Refractory High-Entropy Alloys (Postprint)

Abstract

Two refractory high-entropy alloys with near-equiatomic concentrations, W-Nb-Mo-Ta and W-Nb-Mo-Ta-V, were produced by vacuum arc melting. Despite containing many constituents both alloys have a single-phase body-centered cubic (BCC) structure. The lattice parameters a = 3.2134(3) A for the quaternary alloy and a = 3.1832(2) A for the quinternary alloy were determined with high-energy X-ray diffraction using a scattering vector length range from 0.7 to 20 A-1. The alloy density and Vickers microhardness were rho = 13.75 g/cm3 and Hv = 4455 MPa for the W-Nb-Mo-Ta alloy and rho = 12.36 g/cm3 and Hv = 5250 MPa for the W-Nb-Mo-Ta-V alloy. The exceptional microhardness in these alloys is greater than any individual constituent, suggesting the operation of a solid-solution-like strengthening mechanism.

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Document Details

Document Type
Technical Report
Publication Date
Jun 23, 2010
Accession Number
ADA620902

Entities

People

  • C. P. Chuang
  • Daniel Miracle
  • G. B. Wilks
  • Oleg N. Senkov
  • P. K. Liaw

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Alloys
  • Arc Melting
  • Crystal Lattices
  • Crystal Structure
  • Diffraction
  • Electron Microscopy
  • Hardness
  • Materials
  • Mechanical Properties
  • Microhardness
  • Scattering
  • Solid Solutions
  • Tensile Strength
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Nuclear Civil Defense.