HIROSAWA Shoichi

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Professor

Date of Birth

1969

Research Fields, Keywords

Structural Materials Design, Microstructural Control and Analysis, Computational Materials Science

Mail Address

E-mail address

Related SDGs




写真a

The Best Research Achievement in the last 5 years 【 display / non-display

Graduating School 【 display / non-display

  •  
    -
    1993

    Tokyo Institute of Technology   Faculty of Engineering   Department of Metallurgical Engineering   Graduated

Graduate School 【 display / non-display

  •  
    -
    1998

    Tokyo Institute of Technology  Graduate School, Division of Science and Engineering  Department of Metallurgical Engineering  Doctor Course  Completed

  •  
    -
    1995

    Tokyo Institute of Technology  Graduate School, Division of Science and Engineering  Department of Metallurgical Engineering  Master Course  Completed

Degree 【 display / non-display

  • Doctor of Engineering -  Tokyo Institute of Technology

Campus Career 【 display / non-display

  • 2017.04
    -
    Now

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Professor  

  • 2014.04
    -
    2017.03

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Materials Science and Chemical Engineering   Professor  

  • 2007.04
    -
    2014.03

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Materials Science and Chemical Engineering   Associate Professor  

  • 2018.04
    -
    Now

    Concurrently   Yokohama National UniversityGraduate school of Engineering Science   Department of Mechanical Engineering, Materials Science and Ocean Engineering   Professor  

  • 2017.04
    -
    Now

    Concurrently   Yokohama National UniversityCollege of Engineering Science   Department of Mechanical Engineering, Materials Science and Ocean Engineering   Professor  

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External Career 【 display / non-display

  • 2002.01
    -
    2007.03

    Assistant Professor of Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology   Research Assistant  

  • 1999.04
    -
    2001.12

    University of Oxford   Research Associate of Department of Materials  

  • 1998.04
    -
    1999.02

    Technology and Medicine   Department of Materials, Imperial College of Science   Visiting Researcher  

  • 1997.04
    -
    1999.03

    Japan Society for the Promotion of Science   Research Fellowship for Young Scientists of the Japan Society for the Promotion of Science  

Academic Society Affiliations 【 display / non-display

  • 2007
     
     
     

    Japan Society for Heat Treatment

  • 1997
     
     
     

    Japan Institute of Metals

  • 1993
     
     
     

    Japan Institute of Light Metals

Field of expertise (Grants-in-aid for Scientific Research classification) 【 display / non-display

  • Structural/Functional materials

  • Physical properties of metals/Metal-base materials

  • Material processing/Microstructural control engineering

 

Research Career 【 display / non-display

  • Development of age-hardening technology for ultrafine-grained aluminum alloys processed by severe plastic deformation

    Project Year:  -   

  • Development of new fabrication process of Al-Mg-Si alloy sheets for body-panels of automobiles

    Project Year:  -   

  • Development of novel heat-resistant aluminum alloys

    Project Year:  -   

Books 【 display / non-display

  • Advanced Materials in Aerospace Engineering "Three strategies to achieve concurrent strengthening by ultrafine-grained and precipitation hardenings for severly deformed age-hardenable aluminum alloys"

    山根健ほか計34名 (Part: Contributor )

    Trans Tech Publications Inc.  2016.01

Thesis for a degree 【 display / non-display

  • Microstructure Evolution and Role of Microalloying Elements in Phase Decomposition of Al-Li-Cu Base Alloys

    廣澤 渉一 

    Doctral thesis of Tokyo Institute of Technology    1998.03

    Doctoral Thesis   Single Work

     View Summary

    東京工業大学理工学研究科金属工学専攻 種々のマイクロアロイング元素を含むAl-Li-Cu合金の析出組織形成を、TEM観察や電気比抵抗測定、熱分析およびモンテカルロシミュレーションを用いて明らかにし、原子間の相互作用エネルギーの大小で相分解挙動を分類・予測することで、より効率的な合金設計を可能とした

