最新の30件

2026.06.27

【解説】ASM International発行のAdvanced Materials & Processesに解説記事が掲載されました。

Hideki Kanematsu, Akiko Ogawa, Akira Suzuki, Takayoshi Nakano:
HOW SILICONE-BASED INORGANIC COATINGS HELP PROTECT CULTURAL HERITAGE AND HISTORICAL MONUMENTS
-Case studies on historical structures exposed to the natural environment show how a novel coating helps create a protective film with ceramic-like stability while preserving the original appearance,
Advanced Materials & Processes, 184 [4], (2026), 32-34.
PDFはこちら

2026.06.23

【論文】AMで造形した316Lステンレス鋼の機械学習を用いた結晶粒径の解析に関する論文が、Materials & DesignにOA 論文として掲載されました。

Shiro Ihara*, Shunsuke Sato, Ryosuke Ozasa, Takayoshi Nakano, Mitsuhiro Murayama:
Machine learning-assisted grain boundary segmentation reveals nanoscale heat treatment behavior of additively manufactured 316L stainless steel,
Materials & Design, 268, (2026), 116450: 1-10.
DOI: https://doi.org/10.1016/j.matdes.2026.116450

論文はこちら
PDFはこちら

Abstract
Additive manufacturing produces inhomogeneous and anisotropic microstructures that differ from those in conventionally processed materials. Heat treatment is a crucial process to regulate the microstructural properties. Although estimating the resultant microstructure is a challenging issue, visualizing grain boundaries (GBs) would provide fundamental understanding of the mechanism during heat treatment. In this study, we developed a visualization method using electron diffraction mapping in transmission electron microscopy combined with machine learning. By extracting the area where the feature of electron diffraction patterns varies in the mapping data, GB region was successfully visualized. The developed image processing was applied to ex-situ heating observation of an additively manufactured 316L stainless steel (316L SS), and the curvature variation of GB before and after heat treatment was discussed. It was shown that GB bulging was likely observed around existing sub-GBs, causing unevenness in GB migration.

keywords
Electron microscopy; Machine learning; Laser powder bed fusion; Heat treatment; Grain boundary

 

2026.06.22

【論文】Journal of Materials Research and TechnologyにCr造形材のHIPによる機能制御に関する論文が受理され、オンラインでOA 論文として掲載されました。

Ozkan Gokcekaya, Asli Gunay Bulutsuz, Buse Gulec, Ali Gunen, Hakan Yilmazer, Takayoshi Nakano:
Hot isostatic pressing temperature-driven microstructure-tribology relationships in laser powder bed fused pure chromium,
Journal of Materials Research and Technology, (2026), in press.
DOI: https://doi.org/10.1016/j.jmrt.2026.06.191

Abstract
Conventional processing of chromium has long been abandoned due to its high ductile-to-brittle transition temperature (DBTT), which promotes stress-induced cracking during solidification. Nevertheless, chromium and its alloys remain attractive for advanced applications because of their excellent high-temperature stability, oxidation resistance, and tribological performance. In this study, pure chromium was fabricated by laser powder bed fusion (LPBF) using optimized processing parameters, followed by hot isostatic pressing (HIP) at moderate and high temperatures to address LPBF-induced cracking and residual stresses. The influence of HIP temperature on microstructural evolution, mechanical properties, and tribological behavior was systematically investigated. HIP effectively improved densification and reduced internal defects; however, the HIP temperature strongly governed the balance between residual stress relief and grain growth. As-built LPBF chromium exhibited high hardness and wear resistance due to its fine grain structure and retained residual stresses. HIP at a moderate temperature was sufficient to relieve residual stress while preserving the fine microstructure, thereby maintaining favorable mechanical and tribological performance. In contrast, high-temperature HIP promoted pronounced <100> grain growth, which facilitated the formation of a stable oxide layer and enhanced lubricating effects during sliding, but at the expense of mechanical strength due to excessive grain coarsening. These results highlight the critical role of HIP temperature in tailoring microstructure-property relationships in additively manufactured pure chromium and suggest that oxide dispersion strengthening may be an effective strategy to suppress grain growth while leveraging the combined benefits of LPBF and HIP processing for refractory metals.

keywords: Refractory metal; Pure Chromium; Laser powder bed fusion; Hot isostatic pressing; Microstructure; Wear

