論文

Single-track investigation of rapid solidification conditions of Hastelloy-X Ni-based superalloy in laser powder-bed fusion and applicability of columnar equiaxed transition criteria

Masayuki Okugawa, Haruki Yoshima, Yuheng Liu, Pan Wang, Yuichiro Koizumi, Takayoshi Nakano:
Single-track investigation of rapid solidification conditions of Hastelloy-X Ni-based superalloy in laser powder-bed fusion and applicability of columnar equiaxed transition criteria, Virtual and Physical Prototyping, 21 (2026) e2639906.

DOI: https://doi.org/10.1080/17452759.2026.2639906

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Data-Selective Machine Learning Framework (DSML) for Defect-Aware, Interpretable Yield-Strength Prediction for LPBF Fabricated AlSi10Mg Alloys

Jeong Ah Lee, Yeon Woo Kim, Takayoshi Nakano, Hyomoon Joo, Jeong Min Park*, Hyoung Seop Kim*:
Data-Selective Machine Learning Framework (DSML) for Defect-Aware, Interpretable Yield-Strength Prediction for LPBF Fabricated AlSi10Mg Alloys, Acta Materialia, in press (2026).

論文

Microstructural evolution and wear resistance enhancement of electron-beam-fabricated nickel titanium coatings on titanium by heat treatment

Lei Wang, Masayuki Okugawa, Yuheng Liu, Ken Cho, Hiroyuki Y. Yasuda, Takayoshi Nakano, Yuichiro Koizumi: Microstructural evolution and wear resistance enhancement of electron-beam-fabricated nickel titanium coatings on titanium by heat treatment, Materials Transactions, (2026), in press.

論文

In situ Alloyed Refractory High Entropy Alloy by Laser Powder Bed Fusion

Yong Seong Kim, Ozkan Gokcekaya, Ryosuke Ozasa, Takayoshi Nakano:
In situ Alloyed Refractory High Entropy Alloy by Laser Powder Bed Fusion, Materials Science Forum, 1175 (2026) 105-110.

DOI: 10.4028/p-0OnKo3

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Influence of Hierarchical Structure on Mechanical Properties of Additive Manufactured IN718 Alloys

Kippei Yamashita, Ken Cho, Takuma Saito, Taisuke Sasaki, Katsuhiko Sawaizumi, Masayuki Okugawa, Yuichiro Koizumi, Takayoshi Nakano, Hiroyuki Y. Yasuda:
Influence of Hierarchical Structure on Mechanical Properties of Additive Manufactured IN718 Alloys, Materials Science Forum, 1175 (2026) 129-134.

DOI: 10.4028/p-1DlHhB

論文

Manuscript number Integrated computational and experimental study on rapid heating and cooling in powder-bed fusion of Al-Si hypoeutectic alloys

Masayuki Okugawa*, Yuya Furushiro, Seori Motoyama, Yuheng Liu, Takayoshi Nakano, Yuichiro Koizumi: Manuscript number Integrated computational and experimental study on rapid heating and cooling in powder-bed fusion of Al-Si hypoeutectic alloys, Materials Transactions, (2026), in press.

論文

Identification of lattice defects in laser powder bed fusion-fabricated 316L stainless steel by positron annihilation spectroscopy

Masataka Mizuno*, Masaki Otsuka, Kazuhisa Sato, Takuya Ishimoto, Takayoshi Nakano, Hideki Araki: Identification of lattice defects in laser powder bed fusion-fabricated 316L stainless steel by positron annihilation spectroscopy, Journal of Materials Research and Technology, in press, 40, (2026), 188-193.

DOI: https://doi.org/10.1016/j.jmrt.2025.12.147

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Investigation of lattice defects in β-type Ti-Cr alloys fabricated via laser powder bed fusion using positron annihilation spectroscopy and first-principles calculations

Masataka Mizuno, Ryosuke Takahagi, Ryosuke Ozasa, Takayoshi Nakano, Hideki Araki:
Investigation of lattice defects in β-type Ti-Cr alloys fabricated via laser powder bed fusion using positron annihilation spectroscopy and first-principles calculations, Journal of Physics: Conference Series, 3149, (2025), 012010.

DOI: https://iopscience.iop.org/article/10.1088/1742-6596/3149/1/012010

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論文

Effect of nanoscale cellular structure on the mechanical properties of Inconel 718 with unique hierarchical structure fabricated by laser powder bed fusion

Ken Cho, Kippei Yamashita, Shinnosuke Kakutani, Takuma Saito, Taisuke Sasaki, Katsuhiko Sawaizumi, Masayuki Okugawa, Yuichiro Koizumi, Tsuyoshi Mayama, Taichi Kikukawa, Ozkan Gokcekaya, Takuya Ishimoto, Hajime Kimizuka, Wu Gong, Takuro Kawasaki, Stefanus Harjo, Takayoshi Nakano, Hiroyuki Y. Yasuda*: Effect of nanoscale cellular structure on the mechanical properties of Inconel 718 with unique hierarchical structure fabricated by laser powder bed fusion, Acta Materialia.

DOI: https://doi.org/10.1016/j.actamat.2025.121696

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Wear and corrosion performance of textured Hastelloy-X fabricated by laser powder bed fusion: Process window and microstructural features

Sung-Hyun Park, Fatmanur Ayten, Asli Gunay Bulutsuz, Ozkan Gokcekaya*, Muhammed Enes İlgazi, Hakan Yilmazer, Burak Dikici, Takayoshi Nakano*:
Wear and corrosion performance of textured Hastelloy-X fabricated by laser powder bed fusion: Process window and microstructural features, Journal of Materials Research and Technology, 39, (2025), 6156-6168.

