KEIO RESEARCHERS INFORMATION SYSTEM

Profile Summary 【 Display / hide 】

Profile Summary 【 Display / hide 】

• To create new products with high added value, we are conducting R&D on high-accuracy, high-efficiency, resource-saving manufacturing technologies through micro/nanometer-scale material removal, deformation, and property control. Our recent research focuses on ultra-precision mechanical fabrication, micro-nano forming/imprinting, micro electrical machining, laser machining, laser recovery, and laser Raman spectroscopy.

Career 【 Display / hide 】

Career 【 Display / hide 】

• 2000.04

  -

  2001.09

  Research Associate, Tohoku University, Graduate School of Engineering

• 2001.10

  -

  2005.03

  Associate Professor, Kitami Institute of Technology

• 2005.04

  -

  2007.03

  Associate Professor, Tohoku University, Graduate School of Engineering

• 2007.04

  -

  2012.03

  Associate Professor, Tohoku University, Graduate School of Engineering

• 2008.02

  -

  2008.04

  Sydney University, Japan-Australia Exchange Researcher

display all >>

Academic Background 【 Display / hide 】

Academic Background 【 Display / hide 】

• 1991.07

  Jilin University, Faculty of Engineering, Department of Mechanical Engineering

  University, Graduated

• 1994.03

  Jilin University, Graduate School, Division of Engineering, Department of Mechanical Engineering

  Graduate School, Completed, Master's course

• 1996.01

  Tsinghua University, Graduate School, Division of Engineering, Department of Precision Instruments and Mechanology

  Graduate School, Withdrawal before completion, Doctoral course

• 2000.03

  Tohoku University, Graduate School, Division of Engineering, Department of Mechatronics and Precision Engineering

  Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

• Ph.D., Tohoku University, Coursework, 2000.03

Research Areas 【 Display / hide 】

Research Areas 【 Display / hide 】

• Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering (Precision Engineering/Mechanical manufacturing)

• Nanotechnology/Materials / Material processing and microstructure control (Material Processing/Treatment)

• Nanotechnology/Materials / Nano/micro-systems (Micro/Nanodevice)

• Nanotechnology/Materials / Composite materials and interfaces (Applied Physical Properties/Crystal Engineering)

Research Keywords 【 Display / hide 】

Research Keywords 【 Display / hide 】

• Ultraprecision machining

• Micro/nano manufacturing

• Laser processing

• Electrical discharge machining

• Nanomechanics

Books 【 Display / hide 】

Books 【 Display / hide 】

• Advanced Ceramic Coatings: Fundamentals, Manufacturing, and Classification, R. K. Gupta, A. Motallebzadeh, S. Kakooei, T. A. Nguyen, A. Behera (eds.)

  P. J. Liew, J. Yan, C. Y. Yap, Elsevier B. V., 2023.06

  Scope: Chapter 19: Electrical discharge coating with quarry dust powder suspension,  Contact page： 433-460

• Multidisciplinary Science in Micro/Nanoscale Manufacturing

  J. Yan (Guest editor), Elsevier B.V., 2020.12

  Scope: International Journal of Machine Tools and Manufacture, Volume 159 (Special Issue)

• Micro and Nanoscale Laser Processing of Hard Brittle Materials

  J. Yan and N. Takayama, Elsevier B.V., 2019.11,  Page： 242

  Scope: 1-242

• Recent Developments of Silicon Anodes for Lithium Ion Batteries

  J. Yan, CMC Publishing CO., LTD. , 2019.11,  Page： 251

  Scope: Chapter 3: Micro Pillar Generation by Laser Irradiation on Waste Silicon Powder and Its Electrode Characteristics, 20-33

• Micro and Nano Fabrication Technology

  J. Yan (ed.), Springer Nature Singapore Pte Ltd., 2018.05

  Scope: 1-959

display all >>

Papers 【 Display / hide 】

Papers 【 Display / hide 】

• Fabrication of microcone arrays on Ti6Al4V by nanosecond laser nitriding

  Zhang H., Wang B., Yang Z., Zhang H., Zhang Z., Huang H., Yan J.

  International Journal of Mechanical Sciences 287 2025.02

  ISSN  00207403

  　View Summary

  The application of titanium alloys still faces some challenges such as relatively low hardness and insufficient wear resistance. Nanosecond pulsed laser irradiation in a nitrogen atmosphere has proven to be effective for fabricating micro/nano structures on titanium alloys, enhancing surface hardness and wear resistance. However, micro/nano structures produced by line-by-line laser scanning often exhibit directional differences and surface defects such as re-deposited particles and pores. Herein, vertically crossed laser scanning in a nitrogen atmosphere was employed to address the directional difference, enabling the simultaneous fabrication of microcone arrays and nitriding layers on Ti6Al4V surface. To eliminate the surface defects on the microcone structure, laser surface finishing via defocused scanning was performed, followed by morphological analysis, bonding force evaluation, and tribological performance testing. The results showed that the area percentage of re-deposited particles on the laser-finished microcone array surface decreased from 24 % to 5 %. The bonding force of the nitriding layer was assessed using linear loading scratch tests, and the highest value of 69 N was obtained. To investigate the wear resistance of the laser-finished microcone array surface, friction and wear tests were performed. From 25 °C to 600 °C, nearly no wear grooves were observed on the tested surfaces, demonstrating excellent high-temperature wear resistance. The wear mechanism was mainly related to the cutting action of the microcone structures on the counterpart ball. This study advances the fabrication of micro/nano structures and simultaneous nitriding on titanium alloys, demonstrating the significant potential for practical applications as surface contact materials.