2026.06.20

【受賞】第46回日本骨形態計測学会（＠一橋講堂）にて中野研究室のD2 森さんが学術奨励賞を、M2竹下くんが若手研究者賞を受賞しました。

〇森陶子、松垣あいら、中野貴由
配列骨芽細胞および配向化骨基質は抗菌特性を発揮する

〇竹下恭平、中西陽平、松坂匡晃、松垣あいら、中野貴由
基質直交配向化が生体組織の微細構造形成に及ぼす影響

骨形態計測学会理事長　福島大学の風間順一郎教授とともに

第46回学会長　東京大学の疋田温彦教授とともに

2026.06.20

【学会】第46回日本骨形態計測学会 (@一橋講堂、2026年6月18~20日)に参加しました。

2026/06/19
シンポジウム1『空間情報・画像解析技術と整形外科医療の融合』第2会場（中会議場3+4（2F））
〇[S1-3] 金属３Dプリンタの基礎と整形外科分野への適用
中野貴由

一般演題3『骨質』第3会場（中会議場1+2（2F））
〇[O3-1]　基質直交配向化が生体組織の微細構造形成に及ぼす影響
竹下恭平、中西陽平、松坂匡晃、松垣あいら、中野貴由

〇[O3-2]　骨インプラント材料設計に向けた新規生体適合性指標の構築
松坂匡晃、松垣あいら、中野貴由

〇[O3-6]　薬剤性骨脆弱化に伴う骨基質配向性変化
齊藤光郁、松垣あいら、中野貴由

〇[O3-7]　配列骨芽細胞および配向化骨基質は抗菌特性を発揮する
森陶子、松垣あいら、中野貴由

一般演題5『骨代謝基礎』第3会場（中会議場1+2（2F））
〇[O5-7]　エラスターゼ誘導性肺気腫マウスではアパタイト配向性が低下する
塚本学、鍋島貴行、真野洋佑、荒川大亮、王克ヨン、小笹良輔、中野貴由、酒井昭典

2026/06/20
シンポジウム3『「骨質update」骨質の基礎から最先端の知見まで』第2会場（中会議場3+4（2F））
〇[S3-1]　骨質指標としての骨基質配向性の基礎と最先端
中野貴由

一般演題8『骨、軟骨評価』第3会場（中会議場1+2（2F））
〇[O8-1]　慢性炎症モデルにおける骨基質配向性変化
松垣あいら、渡邊稜太、中野貴由

集合写真（秋田大学宮腰尚久教授のグループの皆様、ナカシマヘルスフォース高橋さんとともに）

2026.06.19

【論文】六方晶系金属を、LPBFを用いて強い結晶集合組織をもつ単結晶様合金が形成可能であることを世界で初めて示した論文がオンラインで公開となりました。

Ryosuke Ozasa, Yuta Kizawa, Kakeru Okawa, Koji Hagihara, Kazuhisa Sato, Toshiharu Matsumoto, Toko Tokunaga, Naoko Ikeo, Viritpon Srimaneepong, Pan Wang, Dorte Juul Jensen, Takayoshi Nakano*:
Design of a novel scanning strategy for formation of extremely strong textures in hexagonal materials through laser powder bed fusion,
Materials & Design, (2026)
DOI: https://doi.org/10.1016/j.matdes.2026.116307

Abstract
While crystallographic texture control in cubic metals via laser powder bed fusion (LPBF) has been demonstrated in recent years, achieving such control in hexagonal metals remains a significant challenge. In the present work we present a novel route for the development of a very strong texture in a hexagonal close-packed (hcp)-structured Mg alloy through LPBF. It was achieved by employing reciprocal scanning with a 120° rotation between layers, aligning with the symmetry of Mg's hcp crystal structure. This unique scanning strategy was designed through computational simulation of the heat flux in the melt pool and consideration of the six-fold rotational symmetry along the [0001] axis of the hcp structure. The texture formation was driven by preferential <11-20> crystal growth along a direction inclined at approximately 60° to each scanning direction (0°, 120°, and 240°). The LPBF-fabricated specimens showed an anisotropic stress-strain responses in compression test owing to the crystal orientation-dependent selection of operative slip systems, similar to the behavior in a Mg single crystal. These findings highlight the potential in optimizing the scanning strategy by reflecting the symmetry of the crystal structure. This is particularly crucial for LPBF manufacturing non-cubic metals with prominent textures.

