Oxidation Behavior of a Refractory NbCrMo0.5Ta0.5TiZr Alloy

Abstract

Isothermal oxidation behavior of a refractory high-entropy NbCrMo0 5Ta0 5TiZr alloy was studied during heating at 1273 K for 100 h in flowing air. Continuous weight gain occurred during oxidation, and the time dependence of the weight gain per unit surface area was described by a parabolic dependence with the time exponent n = 0.6. X-ray diffraction and scanning electron microscopy accompanied by energy-dispersive X-ray spectroscopy showed that the continuous oxide scale was made of complex oxides and only local (on the submicron levels) redistribution of the alloying elements occurred during oxidation. The alloy has a better combination of mechanical properties and oxidation resistance than commercial Nb alloys and earlier reported developmental Nb Si Al Ti and Nb Si Mo alloys.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 2014
Accession Number
ADA621996

Entities

People

  • Christopher F. Woodward
  • Daniel Miracle
  • Dennis M. Dimiduk
  • Oleg N. Senkov
  • S. V. Senkova

Organizations

  • Air Force Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Body Weight
  • Chemistry
  • Crystal Structure
  • Diffraction
  • Electron Microscopy
  • Materials
  • Mechanical Properties
  • Oxidation
  • Oxidation Resistance
  • Oxides
  • Resistance
  • Scanning Electron Microscopy
  • Turbines
  • X Rays
  • X-Ray Diffraction

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics