マルチモードモデリングで設計された低ヒステリシス形状記憶セラミック

Edward L Pang¹, Gregory B Olson¹, Christopher A Schuh²

¹Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.

Nature

|October 5, 2022

まとめ

研究者は高温形状メモリアプリケーションのためにジルコニアセラミクスを設計しました. この高度なセラミクスを要求の高い用途に適したものにしました

科学分野:

材料科学
セラミック・エンジニアリング
フェーズ変換

背景:

ジルコニアセラミックは,高温形状記憶および超弾性アプリケーションのための大きなストレインを可能にするマルテンシット相変換を有しています.
合金化によりマルテンシート材料のヒステリシスが減るが,ジルコニアは体積変化と運動的障壁により課題となる.

研究の目的:

ジルコニアマーテンサイト設計における格子工学を拡張する方法を開発する.
ボリューム変化や変換温度管理などの物理的な制約に対処するためです.
新しい多成分ジルコニア組成物を設計するために,計算熱力学とデータ科学を利用する.

主な方法:

マルテンサイト設計のための拡張格子エンジニアリングアプローチ.
計算熱力学とデータサイエンスツールの応用
複雑でデータに乏しい多要素空間を探索する.

主要な成果:

低ヒステリシス (15 K) の新ジルコニア組成物が開発された.
このヒステレシスは,典型的な値より約10倍,以前報告されたベスト値より5倍低い.
達成されたヒステリシスは,広範囲に展開されている形状記憶合金に匹敵する.

結論:

開発された方法は,ジルコニアの格子工学の制約をうまく対処しています.
新しいジルコニア組成は,高温形状記憶材料としての可能性を示しています.
この突破は極端な環境での高度なセラミックアプリケーションの道を切り開きます

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