DOI: https://doi.org/10.1016/j.jmrt.2025.10.229

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論文

L-PBF で造形した準安定β型Ti合金におけるヤング率の変化

宮澤啓太郎、小笹良輔、内芝旭祥、清水佑太、中野貴由：L-PBF で造形した準安定β型Ti合金におけるヤング率の変化、スマートプロセス学会誌、14[5], (2025), pp.258-263.

論文

金属3Dプリンタ用レーザ照射による非等量Ti-Nb-Mo-Ta-W系ハイエントロピー合金の組織形成挙動

小笹良輔、Kim Yong Seong、朝倉光平、堀尾尚平、鰐渕良祐、中野貴由：金属3Dプリンタ用レーザ照射による非等量Ti-Nb-Mo-Ta-W系ハイエントロピー合金の組織形成挙動、スマートプロセス学会誌、14[5], (2025), pp.253-257.

論文

生体用AMインプラント材料の抗菌特性評価のためのin vitro 共培養モデルの構築

松坂匡晃、小坂朋生、山野大陸、船奥和真、劉甜、松垣あいら、中野貴由：生体用AMインプラント材料の抗菌特性評価のためのin vitro 共培養モデルの構築、スマートプロセス学会誌、14[5], (2025), pp.249-252.

論文

NiTi coating formation on Ti for enhanced wear resistance utilizing electron-beam additive manufacturing technique

Lei Wang, Masayuki Okugawa, Yuheng Liu , Ken Cho, Hiroyuki Y. Yasuda, Takayoshi Nakano, Yuichiro Koizumi:
NiTi coating formation on Ti for enhanced wear resistance utilizing electron-beam additive manufacturing technique,
Surfaces and Interfaces, 72, (2025), 107024; 1-14.
DOI: https://doi.org/10.1016/j.surfin.2025.107024

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論文

Comparison and Evolution of Ti6Al4V Bioalloy Fabricated by Laser and Electron beam Additive Manufacturing: Mechanical Features and Anisotropic Electrochemical Properties

Parinaz Mofazali, Masoud Atapour*, Ozkan Gokcekaya, Sung-Hyun. Park, Batur Ercan, Takayoshi Nakano: Comparison and Evolution of Ti6Al4V Bioalloy Fabricated by Laser and Electron beam Additive Manufacturing: Mechanical Features and Anisotropic Electrochemical Properties,
Materials Today Communications, (2025), 113124: 1-14.
DOI: https://doi.org/10.1016/j.mtcomm.2025.113124

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論文

Remarkable Strengthening Effects of Cells in Laser Powder Bed Fusion Processed Inconel 718

Taichi Kikukawa, Takuya Ishimoto*, Hyoung Seop Kim, Takayoshi Nakano*:
Remarkable Strengthening Effects of Cells in Laser Powder Bed Fusion Processed Inconel 718,
Materials Research Letters, (2025).
DOI: https://doi.org/10.1080/21663831.2025.2522801

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Impacts of excess vacancies on order-domain growth in D03 Fe3Al intermetallic phase

Masayuki Okugawa, Madoka Watanabe, Satoshi Ichikawa, Kazuhisa Sato, Yuheng Liu, Hiroyuki Y. Yasuda, Yuichiro Koizumi:

Impacts of excess vacancies on order-domain growth in D03 Fe3Al intermetallic phase,

Scripta Materialia, Vol.267, 1 October 2025, 116812

DOI:https://doi.org/10.1016/j.scriptamat.2025.116812

論文

Layered Na₂Ti₃O₇-supported Ru catalyst for ambient CO₂ methanation

Hyo-Jin Kim, Kohsuke Mori*, Satoshi Ichikawa, Takayoshi Nakano, Hiromi Yamashita:
Layered Na₂Ti₃O₇-supported Ru catalyst for ambient CO₂ methanation,
Nature Communications, 16, (2025), 2697; 1-9.
DOI: https://doi.org/10.1038/s41467-025-57954-9

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論文

On the enhanced creep performance in Ti6246 achieved through Laser Powder Bed Fusion (LPBF) processing

Prince Valentine Cobbinah*, Sae Matsunaga, Yoshiaki Toda, Ryosuke Ozasa, Takuya Ishimoto, Takayoshi Nakano, Tsutomu Ito, Yoko Yamabe-Mitarai:*
On the enhanced creep performance in Ti6246 achieved through Laser Powder Bed Fusion (LPBF) processing,
Metallurgical and Materials Transactions A, (2025), in press.
DOI: https://doi.org/10.1007/s11661-025-07759-8

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論文

Raking and Fusing Behaviors during Fabrication of Multiple-layers in Powder Bed Fusion: An integrated discrete Element and computational thermal fluid Dynamics Study

Shuhei Mino, Masayuki Okugawa, Takayoshi Nakano, Yuichiro Koizumi:
Raking and Fusing Behaviors during Fabrication of Multiple-layers in Powder Bed Fusion: An integrated discrete Element and computational thermal fluid Dynamics Study
Journal of the Japan Society of Powder and Powder Metallurgy, 72, (2025), 16P-T6-11; S1465-S1469.
https://doi.org/10.2497/jjspm.16P-T6-11

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