Effects of the sp element additions on the microstructure and mechanical properties of NiCoFeCr based high entropy alloys

Adam Vida, Lajos K. Varga, Nguyen Quang Chinh, David Molnar, Shuo Huang, Levente Vitos

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The effects of the sp (Al, Ga, Ge, Sn) element additions on the microstructure and mechanical properties of equimolar NiCoFeCr High Entropy Alloys (HEAs) are investigated. The results of X-ray diffraction measurements combined with scanning electron microscopy SEM investigations, as well as the results of nanoindentation test revealed that while the structure of the basic alloy is full FCC, the addition of sp elements has changed it to a multiphase containing both FCC and BCC components, but in different scales. Accordingly, the addition of sp elements strongly increases the strength of the basic state, especially in the case of alloys where the BCC phase is dominant in the microstructure.The physical properties as the Young's- and shear moduli of the investigated HEAs were also determined using ultrasound methods. The correlation between these two moduli suggests a general relationship for metallic alloys.

Original languageEnglish
Pages (from-to)14-19
Number of pages6
JournalMaterials Science and Engineering A
Volume669
DOIs
Publication statusPublished - Jul 4 2016

Keywords

  • High entropy alloys
  • High strength
  • Mechanical properties
  • Multiphase materials

ASJC Scopus subject areas

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

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