Faculty Profiles - KOBASHI, Makoto

Papers - KOBASHI, Makoto

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Architected materials informatics: Construction and application to cellular-structured heat sink optimization

Suzuki, A; Nakatani, H; Nakagawa, S; Kobashi, M; Tsuji, Y

ACTA MATERIALIA Vol. 283 2025.1

Anomalous temperature-dependent strength of copper alloy manufactured by laser-beam powder bed fusion

Kim, D; Takata, N; Umeda, J; Shimizu, T; Kobashi, M

ADDITIVE MANUFACTURING LETTERS Vol. 11 2024.12

Investigating the effect of mechanical activation duration (MAD) on the microstructure and corrosion behavior of TiAl intermetallic compounds (vol 33, 104690, 2024)

Karimi, A; Adeli, M; Kobashi, M

ADVANCED POWDER TECHNOLOGY Vol. 35 ( 12 ) 2024.12

Fe/polymer joining via Fe/TiB<sub>2</sub> composite structures via in-situ laser-induced reaction of Fe-Ti-B system: Effect of powder composition

Zhou, SY; Omiya, K; Ueda, Y; Suzuki, A; Takata, N; Kobashi, M

JOURNAL OF ADVANCED JOINING PROCESSES Vol. 10 2024.11

Effect of heat treatments on inhomogeneous deformation of the melt-pool structure of Al-Si alloy manufactured via laser powder bed fusion

Otani, Y; Takata, N; Suzuki, A; Kobashi, M; Kato, M

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Vol. 909 2024.9

Pretreatment-free SERS sensing of microplastics using a self-attention-based neural network on hierarchically porous Ag foams

Guselnikova, O; Trelin, A; Kang, YQ; Postnikov, P; Kobashi, M; Suzuki, A; Shrestha, LK; Henzie, J; Yamauchi, Y

NATURE COMMUNICATIONS Vol. 15 ( 1 ) 2024.5

Additive manufacturing for 3D microchannel structure using La(Fe x Si 1-x ) 13 magnetic refrigerant via laser powder bed fusion

Imaizumi, K; Fujita, A; Suzuki, A; Kobashi, M; Kato, M

ADDITIVE MANUFACTURING Vol. 83 2024.3

Introducing Hatch Spacing into Deposited Energy Density toward Efficient Optimization of Laser Powder Bed Fusion Process Parameters

Kunieda, M; Suzuki, A; Takata, N; Kato, M; Kobashi, M

JOURNAL OF THE JAPAN INSTITUTE OF METALS AND MATERIALS Vol. 88 ( 9 ) page： 1099 - 1106 2024

Persistent Homology Analysis of the Microstructure of Laser-Powder-Bed-Fused Al–12Si Alloy Reviewed

Asuka Suzuki, Yusuke Sasa, Makoto Kobashi, Masaki Kato, Masahito Segawa, Yusuke Shimono, Sukeharu Nomoto

Materials Vol. 16 ( 22 ) page： 7228 2023.11

Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI AG

The laser powder bed fusion (L-PBF) process provides the cellular microstructure (primary α phase surrounded by a eutectic Si network) inside hypo-eutectic Al–Si alloys. The microstructure changes to the particle-dispersed microstructure with heat treatments at around 500 °C. The microstructural change leads to a significant reduction in the tensile strength. However, the microstructural descriptors representing the cellular and particle-dispersed microstructures have not been established, resulting in difficulty in terms of discussion regarding the structure–property relationship. In this study, an attempt was made to analyze the microstructure in L-PBF-built and subsequently heat-treated Al–12Si (mass%) alloys using the persistent homology, which can analyze the spatial distributions and connections of secondary phases. The zero-dimensional persistent homology revealed that the spacing between adjacent Si particles was independent of Si particle size in the as-built alloy, whereas fewer Si particles existed near large Si particles in the heat-treated alloy. Furthermore, the first principal component of a one-dimensional persistent homology diagram would represent the microstructural characteristics from cellular to particle-dispersed morphology. These microstructural descriptors were strongly correlated with the tensile and yield strengths. This study provides a new insight into the microstructural indices describing unique microstructures in L-PBF-built alloys.

