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

The present work describes the influence of Al content on the CoCrFeNiAl high-entropy alloys prepared by the powder metallurgy technique. The preparation procedure consisted of mechanical alloying 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 grain refined with increasing content of Al accompanied by the annihilation of the ductile FCC solid solution (Cr 0.25 Fe 0.25 Co 0.25 Ni 0.25 ) 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.

[1]  F. Průša,et al.  Partial Substitution of Mn by Al in the Cocrfenimnxal20-X (X=5, 10, 15) High Entropy Alloy Prepared of Mechanical Alloying and Spark Plasma Sintering , 2022, Manufacturing Technology.

[2]  Liang Zhao,et al.  First Principles Investigation of Binary Chromium Carbides Cr7C3, Cr3C2 and Cr23C6: Electronic Structures, Mechanical Properties and Thermodynamic Properties under Pressure , 2022, Materials.

[3]  D. Vojtěch,et al.  Microstructural characterization and optimization of the ZnMg0.8(CaO)0.26 alloy processed by ball milling and subsequent extrusion , 2020 .

[4]  Vinuthaa Murthy,et al.  Structural and electronic properties of chromium carbides and Fe-substituted chromium carbides , 2020, Materials Research Express.

[5]  B. S. Murty,et al.  Influence of Al content on thermal stability of nanocrystalline AlxCoCrFeNi high entropy alloys at low and intermediate temperatures , 2020 .

[6]  J. Torralba,et al.  High-entropy alloys fabricated via powder metallurgy. A critical review , 2019, Powder Metallurgy.

[7]  B. S. Murty,et al.  High-entropy alloys by mechanical alloying: A review , 2019, Journal of Materials Research.

[8]  Bin Yang,et al.  Homogenization of AlxCoCrFeNi high-entropy alloys with improved corrosion resistance , 2018 .

[9]  Cong-qian Cheng,et al.  The influence of Al elements on the structure and the creep behavior of AlxCoCrFeNi high entropy alloys , 2016 .

[10]  Yong Zhang,et al.  Effects of AL addition on microstructure and mechanical properties of AlxCoCrFeNi High-entropy alloy , 2015 .

[11]  Sheng Guo,et al.  Phase selection rules for cast high entropy alloys: an overview , 2015 .

[12]  Yong Zhang,et al.  Phase Stability of Low-Density, Multiprincipal Component Alloys Containing Aluminum, Magnesium, and Lithium , 2014 .

[13]  K. Dahmen,et al.  Microstructures and properties of high-entropy alloys , 2014 .

[14]  J. Yeh,et al.  Phases, microstructure and mechanical properties of AlxCoCrFeNi high-entropy alloys at elevated temperatures , 2014 .

[15]  J. Yeh,et al.  Effects of Al addition on the microstructure and mechanical property of AlxCoCrFeNi high-entropy alloys , 2012 .

[16]  J. Yeh,et al.  Electrical, magnetic, and Hall properties of AlxCoCrFeNi high-entropy alloys , 2011 .

[17]  B. Cantor,et al.  Microstructural development in equiatomic multicomponent alloys , 2004 .

[18]  T. Shun,et al.  Nanostructured High‐Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes , 2004 .

[19]  张勇.  Effects of AL addition on microstructure and mechanical properties of AlxCoCrFeNi High-entropy alloy , 2015 .