Keywords: Laser powder bed fusion; Crystallographic texture; Magnesium; Hexagonal close-packed structure; Crystal growth

2026.06.19

【新聞】六方晶系金属であるMg合金に対して、LPBFを用いることで強い結晶集合組織を持つ単結晶様合金が形成可能であることを世界で初めて示したことに関する記事が本日の日刊工業新聞に掲載されました。

Mg合金で単結晶様組織 阪大など3Dプリンター活用 適用金属拡大に道 日刊工業新聞 2026年6月19日 朝刊18面

2026.06.17

【論文】AMで造形した316Lステンレス鋼の機械学習を用いた結晶粒径の解析に関する論文が、Materials & Designに受理され、OA 論文として公開されます。

Shiro Ihara*, Shunsuke Sato, Ryosuke Ozasa, Takayoshi Nakano, Mitsuhiro Murayama:
Machine learning-assisted grain boundary segmentation reveals nanoscale heat treatment behavior of additively manufactured 316L stainless steel,
Materials & Design, (2026), in press.

2026.06.16

【講演】中野先生がThe 8th International Workshop on Titanium Aluminides (IWTA2026)で招待講演をおこないました。

Takayoshi Nakano:
Control of Microstructure and Crystallographic Texture in Powder Bed Fusion Additive Manufacturing of Metals and Intermetallics
Session 15-3 Microstructure 1, Chairperson: Florian Pyczak, 14:00-14:30, 15, June (Mon.), 2026, The 8th International Workshop on Titanium Aluminides (IWTA2026)

2026.06.11

【論文】International Journal of Lightweight Materials and Manufacture（IF=4.6）に、電子ビーム粉末床溶融結合法（EB-PBF）で作製したTi-6Al-4V製ウェーブスプリングの設計・プロセス・特性評価について示した論文がオンラインで公開されました。

Niyonkuru Benjamin, Kashif Azher, Muhammad Rizwan ul Haq, Ozkan Gokcekaya, Takayoshi Nakano, Aamer Nazir:
Design-process-property characterization of Ti-6Al-4V wave springs manufactured via the electron beam powder bed fusion process,
International Journal of Lightweight Materials and Manufacture, (2026)
DOI: https://doi.org/10.1016/j.ijlmm.2026.05.004

Abstract
Wave springs (WSs) are compact, lightweight alternatives to helical springs; although additive manufacturing enables complex WS geometries, prior work has focused on polymers. Herein, we design and manufacture Ti-6Al-4V WSs via electron beam additive manufacturing (EBAM). Seven WSs were designed using SolidWorks, and the fabricated specimens were evaluated through geometrical accuracy, surface roughness, quasi-static compression testing, and material characterization techniques. EBAM produced near-net geometry compared with the CAD, showing only minor deviations, with the lowest being 0.04 mm (WS2) and the largest being a 2.7 mm reduction in the height of WS7. In contrast, WS7 exhibited the smoothest top surface, with arithmetic mean height (Sa) values of 0.007 μm, whereas the surface along the build orientation was considerably rougher, with Sa values ranging from 45.84 μm (WS5) to 463 μm (WS1). WS2 and WS3 showed the best compressive response, sustaining peak loads of 6.84 kN and 8.267 kN, with energy absorption of 74 J and 75 J, respectively. SEM revealed unfused powder sticking to the sidewalls, which is linked with the higher Sa values on build-direction faces, while XRD showed only α-Ti (HCP) peaks. This study enables EBAM WS manufacturability and explicitly links geometry, process, and performance.

keyword: Wave Springs (WSs); Electron Beam Additive Manufacturing (EBAM); Quasi-static Compression; Geometric Accuracy; Surface Roughness; Material Characterization

2026.06.09

【訪問】防衛装備庁の伊藤秀人装備官（海将）らに3DPTec統合センターを訪問いただきました。

防衛装備庁の伊藤秀人装備官（海将）らに3DPTec統合センターをご訪問いただきました。

2026.06.07

【シンポジウム】中野先生が日本学術会議生体医工学分科会副委員長として、仙台で開催された第65回日本生体医工学会大会に出席しました。

大阪大学歯学部教授山口哲先生とともに

2026.06.02

【論文】等軸-柱状遷移に関するAMによるステンレス鋼の研究に関してISIJ Internationalに受理されました。

Kishin Fukushima, Masayuki Okugawa*, Yuichiro Miyata, Rei Miyawaki, Yuheng Liu, Yuichiro Koizumi, Takayoshi Nakano:
Systematic study of rapid solidification in laser powder-bed fusion of stainless steels to verify applicability of columnar equiaxed Transition,
ISIJ International, (2026), in press.

