High Entropy Alloys (HEA) are multicomponent metallic alloys consisting of at least 5 elements in equimolar or near equimolar proportions, showing simple phase composition and unique properties.
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.
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