Yan, Jiwang



Faculty of Science and Technology, Department of Mechanical Engineering (Yagami)



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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

  • 2000.04

    Research Associate, Tohoku University, Graduate School of Engineering

  • 2001.10

    Associate Professor, Kitami Institute of Technology

  • 2005.04

    Associate Professor, Tohoku University, Graduate School of Engineering

  • 2007.04

    Associate Professor, Tohoku University, Graduate School of Engineering

  • 2008.02

    Sydney University, Japan-Australia Exchange Researcher

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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

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


Research Areas 【 Display / hide

  • Production engineering/Processing studies (Precision Engineering/Mechanical manufacturing)

  • Material processing/Microstructural control engineering (Material Processing/Treatment)

  • Nano/Microsystems (Micro/Nanodevice)

  • Composite materials/Surface and interface engineering (Applied Physical Properties/Crystal Engineering)

Research Keywords 【 Display / hide

  • Ultraprecision machining

  • Micro/nano manufacturing

  • Laser processing

  • Electrical discharge machining

  • Nanomechanics


Books 【 Display / hide

  • 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

     View Summary

    © Elsevier 2020. All rights reserved. Micro and Nanoscale Laser Processing of Hard Brittle Materials examines general laser-material interactions within this type of material, focusing on the nanoprocessing technologies that these phenomena have given rise to. Sections cover laser machining, healing, recovery, sintering, surface modification, texturing and microstructuring. These technologies all benefit from the characteristics of laser processing, its highly localized heating ability, and its well-defined optical properties. The book also describes frontier applications of the developed technologies, thus further emphasizing the possibility of processing hard brittle materials into complex structures with functional surfaces at both the micro and nanoscale.

  • 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

  • Micro and Nano Fabrication Technology, J. Yan (ed.)

    M. Mukaida, J. Yan, Springer Nature Singapore Pte Ltd., 2018.05

    Scope: Chapter 7: Tool-Servo Driven Diamond Turning for Structured Surface, 215-244

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Papers 【 Display / hide

  • Evolution and control of deformation mechanisms in micro-grooving of Zr-based metallic glass

    P Qiu, B Meng, S Xu, Y Rong, J Yan

    Journal of Manufacturing Processes 68, 923-931 (Journal of Manufacturing Processes)  68   923 - 931 2021.08

    ISSN  15266125

     View Summary

    The evolution of deformation mechanisms with increasing depth of cut (DOC) in micro-grooving of Zr-based metallic glass was deeply investigated in this study for the first time. The micro-grooving characteristics of metallic glass were initially studied by nanoscratch test, which verified that the material removal mode abruptly changes from extrusion mode to cutting mode with increase of DOC. Based on the free-volume theory, a dynamic model coupling stress, temperature and free volume concentration was used to simulate the change of deformation characteristics with DOC. The results showed that the deformation mechanism of metallic glass is closely related to free volume flow, which is significantly affected by average strain rate and free volume flow coefficient in deformation zone and can be tuned with different DOC. Considering that free volume flow is determined by its flow coefficient and concentration, we proposed to control the deformation characteristics of metallic glass in micro-grooving by heat treatment and verified its effectiveness experimentally.

  • On the transformation between micro-concave and micro-convex in nanosecond laser ablation of a Zr-based metallic glass

    Y Qian, M Jiang, Z Zhang, H Huang, J Yan

    Journal of Manufacturing Processes 68, 1114-1122 (Journal of Manufacturing Processes)  68   1114 - 1122 2021.08

    ISSN  15266125

     View Summary

    Understanding the physical mechanism of laser-material interaction is significant and meaningful in both pure science and engineering applications. Laser ablation induced micro-concave is a commonly-observed phenomenon, but the formation of micro-convex by laser ablation is rarely reported. In this study, the transformation in surface microstructure from micro-concave to micro-convex, then to micro-concave again was reported for the first time in laser ablation of a typical Zr-based metallic glass (MG). The experimental results indicated that such transformations strongly depended on the peak laser power intensity and number of laser pulses. The coupling effects of the recoil pressure and Marangoni flow were proposed to explain the observed transformation. By locally overlapping adjacent micro-convexes, various surface patterns could be fabricated on the MG surface, which could tune its surface wettability. This study would not only enhance the understanding of laser-MG interaction but also provide new methods for patterning MG surface.

  • Evolution of high-pressure metastable phase Si-XIII during silicon nanoindentation: A molecular dynamics study

    Zhang L., Yan J.