  • Access to Document (DOI)

• Nanoindentation behavior of the laser-repaired CoCrFeNiV high-entropy alloy

  Wang C., Huang W., Yi C., Jiang M., Huang H., Yan J.

  Intermetallics 177 2025.02

  ISSN  09669795

  　View Summary

  High-entropy alloys (HEAs) are solid-solution alloys composed of multiple elements, exhibiting excellent mechanical properties. The unique plastic deformation mechanism induced by their specific solid solution structures has attracted considerable attention but remains incompletely understood, particularly at the micro-scale. In this study, the surface morphology, chemical composition, and microstructures of CoCrFeNiV HEA before and after laser remelting repair were investigated. Nanoindentation testing was employed to characterize the surface hardness and creep behavior of the repaired surface. The distribution of surface hardness before and after laser remelting, as well as the indentation creep behavior under different loads, were studied. The mechanism of indentation creep on the repaired surface was discussed and analyzed. The effect of microstructures of HEAs, including precipitated phases and sub-grain boundaries, on dislocation-dominated micro-scale plastic deformation was elucidated by the transmission electron microscope (TEM). This study contributes to an in-depth understanding of the creep behavior and micro-scale deformation mechanisms in HEAs.

  • Access to Document (DOI)

• Femtosecond Pulsed Laser Machining of Fused Silica for Micro-Cavities With Sharp Corners

  Brinkmann, M; Qian, YF; Huang, H; Yan, JW

  JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME 147 ( 1 )  2025.01

  ISSN  1087-1357

  • Access to Document (DOI)

• Special Issue: The State-of-the-Art in Japanese Manufacturing Research

  Kakinuma, Y; Matsubara, A; Matsumura, T; Sugita, N; Suzuki, N; Takahashi, S; Yan, JW

  JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME 147 ( 1 )  2025.01

  ISSN  1087-1357

  • Access to Document (DOI)

• Subsurface amorphization-induced ultrasmooth and ultrahard surface during the diamond turning of polycrystalline pure copper

  Wang S., He C., Wang Z., Yan J.

  Materials and Design 249 2025.01

  ISSN  02641275

  　View Summary

  Previous simulations indicated that pure metals can be amorphized during diamond turning. However, no pure metal has been successfully amorphized during this procedure to date. Herein, a comprehensive study on the surface formation mechanism was performed by examining the surface finish and subsurface variation characteristics. Polycrystalline pure copper was selected as the working material. In this study, the amorphization phenomenon and lattice structure transformations (from face-centred cubic to hexagonal close-packed and monoclinic structures) of pure copper were observed. The amorphization and phase transformation inside the working material depended on the tool nose radius being large, the cutting edge being sharp, and the feed rate being low. By using a large-nose-radius (10 mm) diamond tool with a sharp cutting edge (10.3 nm) at a low feed rate (0.5 μm/rev), an ultrasmooth and ultrahard surface with a 0.61 nm roughness Sa and 5.0 GPa nanohardness was achieved. Molecular dynamics simulations revealed that the high shear strain was responsible for the amorphization and lattice structure transformation during pure copper diamond turning. The findings of this study were considered critical for generating an amorphous subsurface layer in a pure metal and for achieving a ultrasmooth and ultrahard surface using single-point diamond turning.

  • Access to Document (DOI)

display all >>

Papers, etc., Registered in KOARA 【 Display / hide 】

Papers, etc., Registered in KOARA 【 Display / hide 】

• Laser generation of Si@C core-shell nanowires and its application to the fabrication of next-generation Li-ion battery

  Yan, Jiwang

  科学研究費補助金研究成果報告書 2022

Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• Laser-based micro/nano machining technologies for high-value added manufacturing

  J. Yan

  Machines and Tools 14 ( 11 ) 8 - 15 2024.11

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author

• Creating functional surfaces by micro/nano scale laser machining

  J. Yan

  Laser (Journal of the Japan Society of Laser Technology) 49 ( 1 ) 20 - 25 2024.11

  Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work

• Laser polishing technologies for additive-manufactured metal products

  J. Yan

  Journal of the Japan Society for Abrasive Technology 67 ( 8 ) 440 - 443 2023.08

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author

• Ultraprecision ductile mode machining of hard brittle materials

  J. Yan

  Journal of the Japan Society of Mechanical Engineers 125 ( 1247 ) 11 - 14 2022.10

