High Entropy Alloys

High Entropy Alloys (HEA) are multicomponents metallic alloys showing simple phase composition – fcc and bcc solid solutions or their mixture. Large value of configurational entropy due to the presence of many elements, results in promotion of solid solutions formation instead of intermetallic compounds. At the stage of HEA designing, besides entropy, other parameters are considered, like enthalpy of mixing, differences in atomic radii, melting temperature of the elements and VEC, parameter depending on the number of valance electrons of the elements. Due to variety of available chemical compositions of the alloys, various properties are reported, resulting in broad application possibilities, like tool materials, biomaterials, alloys for nuclear industry or high temperature applications. HEA can serve as a metallic matrix for composites and can be reinforced by precipitation hardening (intermetallic compounds). Their heat treatment can be combined with plastic deformation.
 

Research activities

• High melting alloys (Refractory HEA)
• HEA of INCONEL-type
• Bio-HEA
• HEA with soft/hard magnetic properties
• Precipitation hardened HEA
• High Entropy Intermetallics
   

Research offer

• Fabrication of HEA by arc melting/induction melting and casting
• Fabrication of HEA by mechanical alloying and powder compaction
• Phase composition studies
• Microstructure characterization
• Chemical composition analysis
• Thermal stability, density determination
• Magnetic and mechanical properties measurements
• Designing of HEA using Thermo-Calc and Calphad software
   

Projects

• Multicomponent high entropy alloys, NCN 2012-2015 OPUS, UMO-2012/05/B/ST5/00747
• High temperature high entropy alloys with enhanced plasticity and corrosion resistance, NCN, MINIATURA, 2019-2020
   

Research collaboration

• Cracow University of Science and Technology, Poland
• Łukasiewicz Institute of Electronic Materials Technology, Poland
• Łukasiewicz Metal Forming Institute, Poland
• Institute of High Pressure, Polish Academy of Sciences
• Erich Schmid Institute of Materials Science, University of Leoben, Austria
   

Contact

Professor Dariusz Oleszak
dariusz.oleszak@pw.edu.pl
+48 22 234 84 08, +48 22 848 06 34
Division of Structural and Functional Materials

Professor Tadeusz Kulik
tadeusz.kulik@pw.edu.pl
+48 22 234 8719
Division of Structural and Functional Materials