Personnel Information



Job Title



Materials Science and Engineering

Homepage URL

Laboratory Address

Nakamozu Campus

Faculty in charge, etc. 【 display / non-display

  • College of Engineering

  • Graduate School of Engineering

Research field 【 display / non-display

  • Physical properties of metals/Metal-base materials

  • Inorganic materials/Physical properties

  • Structural/Functional materials

  • Nanomaterials engineering

  • Crystal engineering

Research content 【 display / non-display

  • (Summary)Light elements dissolved in metallic materials play important roles in microstructure formation and mechanical properties. To establish scientific basis for the material design we study their solid solubility and diffusivity in such useful materials as titanium, iron, and other transition metals using various theoretical and experimental techniques.

    (Keyword)intersitital solute atoms, substitutional solute atoms, sold-solution alloys, diffusion, solute-defect interaction

  • (Summary)Alloying elements in steels often affect strongly the behaviour of carbon and nitrogen in solution through atomic interaction, thereby strongly influence the properties of the material. We study the interaction between various alloying elements with carbon and nitrogen in bcc iron, of which quantitative understanding is still lacking, by combining theoretical and experimental methods.

    (Keyword)metals and alloys, solute atoms, crystal defects, diffusion, iron and steel

  • (Summary)The diffusion behaviour of atoms in solids are important in microstructure formation and various properties of materials, but atomic diffusion in solids of compound crystals are not yet well understood, unlike pure metals and solid-solution alloys. We study atomic diffusion in novel materials of complex structures, first obtaining diffusion data by experiment, and then trying to clarify their mechanisms at the atomic level.

    (Keyword)Intermetallic compounds, Metal oxides, Point defects, Mobility

  • (Summary)Mechanical spectroscopy is a method for quantitatively analysing the microstructure of materials, the density and mobility of defects, and phase change behaviour, by measuring mechanical energy loss at small strains. We have developed high-resolution instruments and apply the technique to characterisation of new materials.

    (Keyword)Elasticity, Anelasticity, Crystal defects, Diffusion, Phase transformation

Degree 【 display / non-display

  • Bachelor of Engineering, Tohoku University

  • Master of Engineering, Tohoku University

  • Doctor of Engineering, Tohoku University

Academic Society Affiliations 【 display / non-display

  • The Japan Institute of Metals and Materials

  • The Iron and Steel Institute of Japan

  • The Minerals, Metals and Materials Society

  • The Society of Materials Science, Japan

  • Japan Institute of Copper, Japan Copper and Brass Association

Prize 【 display / non-display

  • The 13th Murakami Award for Young Researchers of Materials Science, 1993.05, Murakami Memorial Foundation

  • Award for Distinguished Achievements, 2003.03, The Japan Institute of Metals

  • Acta Materialia Outstanding Reviewer, 2007.04, Acta Materialia Inc

  • The 42nd Award for Excellent Papers, 2008.12, Japan Research Institute for Advanced Copper-base Materials and Technologies


Research seeds 【 display / non-display

  • Non-destructive and quantitative characterisation of defects and impurity atoms in materials

  • Understanding of production processes, properties, and durability of materials governed by atomic diffusion, and material design on their basis

  • Development of novel functional materials based on elastic, anelastic, and/or magnetoelastic effects

Books 【 display / non-display

  • Physical Metallurgy, fifth edition, Volume I, Elsevier B. V., 2014, Multiple Authorship, Walter Steurer, U. Mizutani, M. Inukai, H. Sato, E. S. Zijstra, Arthur D. Pelton, A. L. Greer, Zoltan Balogh, Guido Schmitz, NUMAKURA Hiroshi, William J. Boettinger, Dilip K. Banerjee, W. A. Soffa, David E. Laughlin, H. K. D. H. Bhadeshia, C. M. Wayman

  • The 3rd International Symposium on Steel Science - ISSS-2012: Nanoscale inhomogeneity in steels - Fundamentals and effects on microstructure and properties, The Iron and Steel Institute of Japan, 2012, Multiple Authorship, Zi-Kui Liu, Kaoru SATO, NUMAKURA Hiroshi, Marcel H. F. Sluiter, Elena Pereloma, Goro Miyamoto, SEgenobu Ogata, J. Takahashi, B. C. De Cooman, Masaki Tanaka, Hiroshi Ohtani, Masahiko Hamada, D. Raabe, M. Enomoto, Masaaki Sugiyama

  • Alloy Physics: A Comprehensive Reference, Wiley-VCH, 2007.09, Multiple Authorship, H. Numakura, W. Püschl, W. Pfeiler

  • Diffusion Study in Japan, Research Signpost, 2006, Multiple Authorship, Yoshiaki Iijima, Hiroyuki Nitta, Ryusuke Nakamura, T. Okino, T. Shimozaki, Osamu Taguchi, Takeshi Fujita, Zenji Horita, Kohta Asano, Yoshihiro Yamazaki, Tsutomu Mashimo, Hideyuki Saitoh, Hirofumi Homma, Chan-Gyu Lee, Kuk-Tae Youn, Numakura Hiroshi

Papers 【 display / non-display

  • The relation between amorphous structure and explosive crystallization of sputter-deposited amorphous germanium thin films, Japanese Journal of Applied Physics, 2019.03, Masayuki Okugawa, Ryusuke Nakamura, Hiroshi Numakura, Akira Heya, Naoto Matsuo, Hidehiro Yasuda

  • Structure of crystallized particles in sputter-deposited amorphous germanium films, Journal of Applied Crystallography, 2018.08, Masayuki Okugawa, Ryusuke Nakamura, Akihiko Hirata, Manabu Ishimaru, Hidehiro Yasuda, Hiroshi Numakura

  • Effect of post-weld heat treatment on fatigue reliability of super-duplex-stainless-steel weldments, ISIJ International, 2017.07, Ryujiro Udo, Hiroshi Numakura

  • Thermal crystallization of sputter-deposited amorphous Ge films: Competition of diamond cubic and hexagonal phases, AIP Advances, 2016.12, M. Okugawa, R. Nakamura, M. Ishimaru, H. Yasuda, H. Numakura

  • Crystallization of sputter-deposited amorphous Ge films by electron irradiation: Effect of low-flux pre-irradiation, Journal of Applied Physics, 2016.10, M. Okugawa, R. Nakamura, M. Ishimaru, H. Yasuda, H. Numakura

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Charge of class subject 【 display / non-display

  • Materials and Industrial Engineering

  • Microstructure of MaterialsI

  • Microstructure of MaterialsII

  • Selected Topics in Microstructure Designing

  • Introduction to Materials, Chemistry and Chemical Engineering

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