Manufacturing Technology 2022, 22(4):471-476 | DOI: 10.21062/mft.2022.059

Phase and Mechanical Properties Response of the Mechanically Alloyed CoCrFeNiAlX High Entropy Alloys

Angelina Strakosova ORCID..., Petr Kratochvíl ORCID..., Jan Riedl ORCID..., Filip Průša ORCID...
Department of Metals and Corrosion Engineering, University of Chemistry and Technology Prague. Technická 5, 166 28 Prague 6. Czech Republic

The present work describes the influence of Al content on the CoCrFeNiAl high-entropy alloys pre-pared by the powder metallurgy technique. The preparation procedure consisted of mechanical alloy-ing and subsequent spark plasma sintering. The content of Al varied from 10 – 30 at.% which affected the microstructure and mechanical properties. Using scanning electron microscope (SEM) and X-ray diffraction analysis (XRD) was found the microstructure becomes more refined with increasing con-tent of Al accompanied by the annihilation of the ductile FCC solid solution (Cr0.25Fe0.25Co0.25Ni0.25) phase and growth of the brittle and hard BCC solid solution phase (α-Fe) and formation of Al(Co0.5Ni0.5) phases, improving the mechanical properties. The best combination of the porosity, hardness HV 30, and ultimate compressive strength (UCS) was achieved for the studied high-entropy alloy when it contained 20 at. % Al.

Keywords: High-Entropy Alloy, Mechanical Alloying, Spark Plasma Sintering, Mechanical Properties, Microstructure
Grants and funding:

The research was financially supported by Czech Science Foundation (grant No. 21-11313S)

Received: July 14, 2022; Revised: October 4, 2022; Accepted: October 5, 2022; Prepublished online: October 6, 2022; Published: October 17, 2022  Show citation

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Strakosova A, Kratochvíl P, Riedl J, Průša F. Phase and Mechanical Properties Response of the Mechanically Alloyed CoCrFeNiAlX High Entropy Alloys. Manufacturing Technology. 2022;22(4):471-476. doi: 10.21062/mft.2022.059.
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