2026.05.29

【新聞】金属３Ｄプリンターを用いて、高品質なニッケル基超合金単結晶の獲得に成功したことに関する記事が本日の日刊工業新聞に掲載されました。

高品質単結晶を積層造形 ニッケル基超合金 阪大と物材機構が成功 ワンプロセス製造に道、日刊工業新聞、17面、2026年5月29日朝刊

2026.05.28

【講演】7月19日に東京・日本橋で行われる日本3Dプリンティング矯正歯科学会第5回学術大会にて、中野先生が教育講演を行います。テーマは「先端AM技術と独創的アイデアで拓く歯科医療革命」です。時間のある方はぜひご参加ください。

会場となる野村コンファレンスプラザ日本橋

講演大会ポスター

教育講演

2026.05.27

【論文】International Journal of Lightweight Materials and Manufacture（Elsevier）にトルコとの共同研究で、PBF-EBで作製したTi-64合金のスプリングのデザインと特性との関係に関する論文が受理されました。

Niyonkuru Benjamin, Kashif Azher, Muhammad Rizwan ul Haq, Ozkan Gokcekaya, Takayoshi Nakano, Aamer Nazir*:
Design-process-property characterization of Ti-6Al-4V wave springs manufactured via the electron beam powder bed fusion process,
International Journal of Lightweight Materials and Manufacture, (2026), in press.

2026.05.27

【論文】六方晶系金属を、LPBFを用いて強い結晶集合組織をもつ単結晶様合金が形成可能であることを世界で初めて示した論文が、Materials & Designに受理されました。

Ryosuke Ozasa, Yuta Kizawa, Kakeru Okawa, Koji Hagihara, Kazuhisa Sato, Toshiharu Matsumoto, Toko Tokunaga, Naoko Ikeo, Viritpon Srimaneepong, Pan Wang, Dorte Juul Jensen, Takayoshi Nakano*:
Design of a novel scanning strategy for formation of extremely strong textures in hexagonal materials through laser powder bed fusion,
Materials & Design, (2026), in press.

2026.05.23

【講演】中野先生が、第99回日本整形外科学会学術総会でシンポジウム招待講演を行いました。

中野貴由:
骨質医療を見据えたバイオマテリアル研究の進歩、
第99回日本整形外科学会学術総会、
シンポジウム47 『過去 100 年の進歩 ―基礎―』、
2026年5月23日（土） 8:00～9:20、第1会場（神戸ポートピアホテル 南館1F ポートピアホール）

2026.05.22

【新聞】第10回ものづくり日本大賞で内閣総理大臣賞を受賞した、中野研で研究・開発された脊椎スペーサーを製造販売するナカシマヘルスフォースの記事が、5月22日の日刊工業新聞に掲載されました。

第10回ものづくり日本大賞　技を極める（2）内閣総理大臣賞 ナカシマヘルスフォース、日刊工業新聞、12面、2026年5月22日朝刊

2026.05.22

【新聞】阪大応援団の新団旗の「竿頭」を、3DPTec統合センターにて金属3D造形しました。学章をモチーフにした複雑かつ独自性の高いデザインと、空気抵抗を抑えた高い機能性の両立が実現されています。本日の日刊工業新聞に掲載されました。

ポール先端部を3D造形、阪大応援団が新団旗軽量化、日刊工業新聞、28面、2026年5月22日朝刊

2026.05.13

【論文】PBF-LB/Mにより単結晶化度の高いIN738LCの作製に成功したことがMaterials & Design（Elsevier）に受理され、OA論文として掲載されました。

Masayuki Okugawa*, Kazufumi Nose, Sei Hirooka, Sukeharu Nomoto, Yuheng Liu, Makoto Watanabe, Yuichiro Koizumi*, Takayoshi Nakano:
Fully single-crystallization of IN738LC Ni-based superalloy fabricated by laser powder-bed fusion through optimal thermal annealing,
Materials & Design, 266, (2026), 116222: 1-11.

