suspension of irradiation. Practically important in relation to the cyclic and pulse operation of fusion reactors etc.

"Computer Simulation of Early-Stage Irradiation Creep ",
Johsei Nagakawa, N. Yamamoto and H. Shiraishi,
J. of Nuclear Materials, 179-181 (1991), 986-989.
It reported for the first time the computer simulation of radiation-induced deformation by coupling the rate theory of point defects "under stress" and the major deformation mechanisms, simultaneously operating and competing for the point defects with each other.

"Calculation of Irradiation-Induced Stress Relaxation",
Johsei Nagakawa,
J. of Nuclear Materials, 212-215 (1994), 541-545.
Computer simulation showed that the radiation-induced deformation can be more enhanced at lower temperature region (60C) due to the transient behavior of point defect kinetics.

"Calculation of Irradiation-Induced and Stress Relaxation",
Johsei Nagakawa,
J. of Nuclear Materials, 225 (1995), 1-7.
Computer simulation was first applied to light-water reactors. It was found that the irradiation-induced stress relaxation is very important even with the low atomic displacement rate of LWR environment.

"Irradiation Creep at 60℃ in SUS 316 and Its Impact on Fatigue Fracture",
Johsei Nagakawa, Y. Murase, N. Yamamoto and T. Fukuzawa,
J. of Nuclear Materials, 283-287 (2000), 391-395.
Prediction of the significant enhancement of irradiation creep at a low temperature (60C) was experimentally proved, and its strong impact on the fatigue fracture was shown to elongate the lifetime through dynamic irradiation effects.

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Publications in 1991-2001
(reviewed papers, proceedings, review articles)

2001
"Comparison of In-Beam Fatigue Behavior between Austenitic and Ferritic Steels at 60C",
Y. Murase, J. Nagakawa and N. Yamamoto,
J. Nucl. Mater., (2001), submitted.

"In-Beam Fatigue Response of a Low Activation Ferritic Steel at 60C",
Y. Murase, J. Nagakawa and N. Yamamoto,
ASTM STP, (2001), submitted.

"Fatigue Response of F82H Steel under 17 MeV Proton Irradiation at 60C",
Y. Murase, J. Nagakawa and N. Yamamoto,
Proc. 6th Japan-China Symp. on Materials for Advanced Energy Systems and Fission and Fusion Engineering, (2001), in print.

"Dynamic Irradiation Effect on the Fatigue Cracking of 316 Stainless Steel",
Y. Murase, J. Nagakawa and N. Yamamoto,
Proc. 6th Japan-China Symp. on Materials for Advanced Energy Systems and Fission and Fusion Engineering, (2001), in print.

"Development of In-Beam Creep-Fatigue Machine",
J. Nagakawa, Y. Murase and N. Yamamoto,
Proc. IEA/JUPITER Joint Symposium on Small Specimen Technologies for Fusion Research, (2001), in print.

"Creep Pupture Properties of Ti- and P-Modified Fe-25Ni-15Cr Alloys Preinjected with He",
N. Yamamoto, J. Nagakawa, Y. Murase and H. Shiraishi,
Proc. IEA/JUPITER Joint Symposium on Small Specimen Technologies for Fusion Research, (1998), in print.

"Creep Behavior of 8Cr2WVTa Martensitic Steel Designed for Fusion DEMO Rewactor -An Assessment on Helium Embrittlement Resistance-",
N. Yamamoto, J. Nagakawa and K. Shiba,
Int'l J. JSME, 49 (2001), in print.

"Fatigue Properties of Metals under High-Energy Perticle Bombardment",
J. Nagakawa,
J. Welding Society of Japan, 70 (2001), 8-12 (in Japanese).

2000
"Irradiation Creep at 60 ℃and its Impact on Fatigue Fracture",
J. Nagakawa, Y. Murase, N. Yamamoto and T. Fukuzawa,
J. Nuclear Materials, 283-287 (2000), 391-395.