DOI： 10.3390/ma16227228

Web of Science

PubMed

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Machine learning surrogate modeling toward the design of lattice-structured heat sinks fabricated by additive manufacturing Reviewed

Asuka Suzuki, Hideto Nakatani, Makoto Kobashi

Materials & Design Vol. 230 page： 111969 2023.6

Mechanical coupling and tuned anisotropic elasticity: Numerical and experimental material design for shear-normal and shear-shear interactions Reviewed International coauthorship

Molavitabrizi, D; Suzuki, A; Kobashi, M; Mousavi, SM

MATERIALS & DESIGN Vol. 230 page： 111950 2023.6

Fabrication of Al-CNT composite with high hardness and electrical conductivity by controlling Al4C3 formation Reviewed

Kim, D; Hirayama, Y; Liu, Z; Takagi, K; Kobashi, M

JOURNAL OF ALLOYS AND COMPOUNDS Vol. 942 page： 169102 2023.5

B2-structured Fe<inf>3</inf>Al alloy manufactured by laser powder bed fusion: Processing, microstructure and mechanical performance Reviewed International coauthorship

A. M. Vilardell, L. Pelcastre, D. Nikas, P. Krakhmalev, M. Kato, N. Takata, M. Kobashi

Intermetallics Vol. 156 page： 107849 2023.5

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

Prealloyed Fe3Al was successfully manufactured by laser powder bed fusion. The best set of process parameters led to parts with a relative density of 99.5 %, a surface roughness, Sa, of 31.5 ± 5.6 μm and a hardness of 319 ± 14 HV0.1. Its microstructure as well as its mechanical properties at room and high temperatures were analyzed. The results of the chemical composition showed minor variations in aluminum content oscillating between 21 and 28 at.% along the melt pool. Additionally, elongated grains were observed to grow parallel to the building direction, as well as the development of a weak {001} texture along the building direction. The mechanical properties were influenced by the temperature. Compression tests showed a loss in strength with the increase in temperature, from a yield strength of 621 ± 40 MPa at room temperature to 89 ± 20 MPa at 650 °C. Reciprocating sliding wear tests showed that fragmentation of the intermetallic at room temperature occurs, whereas plastic deformation dominated at higher temperatures. For all temperatures, tribochemical wear was also present due to the oxidation of wear debris.

DOI： 10.1016/j.intermet.2023.107849

Web of Science

Scopus

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Ultra-high coercivity Sm-Co bulk magnets with remarkable thermal stability Reviewed

Park, K; Hirayama, Y; Wang, J; Kobashi, M

SCRIPTA MATERIALIA Vol. 218 2022.9

Iron aluminides as an alternative binder for cemented carbides: A review and perspective towards additive manufacturing Reviewed International coauthorship

Vilardell, AM; Cinca, N; Tarres, E; Kobashi, M

MATERIALS TODAY COMMUNICATIONS Vol. 31 2022.6

Laser powder bed fusion of polyamide-composite for antibacterial applications: Characterization and properties Reviewed International coauthorship

Vilardell, AM; Yadroitsava, I; Wolf, WKC; Du Plessis, A; Tshibalanganda, M; Kouprianoff, DP; Garcia-Giralt, N; Kobashi, M; Yadroitsev, I

MATERIALS TODAY COMMUNICATIONS Vol. 31 2022.6

Exchange-Coupled SmCo5/Fe Nanocomposite Magnet Prepared by Low Oxygen Powder Metallurgy Process Reviewed

Park K., Hirayama Y., Yamaguchi W., Kobashi M., Takagi K.

IEEE TRANSACTIONS ON MAGNETICS Vol. 58 ( 2 ) 2022.2

Anisotropic Sm-Co nanopowder prepared by induction thermal plasma Reviewed

Kwangjae Park, Yusuke Hirayama, Masaya Shigeta, Zheng Liu, Makoto Kobashi, Kenta Takagi

Journal of Alloys and Compounds Vol. 882 page： 160633 - 160633 2021.11

Dual plateau stress of C15-type topologically close-packed lattice structures additive-manufactured by laser powder bed fusion Reviewed

Xiaoyang Liu, Asuka Suzuki, Naoki Takata, Makoto Kobashi, Masaki Kato

SCRIPTA MATERIALIA Vol. 202 2021.9

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：PERGAMON-ELSEVIER SCIENCE LTD

Imitating crystal structures offers new avenues to design lattice structures composed of unit cells with nodes (act as atoms) and struts (act as atomic bonds). We found out unique dual plateau regions in the stress-strain curves of lattice structures inspired by topologically close-packed (TCP) structure of C15 Laves phase (AB(2)-type intermetallic compounds) and manufactured via the laser powder bed fusion. X-ray computed tomography of compressively deformed lattice structures as well as finite element analysis revealed that the existence of two kinds of units with different relative density caused the dual plateau regions. In addition, the C15 lattice structures exhibited a hybrid deformation mode of bending- and stretch-dominated deformations and can absorb high total energy of 5.0 MJ.m(-3) in two stress levels. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.scriptamat.2021.114003

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Highly Conductive Al/Al Interfaces in Ultrafine Grained Al Compact Prepared by Low Oxygen Powder Metallurgy Technique Reviewed

Kim, D; Hirayama, Y; Liu, Z; Kwon, H; Kobashi, M; Takagi, K

NANOMATERIALS Vol. 11 ( 5 ) 2021.5

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Papers - KOBASHI, Makoto