Microstructure and Room Temperature Properties of a High-Entropy TaNbHfZrTi Alloy (Preprint)

Abstract

A refractory alloy, Ta20Nb20Hf20Zr20Ti20, was produced by vacuum arc-melting. The as-solidified alloy had a dendritic structure, which was not affected by hot isostatic pressing (HI Ping) conducted at T = 1200 deg C and p = 207 MPa for 3 hours. The alloy had a single-phase body-centered cubic (BCC) structure with the lattice parameter a= 340.44 pm. The alloy density and Vickers microhardness after HIPing were p = 9.94 g/cm3 and Hv = 3826 MPa. Room temperature compression testing of HIPd samples revealed excellent ductility. The samples deformed homogeneously without any evidence of cracking at least up to 50% compression strain. Continuous strengthening followed yielding at 807 MPa. A simple model of solid-solution strengthening is proposed to explain the behavior.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2011
Accession Number
ADA550822

Entities

People

  • C. F. Woodward
  • Daniel Miracle
  • J. M. Scott
  • Oleg N. Senkov
  • S. V. Senkova

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Arc Melting
  • Compression
  • Crystal Lattices
  • Crystal Structure
  • Crystals
  • Diffraction
  • Distortion
  • Ductility
  • Hardness
  • Materials
  • Mechanical Properties
  • Microhardness
  • Microstructure
  • Solid Solutions
  • X Rays

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.