CoCrFeNiTi-based high-entropy alloy with superior tensile strength and corrosion resistance achieved by a combination of additive manufacturing using selective electron beam melting and solution treatment

Tadashi Fujieda, Hiroshi Shiratori, Kosuke Kuwabara, Mamoru Hirota, Takahiko Kato, Kenta Yamanaka, Yuichiro Koizumi, Akihiko Chiba, Seiichi Watanabe

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)

Abstract

We succeeded in fabricating a Co1.5CrFeNi1.5Ti0.5Mo0.1 high entropy alloy with superior tensile strength and corrosion resistance by a combination of additive manufacturing using selective electron beam melting (SEBM) and solution treatment (ST). The SEBM specimens exhibited superior tensile properties to those of the corresponding casting specimen. Furthermore, the tensile properties and corrosion properties of the SEBM specimens markedly improved by ST. These notable improvements are ascribed to homogeneous precipitation of very fine particulate ordering-phase particles whose diameters are several tens of nanometers with Ni and Ti concentrations. The solution-treated SEBM specimens also exhibited both high strength and high pitting potential, which in combination are superior to the conventional alloys used in severe corrosion environments.

Original languageEnglish
Pages (from-to)148-151
Number of pages4
JournalMaterials Letters
Volume189
DOIs
Publication statusPublished - 2017 Feb 15

Keywords

  • Additive manufacturing
  • High entropy alloys
  • Selective electron beam melting

ASJC Scopus subject areas

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

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