DOI: https://doi.org/10.1016/j.matdes.2026.116222

論文はこちら
PDFはこちら

Abstract
The application of additive manufacturing (AM) to Ni-based superalloys has attracted considerable attention because it enables the production of high-temperature parts that are lighter, integrally formed, and less expensive. However, single-crystal fabrication of precipitation-hardened Ni-based superalloys using AM remains challenging. This study demonstrates that a single crystal (SX) of the IN738LC Ni-based superalloy can be fabricated via laser powder bed fusion (PBF-LB) and the quality of the built SX part can be improved via optimal thermal annealing. The as-fabricated part exhibits inhomogeneities in crystal orientation: the central area is a single crystal, whereas the edges are polycrystalline. The crystal orientation of the single-crystal region is largely affected by gas flow during the build, which could be detected by the in-process melt pool monitoring system. Additionally, significant solute-element segregation is observed in the microstructure of the single-crystal region, consistent with the distribution predicted by the multi-phase-field simulation. Notably, we found that anomalous grain growth, induced by optimal annealing at 1200 °C, selectively expands the SX region while eliminating solute-element segregation, thereby improving the overall quality of the single-crystal part. These findings provide insight into the development of single-crystal fabrication via the PBF-LB process for aerospace and energy applications.

keywords: Additive manufacturing; Laser powder bed fusion; Ni-based superalloy; Single-crystal fabrication; µ-Helix scan

2026.05.11

【HP】ヒット数が43万件を突破！

中野研HPのヒット数が43万件を突破しました。
いつもご覧いただき、ありがとうございます。

2026.05.09

【行事】中野研究室恒例の新入生歓迎BBQを行いました。

中野研究室恒例の新入生歓迎BBQを服部緑地公園にて行いました。
OB, OGの方にも多数参加していただき、今年も非常に盛り上がりました。
今年はカンガルー肉をはじめとしたオリジナリティにあふれる食材も登場し、終始にぎやかで愉快なひとときとなりました！

2026.05.08

【視察】3DPTec統合センターを、三菱重工（株）大宮名誉顧問殿（元 会長・社長）ご一行が視察されました。

3DPTec統合センターを、三菱重工（株）大宮名誉顧問殿（元 会長・社長）ご一行が視察されました。

三菱重工（株）大宮名誉顧問（前列左から3番目）、有田執行役員（エネルギードメイン　副ドメイン長）（前列左から5番目）藤田様（長崎造船所所長、スチームパワー事業部長）（前列一番右）安田副センター長（前列一番左）、前川特任教授（元副社長）（前列左から２番目）、中野センター長（前列左から４番目）、後列右から、木村技術職員、趙准教授、桐原シグマクシス常務執行役員

2026.04.30

【学会】中野研究室のメンバーが 2026 MRS Spring Meeting（@Honolulu, United States of America, 4月26日～5月1日）に参加しています。

2026/04/27
〇Creation of Materials by Super-Thermal Field in Additive Manufacturing--From Digital-Twin Science to the Future of Non-Equilibrium Materials Design
Yuichiro Koizumi, Masayuki Okugawa, Yoshitaka Adachi, Kohei Morishita, Kazuhisa Sato, Yoshiaki Toda, Takuya Ishimoto, Teiichi Kimura, Takayoshi Nakano

Invited Speaker
〇Control of Crystallographic Textures and Macroscopic Shapes via Metal Additive Manufacturing
Takayoshi Nakano

2026/04/28
Invited Speaker
〇Creep Deformation Mechanism of LPBFed Near α, and Near β - Ti Alloys
Yoko Yamabe-Mitarai, Yoshiaki Toda, Tetsuya Matsunaga, Ryosuke Ozasa, Takuya Ishimoto, Tsutomu Ito, Takayoshi Nakano

〇Control of Microstructure and Functionality of Metastable Beta-Type Titanium Alloy Through Laser Powder Bed Fusion
Keitaro Miyasawa, Ryosuke Ozasa, Takayoshi Nakano