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author

• Ultrasonic vibration-assisted grinding of carbon-based difficult-to-cut materials

  J. Yan

  Journal of the Japan Society for Precision Engineering 88 ( 7 ) 541 - 545 2022.07

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Corresponding author

display all >>

Presentations 【 Display / hide 】

Presentations 【 Display / hide 】

• Scale-bridging surface structuring for functional performance improvement of components

  J. Yan

  7th CIRP CSI Conference on Surface Integrity 2024 (ブレーメン) , 

  2024.05

  , 

  Oral presentation (keynote)

• Tool Dynamics-induced Surface Topography Error in Fast Tool Servo-Based Diamond Turning of Micro Dome Arrays

  T. Hashimoto, J. Yan

  7th CIRP CSI Conference on Surface Integrity 2024 (Bremen) , 

  2024.05

  , 

  Oral presentation (general)

• Influences of tool tip geometry on surface/subsurface damage formation in nanoscratching of single-crystal 4H-SiC

  W. Huang, J. Yan

  7th CIRP CSI Conference on Surface Integrity 2024 (Bremen) , 

  2024.05

  , 

  Oral presentation (general)

• Ultraprecision manufacturing for small optics

  J. Yan

  Nanotechnology and Precision Engineering (NPE) International Series Forum (Online) , 

  2024.04

  , 

  Oral presentation (invited, special)

• 自由曲面加工における工具姿勢に起因する切削メカニズム変化

  川上凜太朗，閻 紀旺

  精密工学会第31回学生会員卒業研究発表講演会 (東京) , 

  2024.03

  , 

  Oral presentation (general)

display all >>

Awards 【 Display / hide 】

Awards 【 Display / hide 】

• JSME Medal for Outstanding Paper

  L. Zhang, Y. Sato, J. Yan, 2024.04, The Japan Society of Mechanical Engineers, Optimization of fast tool servo diamond turning for enhancing geometrical accuracy and surface quality of freeform optics

  Type of Award： Award from Japanese society, conference, symposium, etc.

• IJEM Best Editor Award

  J. Yan, 2024.01, International Journal of Extreme Manufacturing (IJEM), IoP publishing

  Type of Award： Honored in official journal of a scientific society, scientific journal

• JSPE Best Paper Award

  Lin Zhang, Allen Yi, J. Yan, 2023.03, The Japan Society for Precision Engineering, Flexible fabrication of Fresnel micro-lens array by off-spindle-axis diamond turning and precision glass molding

  Type of Award： Award from Japanese society, conference, symposium, etc.

• 2022 IJEM Best Paper Award

  Y. Sato, J. Yan, 2023.03, International Journal of Extreme Manufacturing (IJEM), IoP publishing, Tool path generation and optimization for freeform surface diamond turning based on an independently controlled fast tool servo

  Type of Award： Honored in official journal of a scientific society, scientific journal

• Machine Tool Technology Promotion Award

  S. Kasai, T. Sodetai, J. Yan, 2021.06, 工作機械技術振興財団, 炭素拡散反応を用いた形彫り放電加工による多結晶ダイヤモンドの３次元形状創製

  Type of Award： Award from publisher, newspaper, foundation, etc.

display all >>

Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• ULTRAPRECISION MACHINING AND METROLOGY

  2024

• SPECIAL LECTURE SERIES ON MULTIDISCIPLINARY AND DESIGN SCIENCE

  2024

• LABORATORIES IN SCIENCE AND TECHNOLOGY

  2024

• INDEPENDENT STUDY ON INTEGRATED DESIGN ENGINEERING

  2024

• INDEPENDENT STUDIES IN MECHANICAL ENGINEERING

  2024

display all >>

Memberships in Academic Societies 【 Display / hide 】

Memberships in Academic Societies 【 Display / hide 】

• The Japan Society of Mechanical Engineers, 

  1997.04

  -

  Present

• The Japan Society for Precision Engineering, 

  1997.04

  -

  Present

• The Japan Society for Abrasive Technology, 

  2000.04

  -

  Present

• Japan Society for Applied Physics (JSAP), 

  2004.04

  -

  Present

• Japan Laser Processing Society (JLPS), 

  2009.01

  -

  Present

display all >>

Committee Experiences 【 Display / hide 】

Committee Experiences 【 Display / hide 】

• 2024.01

  -

  Present

  Associate Editor, Journal of Materials Processing Technology

• 2022.05

  -

  Present

  Director, Japan Society of Laser Technology (JSLT)

• 2022.03

  -

  Present

  Director, Executive Director, Chairman of Publication Sector, Chairman of Journal Review Board, Japan Society of Precision Engineering (JSPE)

• 2019.04

  -

  2022.03

  Journal Editorial Commitee Member, 日本機械学会

• 2019.01

  -

  Present

  Editorial Board Member, International Journal of Extreme Manufacturing

display all >>