A novel L12-strengthened AlCoCuFeNi high-entropy alloy with both high hardness and good corrosion resistance

Yaojia Ren, Hong Wu, Bin Liu, Quan Shan, Sheng Guo, Zengbao Jiao, Ian Baker

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

In this work, a high hardness, crack-free AlCoCuFeNi high-entropy alloy with good corrosion resistance was successfully produced by spark plasma sintering at 1000℃ and 30 MPa for 10 min, followed by hot rolling to a thickness reduction of 10 % after holding at 600℃ for 30 min. The microstructure of the alloy was composed of fine equiaxed grains of (Fe, Co, Ni, Al)-enriched BCC, Cu-enriched FCC, nano-sized L12, and Al2O3 phases. The maximum texture index of the material is only 1.53, indicating a low anisotropy. The alloy possessed a high hardness (599 HV), a low friction coefficient (0.1), and a low corrosion current density (1.13 μA/cm2), implying both good wear and corrosion resistance. In addition, the creep mechanism was found to be grain boundary sliding.

Original languageEnglish
Article number133339
JournalMaterials Letters
Volume331
DOIs
Publication statusPublished - 15 Jan 2023

Keywords

  • Corrosion resistance
  • High entropy alloy
  • Microstructure
  • Nanomechanics
  • Segregation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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