〇Microstructural Design of β-Phase Ti Alloys with Low Young's Modulus
Masakazu Tane, Takuya Ishimoto, Takayoshi Nakano

〇Guiding Osteogenic Differentiation of Mesenchymal Stromal Cells by Periodic Grooved Surfaces Fabricated via Metal Additive Manufacturing
Tadaaki Matsuzaka, Aira Matsugaki, Takayoshi Nakano

Invited Speaker
〇Microstructure Control of TiAl Alloys by Electron Beam Powder Bed Fusion
Hiroyuki Yasuda, Ken Cho, Masao Takeyama, Takayoshi Nakano

〇Strengthening of IN718 by the Artificial Introduction of Interfaces Between Differently Oriented Crystallographic Regions in L-PBF
Taichi Kikukawa, Takuya Ishimoto, Tsuyoshi Mayama, Takayoshi Nakano

〇Neutron Diffraction Study of Internal Residual Stress Distribution in Stainless Steel Fabricated by Laser Powder Bed Fusion
Ken Cho, Koki Tanaka, Takayoshi Nakano, Yuichiro Koizumi and Hiroyuki Yasuda

2026/04/29
〇APB Superelasticity in Fe3Al Single Crystals Fabricated by Laser Powder Bed Fusion
Yuheng Liu, Tsubasa Sato, Masayuki Okugawa, Kazuhisa Sato, Yoshitaka Adachi, Jerome Adrien, Eric Maire, Hiroyuki Yasuda, Takayoshi Nakano, Yuichiro Koizumi

集合写真（大阪大学 小泉雄一郎先生（一番左）とともに）

2026.04.30

【論文】Taylor & FrancisのTransactions of the IMFにバイオフィルムに関する論文が受理されました。

Hideyuki Kanematsu*, Akiko Ogawa, Ryoichi Ichino, Takayoshi Nakano:
International Standards for Evaluating Antibacterial, Antiviral, and Antibiofilm Properties of Surface-Finished Materials: A Critical Review
Transactions of the IMF, (2026), in press.

DOI: https://doi.org/10.1080/00202967.2026.2668841

2026.04.30

【論文】レーザー粉末床溶融法（L-PBF）の超急冷を用いて、結晶配向と高Sn含有準安定状態を実現したβ-Ti合金の機能性向上に関する論文がAdditive Manufacturing誌（IF＝11.1）にオープンアクセスとして掲載されました。

Naoki Nohira*, Cheng Chen, Yilin Jin, Wan-Ting Chiu, Akira Umise, Takeshi Teramoto, Masaki Tahara*, Ryosuke Ozasa, Takuya Ishimoto, Yuichiro Koizumi, Takayoshi Nakano, Hideki Hosoda:
Introducing a novel fabrication route for metastable β-type Ti-Cr-Sn alloys with ultra-high Sn content using pure elemental mixed powders via laser powder bed fusion,
Additive Manufacturing, (2026), 124, 105213; 1-12.

DOI: https://doi.org/10.1016/j.addma.2026.105213

論文はこちら
PDFはこちら

Abstract
This study investigates the fabrication of ultra-high Sn-containing metastable β-type Ti-Cr-Sn alloys using Laser Powder Bed Fusion (L-PBF). By utilizing the rapid solidification inherent to L-PBF, retention of an ultra-high Sn metastable β phase at room temperature was achieved in compositions that are difficult to obtain via conventional processing routes. To address a key challenge in L-PBF, the high material cost associated with pre-alloyed powders, a mixture of pure elemental powders was employed as a cost-effective alternative feedstock. The effects of laser power on the microstructure, phase constitution, crystallographic texture, and mechanical properties of the as-built specimens were systematically evaluated. The results demonstrate that L-PBF successfully produced a homogeneous ultra-high Sn β solid solution while effectively suppressing the formation of ω phase and Ti₃Sn compounds. Under the highest laser power condition of 360 W, complete melting and the formation of a single β phase were achieved. The conventional unidirectional laser scanning strategy (X-scan), in which the scanning direction is kept constant between layers, resulted in <110>_β alignment along the build direction and <100>_β alignment along the scan direction. The specimen fabricated at 360 W exhibited the most homogeneous microstructure, together with appropriate strength, excellent ductility, and low Young's modulus. These findings demonstrate the feasibility of low-cost processing via L-PBF while achieving enhanced functional performance in high-Sn metastable β-Ti alloys.