"Theoretical and Experimental Studies on the Significant Creep Deformation of SUS 316 Induced by Irradiation at 60℃",
J. Nagakawa, Y. Murase, N. Yamamoto and Y. Fukuzawa,
Key Engineering Material, 171-174 (2000), 313-320.

"Creep-Fatigue Response of 20%CW 316SS under Irradiation at 60℃",
Y. Murase, J. Nagakawa, N. Yamamoto and Y. Fukuzawa,
Effect of Radiation on Materials, ASTM STP 1366, ASTM, (2000), pp.713-724.

"Creep Rupture Properties of Helium Implanted Low Activation Martensitic Steel for Nuclear Fusion Application",
N. Yamamoto, J. Nagakawa, K. Shiba,
Key Engrg. Mater., 171-174 (2000), 115.

"Effects of Helium Implantation on Creep Rupture Properties of Low Activation Ferritic Steel F82H IEA Heat",
N. Yamamoto, J. Nagakawa, K. Shiba,
J. Nucl. Mater., 283-287 (2000), 400-403.

1999
"Computational Approach to the Fusion Reactor Materials: Radiation Radiation Damage in Fusion Reactor Materilas",
J. Nagakawa,
Computational Materials Design, Ed. T. Saito, Springer, (1999), pp.164-193.

"An Evaluation on Helium Embrittlement Resistance of Low Activation Ferritic/Martensitic Steel F82H",
N. Yamamoto, J. Nagakawa, K. Shiba,
J. Nucl. Sci. Technol., 36 (1999), 713-715.

"On the deformation and fracture of materials under irradiation",
J. Nagakawa et al.,
NRIM Research Report, 21 (1999), 153-171. (in Japanese)

1998
"Effect of Cold-Work on Void Swelling in Proton Irradiated Fe-15Cr-20Ni Ternary Alloys",
Y. Murase, J. Nagakawa, N. Yamamoto and H. Shiraishi,
J. Nuclear Materials, 258-263 (1998),1639-1643.

"Void Swelling in Fe-15Cr-xNi Ternary Alloys under Proton Irradiation",
Y. Murase, J. Nagakawa, N. Yamamoto and H. Shiraishi,
J. Nuclear Materials, 255 (1998), 34-43.

"Calculation of Radiation-Induced Deformation in the ITER Vacuum Vessel",
J. Nagakawa,
J. Nuclear Materials, 258-263 (1998), 289-294.

"Effect of Combined Addition of Ti and P on Creep Rupture Properties of Fe-25%Ni-15% Cr Alloy",
N. Yamamoto, J. Nagakawa, Y. Murase and H. Shiraishi,
J. Nucl. Mater., 258-263 (1998), 1634-1638.

"Microstructural Observation on Helium Implanted and Creep Ruptured Fe-25%Ni-15%Cr Alloys containing various MC and MN formers ",
N. Yamamoto, J. Nagakawa, Y. Murase and H. Shiraishi,
J. Nucl. Mater., 258-263 (1998), 1628-1633.

"Helium Embrittlement of Ti and P Added Austenitic Alloys Crept at 923K",
N. Yamamoto, J. Nagakawa, Y. Murase and H. Shiraishi,
Fusion Engineering and Design, 41 (1998), 111-117.

1997
"Radiation Induced Deformation of Materials",
J. Nagakawa,
Atomic Energy Industry, 43 (1997), 46-51. (in Japanese)

"Void Swelling in Proton Irradiated Fe-Cr-Ni Ternary Alloys",
Y. Murase, J. Nagakawa, N. Yamamoto and H. Shiraishi,
Fusion Technology, 1996 (1997), 503-506.

1996
"Bubble Microstructure and its Correlation to Creep Rupture Properties in Austenitic Alloys Implanted with Helium",
N. Yamamoto, J. Nagakawa, Y. Murase and H. Shiraishi,
Proc. 4th Japan-China Symp. on Materials for Advanced Energy Systems and Fision and Fusion Engineering, (1996), pp.161-166.

