【公開日：2024.07.25】【最終更新日：2024.06.22】

課題データ / Project Data

課題番号 / Project Issue Number

23NU0014

利用課題名 / Title

低密度高硬度ハイエントロピー合金の研究

利用した実施機関 / Support Institute

名古屋大学 / Nagoya Univ.

機関外・機関内の利用 / External or Internal Use

内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)

技術領域 / Technology Area

【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-

【重要技術領域 / Important Technology Area】（主 / Main）革新的なエネルギー変換を可能とするマテリアル/Materials enabling innovative energy conversion（副 / Sub）-

キーワード / Keywords

低密度, 高硬度, 微細構造, ハイエントロピー合金,燃料電池/ Fuel cell,太陽電池/ Solar cell,電子顕微鏡/ Electronic microscope,電子回折/ Electron diffraction

利用者と利用形態 / User and Support Type

利用者名（課題申請者）/ User Name (Project Applicant)

澤田 康之

所属名 / Affiliation

名古屋大学大学院工学研究科

共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes

イ-スルギ,チャヤナパット チョクラジャロエン,齋藤 永宏

ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes

樋口公孝

利用形態 / Support Type

（主 / Main）技術代行/Technology Substitution（副 / Sub）-

利用した主な設備 / Equipment Used in This Project

NU-102：高分解能電子状態計測走査透過型電子顕微鏡システム

報告書データ / Report

概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)

The crystal structure of phase and defects (dislocations, twins) in the AlTiCuCo and AlTiCuCoV alloy have been analyzed using TEM for a deep understanding of the microstructure and mechanical properties of multi-element alloys. The focused ion beam (FIB) work was performed for preparing samples for transmission electron microscope (TEM) investigation.

実験 / Experimental

The equiatomic of Al, Ti, Cu, Co and V were mixed and mechanically alloyed using high energy planetary ball milling (Pulverisette 7, Fritsch, Germany). The total milling time was 7 hours, and then powder mixtures were compacted using spark plasma sintering (SPS-211LX, Fuji Electronic Industrial Co. Ltd., Japan) under high vacuum condition (5 x 10^-3 Pa). The sintering temperature was 900 °C and 30 MPa pressure was applied with 3 minutes of the holding time.

結果と考察 / Results and Discussion

The final microstructure of the AlTiCuCo alloy consists of bcc based L2₁ phase of AlCo₂Ti and martensitic AlCu₃ β₁' phase in the AlTiCuCo system. In addition, the microstructure of the AlTiCuCoV alloy was also having bcc based L2₁ phase of AlCu₂Ti and V rich phase. The phase structure identified using TEM observation as shown in Fig. 1. The fine and uniform distribution of the ordered L2₁ Huesler phase in the multicomponent alloy system led to high hardness properties. In this work, the L2₁ phase plays a key role in the excellent mechanical property of AlTi containing high-entropy alloys.

図・表・数式 / Figures, Tables and Equations

Fig1. TEM images of AlCo2Ti L21 phase in the AlTiCuCo alloy; (a) bright-field TEM image, (b) diffraction pattern taken under the [0 1- 1] zone axis, TEM images of AlCu2Ti L21 phase in the AlTiCuCoV alloy; (c) bright-field TEM image, (d) diffraction pattern taken under the [0 0 1] zone axis

その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)

We are grateful to Mr K. Higuchi for technical assistance with TEM and FIB experiments.

成果発表・成果利用 / Publication and Patents

論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)

口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.

特許 / Patents

特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件