    Computational Materials Science (Computational Materials Science)  191 2021.04

    ISSN  09270256

     View Summary

    © 2021 Elsevier B.V. Berkovich indenters are widely employed in nanoindentation experiments of single-crystal silicon, in molecular dynamic simulations of silicon nanoindentation, however, spherical indenters are generally employed. To close this gap, in this paper, a series of molecular dynamic simulations are conducted on (0 0 1), (1 0 1), and (1 1 1) silicon surfaces to explore the evolution of high-pressure phases. Several possible silicon phases are tracked by coordination number (CN), radial distribution function (RDF), and angular distribution function (ADF). Results show that the metastable phases and the high-pressure phases present different symmetrical patterns along different crystallographic orientations. A large amount of high-pressure phase Si-XIII, which is seldomly observed in nanoindentation using a spherical indenter, is first discovered under the Berkovich indenter, and the evolution mechanism is characterized by tracking the position transition of labeled silicon atoms. As a transition phase for high-pressure phase Si-II and Si-XIII, bct5 phase is found in the {1 1 1} [1 1 0] slip systems, which is related with slipping flatten lattice structures. Different from the phase transformation criterion for Si-II, the transformation from Si-I to Si-XIII companies with the local elastic deformation of (0 0 1) surface. The atoms in the three neighboring unit cells are compressed into a uniform long-distance ordered crystal structure. Upon indenter extraction and rapid stress releasing, the elastic deformation of the crystal surface resumes incompletely. A part of Si-XIII recovers to pristine Si-I and the rest changes into amorphous phase. The distribution of local hydrostatic pressure and von Mises stress in the phase transformation regions indicates that the concentrated hydrostatic pressure and specific stress induce this high-pressure silicon phase. This research clarifies the evolutionary process of Si-XIII phase generation and enriches fundamental understanding on the mechanisms of silicon phase transformations in nanoindentation.

  • Annealed high-phosphorus electroless Ni–P coatings for producing molds for precision glass molding

    Yu Q., Zhou T., He Y., Liu P., Wang X., Jiang Y., Yan J.

    Materials Chemistry and Physics (Materials Chemistry and Physics)  262 2021.04

    ISSN  02540584

     View Summary

    © 2021 Elsevier B.V. An annealed high-phosphorus electroless Ni–P coating was developed as the mold material for precision glass molding. The coating with a phosphorus content of 11.6 wt% was prepared on heat-resistant stainless steel via an intermittent ultrasonic-assisted electroless plating method. The effects of annealing temperature and heating rate on phase transformation, grain size variation, and mechanical properties were investigated. An annealing temperature of 600 °C with a heating rate of 5 °C/min was determined to be the optimal choice for heat treatment. Microgrooves were machined on the coating surface. After heat treatment, the increased hardness and modulus helped the microgrooves on the coating resist thermal deformation during the PGM process. The PV value decreased from 0.58 to 0.32 μm, and the surface roughness decreased from Sa 104.5 to Sa 62.6 nm. The mold produced by heat-treated coating was beneficial for improving the forming accuracy of precision glass molding.

  • Deterministic error compensation for slow tool servo-driven diamond turning of freeform surface with nanometric form accuracy

    Nagayama K., Yan J.

    Journal of Manufacturing Processes (Journal of Manufacturing Processes)  64   45 - 57 2021.04

    ISSN  15266125

     View Summary

    © 2021 The Society of Manufacturing Engineers Slow tool servo (STS) turning takes an important role in fabrication of freeform optical elements. However, in conventional STS turning, it is technologically difficult to obtain nanometer-level form accuracy due to multiple error factors such as tool trajectory errors, tool alignment errors and dynamic follow-up errors of machine tools used. In this study, a deterministic process flow was proposed where all the main error factors were comprehensively analyzed, simulated and then compensated before machining based on the feedforward method, and the workpiece form error after compensation was predicted accurately. The proposed process flow enabled achieving nanometer-level form accuracy by a single cut without the necessity of repetitive trial-and-error. To demonstrate the effectiveness of the proposed method, cutting tests of a two-dimensional sine wave grid were attempted on single-crystal silicon and the proposed error compensation was applied. As a result, the form error was reduced to 8 nm P–V (peak to valley) with a surface roughness of 1 nm Sa by a single cut.

