微重力下での液体Vit106aの熱物理的特性と固化特性

Damien Terebenec¹, Markus Mohr^2,3, Rainer Wunderlich^3,4

¹Center for X-ray Analytics, Empa Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland. Damien.terebenec@empa.ch.

NPJ microgravity

|February 17, 2026

まとめ

研究者は,国際宇宙ステーションを使用して,液体Vit106a金属ガラスの熱物理的性質を測定しました.

科学分野:

マテリアルサイエンス材料科学
熱力学は熱力学である.
固体物理固体物理学

背景:

バルク金属ガラス (BMG) 結晶化には,正確な熱物理的性質が不可欠である.
表面張力や粘度などの温度に依存する性質を理解することは,BMG処理の鍵です.

研究の目的:

微重力を用いて,液体Vit106aの熱物理的性質を測定する.
表面張力と粘性の温度依存性を分析する.
Vit106aの急速冷却下での結晶化行動を調査するために.

主な方法:

国際宇宙ステーション (ISS) で実施された実験は,電磁浮揚器 (EML) を使用した.
表面張力 (σ) と粘度 (η) を温度に応じて測定する.
サンプルの結晶化を決定するX線 difraktion (XRD) 分析.

主要な成果:

表面張力 (σ) は温度の弱い依存を示した: σ (T) = 1.557 - 4.36 × 10−5 × (T - 1106) N·m−1.1.
Vogel-Fulcher-Tammann (VFT) 方程式を用いた粘度 (η) 分析は,脆弱から強いへの移行 (D* = 9.8 高 T,D* = 21.6 低 T) を明らかにした.
16 K·s−1 で冷却したにもかかわらず,試料は完全に二重金属間フェーズに結晶し,1.75 K·s−1.1 の臨界冷却速度と矛盾しました.

結論:

この研究は,Vit106aの重要な熱物理データを提供し,大規模な製造を支援しています.
急速冷却下で観察された結晶化は,より厚い鋳造品に対する Vit106a の既知のガラス形成能力に異議を唱える.
発見は,BMGの熱物理的特性,冷却速度,ガラス形成の複雑な相互作用を強調しています.

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