Nanostructured High Entropy Alloys

Abstract

The objective of this research program was to establish a fundamental framework that can be used to advance our knowledge of nanostructured high entropy alloy (HEA) materials and their processing, microstructure and performance. This program was conducted via a synergistic approach involving materials synthesis and processing, microstructural and mechanical behavior studies. Through the performance period (September 10, 2014 July 31, 2016), the following studies were conducted: (1) A medium entropy alloy AlCoNiFe was selected for systematic studies of Ti additions and the influence of materials processing/synthesis on microstructural evolution and mechanical behavior. (2) An AlNiFeCrCo HEA was investigated to understand the influence of Co and materials processing/synthesis techniques on microstructural evolution and mechanical behavior. (3) An equiatomic CoNiFeAlTi HEA was synthesized and the effect of high atomic concentration of Ti and Al on the microstructure, phase transformations and mechanical behavior was studied. (4) Phase transformations, microstructure and strengthening mechanisms in a near-equiatomic CoNiFeAlCu HEA were investigated. (5) The influence of Cr on alloying behavior, microstructure and mechanical behavior of an AlTiCoNiFeCr HEA was studied. (6) Fabrication of ingot AlCoCrCuFeNi HEA was carried out. (7) High pressure torsion processing of AlCoCrCuFeNi HEA was applied to investigate the effects of grain refinement on mechanical behavior of HEAs. (8) Synthesis and processing of nanocrystalline AlCoCrCuFeNi HEA via gas atomization, cryomilling and spark plasma sintering (SPS) was explored. (9) Investigation of microstructure and mechanical behavior of a precipitation-hardened Fe27Ni27Co26Cu10Ti10 HEA. (10) Thermal stability and mechanical behavior of a single phased Fe27Ni27Co26Cu10Mn10 HEA.

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Document Details

Document Type
Technical Report
Publication Date
Aug 25, 2016
Accession Number
AD1099979

Entities

People

  • Enrique J. Lavernia

Organizations

  • University of California, Davis

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Chemical Analysis
  • Crystal Structure
  • Diffraction
  • Engineering
  • Grain Size
  • Hardness
  • High Pressure
  • Materials
  • Materials Engineering
  • Materials Processing
  • Materials Science
  • Mechanical Properties
  • Mechanical Working
  • Phase Transformations
  • Plastic Deformation
  • Powder Metallurgy
  • Scattering
  • Scientists
  • Solid Solutions
  • Stress Strain Relations
  • Stresses
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Powder metallurgy of Titanium alloys.

Technology Areas

  • Microelectronics