Papers 【 display / non-display

  • Continuous high-pressure torsion of pure Al and Al-2 wt% Fe alloy using multi-wires

    Masuda Takahiro, Hirosawa Shoichi, Horita Zenji

    JOURNAL OF MATERIALS SCIENCE ( Springer Science+Buisiness Media )  56 ( 14 )   8679 - 8688   2021.02  [Refereed]

    Joint Work

    Web of Science DOI

  • Microstructure evolution and mechanical properties of Al-Cu-Li alloys with different rolling schedules and subsequent artificial ageing heat treatment

    Liu Dan-yang, Li Jin-feng, Liu Tian-le, Ma Yun-long, Iwaoka Hideaki, Hirosawa Shoichi, Zhang Kai, Z … Show more authors

    Materials Characterization ( Elsevier )  170   110676-1 - 110676-11   2020.12  [Refereed]

    Joint Work

    Web of Science DOI

  • Considerable improvement in elastic moduli and the underlying mechanism of Al-Cu-Zn alloy subjected to aging treatments

    Kasama Ryota, Iwaoka Hideaki, Umeda Yuto, Tang Yongpeng, Hirosawa Shoichi, Watanabe Hiroyuki, Fujit … Show more authors

    Materialia ( Elsevier )  14   100911-1 - 100911-8   2020.12  [Refereed]

    Joint Work

    Web of Science DOI

  • Precipitate microstructures, mechanical properties and corrosion resistance of Al-1.0 wt%Cu-2.5 wt%Li alloys with different micro-alloyed elements addition

    D. Liu, Y. Ma, J. Li, R. Zhang, H. Iwaoka and S. Hirosawa

    Materials characterization ( Elsevier )  167   110528   2020.07  [Refereed]

    Joint Work

     View Summary

    The evolution of precipitate microstructures of the Al-1.0wt%Cu-2.5wt%Li alloys with different micro-alloyed elements addition was investigated during ageing at 175 °C together with the mechanical properties and corrosion resistance. It was found that the Al-Cu-Li alloy with Zn addition possesses not only higher yield strength but also improved intergranular corrosion resistance, compared with the alloy with Mg addition. The corresponding precipitate microstructures were greatly affected by Zn or Mg micro-alloyed element addition, for example, with Zn addition the δ′-Al3Li, T1-Al2CuLi and θ′-Al2Cu (and θ″) phases were formed within grains, whereas the coarse TB-Al7Cu4Li phase and the T1 phases appeared at grain boundaries (GBs). In contrast, the Al-Cu-Li alloy with Mg addition possessed the δ′, T1 and S′-Al2CuMg phases within grains, while the coarse Alsingle bondCu phase and T1 phases were present at GBs. The alloy with combined Zn + Mg addition exhibited a duplex microstructure of the two alloys, resulting in lower mechanical strengths but the intermediate corrosion resistance. Therefore, the increased amount of Zn-containing coarsened TB phase at GBs was found to improve the corrosion resistance of the alloy with Zn addition, due to the smaller potential difference between the GB precipitates and the adjacent zones.

    DOI

  • Achieving highly strengthened Al–Cu–Mg alloy by grain refinement and grain boundary segregation

    T. Masuda, X. Sauvage, S. Hirosawa and Z. Horita

    Materials Science and Engineering A ( Elsevier )  793   139668   2020.07  [Refereed]

    Joint Work

     View Summary

    An age-hardenable Al–Cu–Mg alloy (A2024) was processed by high-pressure torsion (HPT) for producing an ultrafine-grained structure. The alloy was further aged for extra strengthening. The tensile strength then reached a value as high as ~1 GPa. The microstructures were analyzed by transmission electron microscopy and atom probe tomography. The mechanism for the high strength was clarified in terms of solid-solution hardening, cluster hardening, work hardening, dispersion hardening and grain boundary hardening. It is shown that the segregation of solute atoms at grain boundaries including subgrain boundaries plays a significant role for the enhancement of the tensile strength.