keywords: Additive manufacturing; β-Ti alloys; Laser powder bed fusion; Metastable; Ti-Cr-Sn

2026.04.26

【招待講演】中野先生が2026 MRS Spring Meetingで招待講演をしました。

Takayoshi Nakano:
Control of crystallographic textures and macroscopic shapes via metal additive manufacturing,
Creation of Materials by Super-Thermal Field in Additive Manufacturing--From Digital-Twin Science to the Future of Non-Equilibrium Materials Design,
2026 MRS Spring Meeting,
Honolulu, 27th April 2026, 1:45pm - 2:15pm, Makiki Room (2F), Prince Wikiki

招待講演の様子

 

2026.04.25

【論文】Materials Transactionsに、電子ビーム積層造形法で作製した純チタン表面上のNiTiコーティングにおいて、熱処理による組織の均質化と耐摩耗性の向上を示した論文が掲載されました。

Lei Wang, Masayuki Okugawa*, Yuheng Liu, Ken Cho, Yuichiro Koizumi*, Hiroyuki Y. Yasuda and Takayoshi Nakano:
Microstructural Evolution and Wear Resistance Enhancement of Electron-Beam-Fabricated Nickel Titanium Coatings on Titanium by Heat Treatment,
Materials Transactions, 67 (2026) 771-782.

DOI: https://doi.org/10.2320/matertrans.MT-M2025170

論文はこちら
PDFはこちら

Abstract
We previously proposed a novel method for fabricating NiTi coatings on pure Ti surfaces using electron-beam multi-track scanning to improve wear resistance. However, electron-beam scanning coatings exhibit spatial inhomogeneity in phase and elemental distributions, which is suggested to decrease wear resistance. In the present study, we investigated the effects of heat treatment on reducing inhomogeneity and improving the performance of the coatings. As a result, the homogeneity of the electron beam (EB) scanned coatings was significantly enhanced after annealing (900°C, 10 min), and then the Ni₄Ti₃ phase precipitated in the annealed EB-scanned coatings after aging (400°C, 60 min). The results of nanoindentation show that the hardness/indentation modulus (H/E) ratio and depth recovery ratio (η_d,h) of the Ti-rich EB-scanned coatings increased by 27% and 21%, respectively, after annealing and aging. The H/E ratio and η_d,h of the Ni-rich EB-scanned coating improved by 8% and 14%, respectively, after annealing and aging. The wear test results demonstrate that the wear rates of the two coatings decreased by 52% and 26% after annealing and aging, respectively, approaching the wear performance of bulk Nitinol.

keywords: commercially pure titanium; nickel titanium coating; heat treatment; mechanical properties; wear resistance

2026.04.24

【AM委員会】中野先生が委員長を務めた、経済産業省での金属ＡＭの普及拡大・活用促進に向けた検討会報告書が公開されました。

【公開先URL】
https://www.meti.go.jp/policy/mono_info_service/mono/sokeizai/AM-WG.html

★報告書＜概要版＞はこちら

★報告書はこちら

★参考資料集はこちら

 

過去の情報

1. 2026年 1月～6月 | 7月～12月
2. 2025年 1月～6月 | 7月～12月
3. 2024年 1月～6月 | 7月～12月
4. 2023年 1月～6月 | 7月～12月
5. 2022年 1月～6月 | 7月～12月
6. 2021年 1月～6月 | 7月～12月
7. 2020年 1月～6月 | 7月～12月
8. 2019年 1月～6月 | 7月～12月
9. 2018年 1月～6月 | 7月～12月
10. 2017年 1月～6月 | 7月～12月
11. 2016年 1月～6月 | 7月～12月
12. 2015年 1月～6月 | 7月～12月
13. 2014年 1月～6月 | 7月～12月
14. 2013年 1月～6月 | 7月～12月
15. 2012年 1月～6月 | 7月～12月
16. 2011年 1月～6月 | 7月～12月
17. 2010年 1月～6月 | 7月～12月
18. 2009年 1月～6月 | 7月～12月
19. 2008年 1月～6月 | 7月～12月