"Microstructural Evolution in Fe-Cr-Ni Ternary Alloys under Proton Irradiation",
Y. Murase, J. Nagakawa, N. Yamamoto and H. Shiraishi,
Proc. 4th Japan-China Symp. on Materials for Advanced Energy Systems and Fision and Fusion Engineering, (1996), pp.195-200.

"Void Swelling of Proton Irradiated Fe-20Ni-15Cr Ternary Alloy",
Y. Murase, A. Hasegawa, N. Yamaamoto, J. Nagakawa and H. Shiraishi,
J. of Nuclear Science and Technology, 33 (1996), 239-244.

1995
"Calcualtion of Radiation Induced Deforamtion in the LWR",
J. Nagakawa, N. Yamamoto and Y. Murase,
Proc. 2nd Japan-China Symp. on Materials for Advanced Energy Systems and Fusion Engineering, (1995), pp.347-351.

"The Effect of MC and MN Stabilizer Additions on the Creep Rupture Properties of He- Implanted Fe-25Ni-15Cr Austenitic Alloys",
N. Yamamoto, J. Nagakawa and H. Shiraishi,
J. of Nuclear Materials, 226 (1995), 185-196.

"Calculation of Radiation-Induced Creep and Stress-Relaxation",
J. Nagakawa,
J. of Nuclear Materials, 225 (1995), 1-7.

1994
"Discussion on the Materials Research for Nuclear Reactors",
M. Okada, J. Nagakawa et al.,
J. Atomic Energy Society of Japan, 36 (1994), 1021-1030. (in Japanese)

"Present Status of Radiation Embrittlement Mechanism of Pressure Vessel Steels Based on the Irradiation Correlation",
S. Ishino, J. Nagkawa et al.,
J. Atomic Energy Society of Japan, 36 (1994), 396-404. (in Japanese)

"Calculation of Radiation-Induced Stress Relaxation",
J. Nagakawa,
J. of Nuclear Materials, 212-215 (1994) 541-545.

1993年
"Cyclotron Materials Irradiation Experiments",
J. Nagakawa,
Isotope News, 472 (1993), 63-65. (in Japanese)

1992
"Calculational Evaluation of Radiation Induced Deformation",
J. Nagakawa,
Proc. 4th Int'l Symp. on Advanced Nuclear Research, (1992), pp.387-392.

"In Situ Deformation and Unfaulting of Interstitial Loops in Proton Irradiated Steels",
M. Suzuki, A. Sato, T. Mori, J. Nagakawa and N. Yamamoto,
PHilosophical Magazine A, 65 (1992), 1309-1326.

1991
"Computer Simulation of Early-Stage Irradiation Creep",
J. Nagakawa, N. Yamamoto and H. Shiraishi,
J. Nucl. Mater., 179-181 (1991), 986-989.

"Creep Rupture Properties of Helium Implanted g" Precippitation Strengthened Alloys",
N. Yamamoto, J. Nagakawa, H. Shiraishi and T. Shikata,
J. Nucl. Sci. Technol., 26 (1991), 1001-1013.

"In Situ Deforamtion of Proton Irradiated Molybdenum in a High-Voltage Electron Microscope",
M. Suzuki, A. Fujimura, A. Sato and J. Nagakawa,
Philosophical Magazine A, 64 (1991), 395-411.

"In Situ Deformation of Proton Irradiated Metals",
M. Suzuki, A. Fujimura, A. Sato and J. Nagakawa,
Ultramicroscopy, 39 (1991), 92-99.

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Paper Gliders

far: vertically ascending, rubber-catapult lauching type
near: hand-launching type for competition

Science Expo Park, Tsukuba

Can you see the vertically ascending glider, launched with a rubber catapult?

painted by the late Prof. S. Karashima