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付加的に製造されたユーテクティック高エントロピー合金における微細構造の解き放たれ選択

Shengbiao Zhang¹, Chenyang Li², Shahryar Mooraj¹

¹Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, MA, 01003, USA.

Advanced materials (Deerfield Beach, Fla.)

|August 28, 2025

まとめ

高エントロピー合金 (HEAs) の添加製造 (AM) は,マイクロ構造の制御を可能にします. AlCrFe2Ni2 HEAsのAM中の固化速度の増加は固化モードをシフトさせ,特性を変化させ,マテリアル設計を可能にします.

科学分野:

材料科学
金属工学
アディティブ製造

背景:

高エントロピー合金 (HEA) は,構造用途の優れた機械性能を示しています.
アディティブ製造 (AM) は,急速な固化により,ユニークな非均衡の微細構造を作り出します.
AM処理,HEAの微細構造,および特性の相互作用を理解することは極めて重要です.

研究の目的:

固化速度の微細構造の進化と相変換の影響をレーザー添加で製造されたAlCrFe2Ni2HEAsで調査する.
激光スキャンの速度の変化が固化モードと結果として生じる材料の性質にどのように影響するか調べる.
不均衡条件下にある高熱エネルギーにおける固化メカニズムについて,多次元的な理解を図る.

主な方法:

異なるスキャン速度でAlCrFe2Ni2HEAsのレーザー添加製造.
固化モード (結合エウテクティック,異常エウテクティック,単相) を特定するための微細構造の特徴化.
原子拡散とインターフェースの安定性を明らかにするための熱力学モデリングと分子動力学シミュレーション.

主要な成果:

固化速度の上昇 (レーザースキャンの速度による) は,結合されたエウテクティックから異常なエウテクティック,そして単相に移行する.
これらの移行により,明確な微細構造と幅広い機械的性質が達成されます.
低冷却率は拡散と結合したエウテクティック成長を促進し,急速な冷却は拡散を抑制し,異常または単相固化を促進する.

結論:

AMでの急速な固化中の運動効果は,HEAsの熱力学的予測を覆すことができます.
添加材料製造は HEAを設計するための強力な経路を提供し, 適した微細構造と特性を備えています.
この研究は,AMによって生成されたHEAsの固化メカニズムに関する基本的な洞察を提供します.

キーワード:

アディティブ製造原子のシミュレーション高エントロピー合金段階変換熱力学モデリング

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