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非常に歪んだ超弾性化学的に複雑なエリンバル合金
Q F He1, J G Wang1,2, H A Chen3
1Department of Mechanical Engineering, City University of Hong Kong, Kowloon, Hong Kong, China.
Nature
|February 10, 2022
まとめ
研究者は新しい超弾性金属合金を開発しました. この新しい材料は,高い弾性ストレスの限界と,例外的な温度無感弾性モジュール (Elinvar効果) を示し,既存の合金よりも性能が優れています.
科学分野:
- 材料科学
- 金属工学
- 固体物理学
背景:
- 高性能の超弾性金属はアクチュエータ,医療機器,精密機器などの用途に不可欠です.
- 従来の金属は弾性 (<1%) が限られているが,形状記憶合金では,かなりのエネルギー消耗で擬似弾性がある.
- 高エントロピー合金を含む化学的に複雑な合金は,高度な材料特性を有することを示しています.
研究 の 目的:
- 化学的に複雑な新型合金を開発し 弾性特性を向上させる
- 新しい合金の弾性ストレスの限界,内部の摩擦,および温度依存の弾性モジュールを調査する.
- 高性能の用途に不適した大きな原子の合金の可能性を探求する.
主な方法:
- 化学的に複雑な合金の合成で,大きな原子のサイズが不適切です.
- 室温での合金の弾性ストレスの限界の実験的特徴付け.
- 室温での内部摩擦の測定
- 広範囲の温度 (室温から627°C) で弾性モジュールの評価.
主要な成果:
- 開発された合金は,約2%の高弾性ストレスの限界を達成しました.
- 室温では非常に低い内部摩擦 (2 × 10−4) が観察されました.
- この合金は,室温から627°Cまでほぼ恒常な弾性モジュールを保持して,異常なElinvar効果を示した.
結論:
- この新しい化学的複合物は 高い弾性ストレスの限界と 特殊なエリンヴァー効果の ユニークな組み合わせを備えています
- この材料は,温度感受性のない弾性モジュールで既存の合金を超えており,要求の高い用途に適しています.
- この発見は,優れた機械的性質を持つ先進的な金属材料を設計するための新しい道を開きます.
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