Formation of Structure and Phase Composition in Ecviatomic Alloys of Cu–Ni–Al–Fе–Cr System Synthesized by Mechanical Alloying

Authors

  • Олександра Іванівна Юркова NTUU KPI,
  • Вадим Вікторович Чернявський NTUU KPI,
  • Олександра Ігорівна Кравченко NTUU KPI,
  • Богдан Анатолійович Кальян NTUU KPI,

DOI:

https://doi.org/10.20535/1810-0546.2014.5.35370

Keywords:

High entropy alloys, Mechanical alloying, X-ray diffraction, Structure, Phase composition, Diffusion

Abstract

Nanocrystalline equiatomic high-entropy alloys (HEAs) have been synthesized by mechanical alloying in Cu–Ni–Al–Fе–Cr system from the binary CuNi alloy to the quinary CuNiAlFeCr alloy. By using X-ray diffraction analysis structure and phase evolution during mechanical alloying (MA) in binary to quinary alloys selected from Cu, Ni, Al, Fe и Cr in sequence were investigated. Binary CuNi alloy formed solid solution with face-centered cubic  crystal structure in nanocrystalline state. Ternary to quinary alloys (CuNiAl, CuNiAlFe CuNiAlFeCr) first formed solid solution with body-centered cubic crystal structure in nanocrystalline state and then transformed into XRD-amorphous phase at the end of MA. No precipitation of the second phase such as intermetallic phase was found. The alloying sequence for the present alloy system during MA is determined as Cu→Ni→Al→Fe→Cr in the order of decreasing alloying rate. The alloying rate is found to correlate with the melting temperature of the elements. This correlation is explained through the effect of melting temperature on solid diffusion.

Author Biographies

Олександра Іванівна Юркова, NTUU KPI

Doctor of engineering, full professor, professor at the NTUU KPI

Вадим Вікторович Чернявський, NTUU KPI

Postgraduate student

Олександра Ігорівна Кравченко, NTUU KPI

Student

Богдан Анатолійович Кальян, NTUU KPI

Student

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Published

2014-11-19

Issue

No. 5 (2014): Engineering

Section

Art

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