Unusual Thermal Stability of High-Entropy Alloy Amorphous Structure

Abstract

NbSiTaTiZr alloy was designed to have two combined effects: high entropy effect and large atomic size effect which are intended to give unusual thermal stability of amorphous structure. The outcome is that the amorphous structure of deposited alloy film on sapphire substrate can be retained even annealed at 850 ?C for at least 3 h. If substrate effect could be eliminated, the crystallization temperature would be higher.

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Document Details

Document Type
Technical Report
Publication Date
Jun 20, 2012
Accession Number
ADA563716

Entities

People

  • Jien-wei Yeh

Organizations

  • National Tsing Hua University

Tags

DTIC Thesaurus Topics

  • Advanced Materials
  • Chemical Reactions
  • Corrosion Resistance
  • Crystallization
  • Engineering
  • Films
  • High Resolution
  • Materials
  • Materials Science
  • Physical Properties
  • Resistance
  • Substrates
  • Surface Roughness
  • Thermal Properties
  • Thermal Stability
  • Thin Films
  • Transition Temperature

Readers

  • Powder metallurgy of Titanium alloys.
  • Thin Film Deposition Science.