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熱処理されたLPBF NiTi形状記憶合金の機械的反応と機能性能
Jerzy Ratajski1, Błażej Bałasz1, Agnieszka Peła1
1Faculty of Mechanical and Power Engineering, Koszalin University of Technology, 75-453 Koszalin, Poland.
Materials (Basel, Switzerland)
|February 13, 2026
まとめ
溶液処理と老化は,レーザー粉末床融合 (LPBF) によって生成されたNiTi合金性能を大幅に変化させます. これらの処理は,変形メカニズムと相変換を制御し,さまざまなアプリケーションに合わせた機能特性を可能にします.
科学分野:
- マテリアルサイエンス 材料科学
- メタルルジーは,金属の製造業です.
- アディティブ製造 アディティブ製造
背景:
- ニッケル・チタニウム (NiTi) 合金は,形状記憶と超弾性を必要とするアプリケーションに不可欠です.
- レーザー粉末床融合 (LPBF) は,複雑なNiTiコンポーネントを製造するための新しい経路を提供します.
- LPBF NiTiに対するポスト処理効果を理解することは,パフォーマンスの最適化に不可欠です.
研究 の 目的:
- LPBFで製造されたNiTi合金に対する溶液処理と老化の影響を調査する.
- 微細構造の進化と相変化を機械的行動と相関させる.
- LPBF NiTiを特定の機能アプリケーションに合わせるための枠組みを確立する.
主な方法:
- 室温 (RT) と低温 (LT) での牽引性試験.
- 熱力学分析のための微分スキャニング熱計 (DSC).
- 微細構造の特徴化のためのX線 difrraction (XRD) と伝送電子顕微鏡 (TEM).
主要な成果:
- As-fabricated (AF) NiTiは,抑制されたストレス誘発マルテンサイト (SIM) との結合とマルテンサイト性可塑性を表しています.
- 溶液処理 (ST) は,可逆性SIMと部分回復性を復元します.
- 老化 (A1h,A20h) はNi4Ti3の降水を引き起こし,マルテンサイトを安定させ,不可逆的な変形を引き起こします.
結論:
- 復元から消耗性および不可逆的な行動までの機能的連続は,ポスト処理に基づいて実証されています.
- 溶液処理と老化による微細構造制御は,LPBFのNiTi特性を調整する鍵です.
- この研究は,アクチュエータおよびエネルギー管理システムのためのNiTiコンポーネントの設計のためのメカニズム的な理解を提供します.
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