    DOI

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Review Papers 【 display / non-display

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Academic Awards Received 【 display / non-display

  • Light Metals Paper Prize

    2010.11.13    

  • Light Metals Paper Prize

    2007.11    

  • Young Scientist Award of Japan Institute of Light Metals

    2003.11    

  • Japan Institute of Metals Young Scientist Medal

    2002.09    

  • Light Metals Paper Prize

    1996.11    

Grant-in-Aid for Scientific Research 【 display / non-display

  • Elucidation of nano-precipitate strengthening mechanism in aluminum alloys by in-situ tensile-testing TEM observation and dislocation dynamics

    Grant-in-Aid for Scientific Research(B)

    Project Year: 2021.04  -  2024.03  Investigator(s): Shoichi HIROSAWA

  • Grant-in-Aid for Scientific Research(C)

    Project Year: 2010.04  -  2013.03 

Other external funds procured 【 display / non-display

  • Development of novel wrought aluminum alloys concurrently strengthened by ultrafine-grained and precipitation hardenings and establishment of guidelines for the innovative alloy designing

    Offer organization: Japan Science and Technology Agency  Collaborative Research Based on Industrial Demand "Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials"

    Project Year: 2011.10  -  2017.03  Investigator(s): Shoichi HIROSAWA

Presentations 【 display / non-display

  • Concurrent strengthening of ultrafine-grained age-hardenable Al-Mg alloy by means of high-pressure torsion and spinodal decomposition

     [Invited]

    2017.07.11  

  • Three strategies to achieve concurrent strengthening by ultrafine-grained and precipitation hardenings for severely deformed age-hardenable aluminum alloys

    S.Hirosawa, Y.Tang, Z.Horita, S.Lee, K.Matsuda, D. Terada  [Invited]

    9th Pacific Rim Inte. Conf. on Advanced Materials and Processing (PRICM9) (Three strategies to achieve concurrent strengthening by ultrafine-grained and precipitation hardenings for severely deformed age-hardenable aluminum alloys)  2016.08.04   9th Pacific Rim Inte. Conf. on Advanced Materials and Processing (PRICM9)

  • Comparative and complementary characterization of precipitate microstructures in Al-Mg-Si(-Li) alloys by TEM, EDS and APT

    S.Hirosawa, Y.Koshino, M.Kozuka, Y.Aruga

    15th Inter. Conf. on Aluminum Alloys (ICAA15) (Comparative and complementary characterization of precipitate microstructures in Al-Mg-Si(-Li) alloys by TEM, EDS and APT)  2016.06.13   15th Inter. Conf. on Aluminum Alloys (ICAA15)

  • Comparative and complementary characterization of precipitate microstructures in Al-Mg-Si(-Li) alloys

    2016.03.01  

  • Three strategies to achieve concurrent strengthening by ultrafine-grained and precipitation hardenings for severely deformed age-hardenable aluminum alloys

    S. Hirosawa, Y. Tang, Z. Horita, S. Lee, K. Matsuda, D. Terada

    International Workshop of Giant Straining Process for Advanced Materials 2015 (GSAM2015)(Three strategies to achieve concurrent strengthening by ultrafine-grained and precipitation hardenings for severely deformed age-hardenable aluminum alloys)  (Fukuoka)  2015.09.05  

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Past of Collaboration and Commissioned Research 【 display / non-display

  • Japan Science and Technology Agency (JST) under Collaborative Research Based on Industrial Demand "Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials"

    Cooperative Research within Japan  

    Project Year: 2011.10  -  2017.03 

  • Development of age-hardening technology for ultrafine-grained aluminum alloys processed by giant straining

    Cooperative Research within Japan  

    Project Year: 2009.04  -  2011.03 

  • Studies on creep behavior of aluminum alloys

    Cooperative Research within Japan  

    Project Year: 2007.04  -  2010.03