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Reviews, Commentaries, etc. 【 Display / hide

  • Effects of ultrasonic vibration on groove grinding of CFRP

    T. Yamazaki, J. Yan

    Ultrasonic Technology 32 ( 6 ) 1 - 6 2020.12

    Introduction and explanation (commerce magazine), Joint Work

  • Surface quality improvement of additive-manufactured metal parts by ultrasonic vibration-assisted burnishing

    A. Teramachi, J. Yan

    Ultrasonic Technology 32 ( 6 ) 7 - 11 2020.12

    Introduction and explanation (commerce magazine), Joint Work

  • Laser-Induced Periodic Surface Structure on Steel and Its Application to Mold Fabrication

    J. Yan

    Journal of the Japan Society for Abrasive Technology 64 ( 8 ) 399 - 402 2020.08

    Introduction and explanation (scientific journal), Single Work

  • Tool contour measurement technology for ultraprecision cutting of free-form microstructured surfaces

    K. Nagayama, J. Yan

    Machines and Tools 10 ( 3 ) 8 - 12 2020.03

    Introduction and explanation (scientific journal), Joint Work

  • Surface smoothing of additive manufactured alloy by multiple laser processes

    T. Urushibata, H. Ishida, Y. Sugiyama, T. Wakabayashi, Y. Takushima, J. Yan

    Journal of Japan Laser Processing Society 26 ( 2 ) 44 - 46 2019.06

    Introduction and explanation (scientific journal), Joint Work

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Presentations 【 Display / hide

  • 微細構造表面の超精密加工と機能付与

    閻 紀旺

    精密工学会第410回講習会「超精密 加工/計測技術 -光学部品の高精度要求に応える先端事例と最新動向」 (東京(オンライン開催)) , 2020.12, Oral Presentation(guest/special)

  • マイクロ加工技術の進展と研究動向

    閻 紀旺

    精密工学会マイクロ生産機械システム専門委員会2020年度総会兼第59回委員会 (東京(オンライン開催)) , 2020.12, Oral Presentation(guest/special)

  • Laser healing of machining-induced microcracks in single-crystal sapphire

    K. Adachi, Y. Nishide, N. Sugizaki, J. Yan

    The 18thInternational Conference on Precision Engineering (ICPE2020) (Kobe, Japan (Online)) , 2020.11, Oral Presentation(general)

  • Response of resin coating films containing fine metal particles to ultrashort laser pulses

    A. Nakajima, J. Yan

    The International Symposium on Precision Engineering and Sustainable Manufacturing (PRESM2020) (Seoul, Korea (Online)) , 2020.11, Poster (general)

  • Micro/nanoscale surface structuring for functionalization of materials

    J. Yan

    The International Symposium on Precision Engineering and Sustainable Manufacturing (PRESM2020) (Seoul, Korea (Online)) , 2020.11, Oral Presentation(guest/special)

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Awards 【 Display / hide

  • 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: Awards of Publisher, Newspaper Company and Foundation

  • Machine Tool Technology Promotion Award

    K. Nagayama, J. Yan, 2021.06, 工作機械技術振興財団, Measurement and Compensation of Tool Contour Error Using White Light Interferometry for Ultra-Precision Diamond Turning of Freeform Surfaces

    Type of Award: Awards of Publisher, Newspaper Company and Foundation

  • JSME Medal for Outstanding Paper

    T. Terabayashi, J. Yan, 2021.04, The Japan Society of Mechanical Engineers, Ultra-precision cutting of roll molds having two-directional wavy microstructures

    Type of Award: Awards of National Conference, Council and Symposium

  • PRESM2020 Best Paper Award

    A. Nakajima, J. Yan, 2020.10, International Symposium on Precision Engineering and Sustainable Manufacturing (PRESM2020), Response of Resin Coating Films Containing Fine Metal Particles to Ultrashort Laser Pulses

    Type of Award: Awards of International Conference, Council and Symposium.  Country: Korea

  • Outstanding Paper Award

    Z. Zhang, J. Yan, T. Kuriyagawa, 2020.09, International Journal of Extreme Manufacturing (IJEM), IoP publishing, Manufacturing technologies toward extreme precision

    Type of Award: Celebration by Official journal of a scientific society or Academic Journal

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Courses Taught 【 Display / hide











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Memberships in Academic Societies 【 Display / hide

  • The Japan Society of Mechanical Engineers, 

  • The Japan Society for Precision Engineering, 

  • The Japan Society for Abrasive Technology, 

  • Japan Society for Applied Physics (JSAP), 

  • Japan Laser Processing Society (JLPS), 


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Committee Experiences 【 Display / hide

  • 2019.04

    Journal Editorial Commitee Member, 日本機械学会

  • 2019.01

    Editorial Board Member, International Journal of Extreme Manufacturing

  • 2018.04

    Editorial Board Member, Journal of Micromanufacturing

  • 2018.03

    Editorial Board Member, International Journal of Machine Tools and Manufacture

  • 2017.06

    Editorial Board Member, Nanomanufacturing and Metrology

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