Abstract

A feature of a new class of materials-high-entropic alloys - is the presence of atoms with different properties and the absence of a dominant element and in accordance with the law of self-organisation this should lead to the appearance of new dependences characteristic only for high-entropic alloys. Identification of new dependences inherent to high-entropy alloys is one of the important in the study of high-entropy alloys. Analyses of single-phase high-entropy alloys have revealed that the lattice parameter depends significantly on the electron concentration. In the range of electron concentration up to 7,3el/at, alloys with BCC crystal lattice are formed. High-entropy alloys with FCC crystal lattice are formed at electron concentration higher than 7,8el/at. It is also revealed that for these alloys the shift of the enthalpy of mixing towards negative values is accompanied by a decrease in the lattice parameter. It is revealed that in the presence of positive enthalpy of mixing in single-phase high-entropy alloys, the determined lattice parameter will always be greater than the calculated one. And only at total negative enthalpy of mixing and the presence of a pair with negative enthalpy of mixing above -40kJ/mol in such alloys the determined lattice parameter is less than the calculated one. The peculiarities of single-phase high-entropy alloys include the dependence of the elastic modulus on the lattice parameter.

Keywords:High-entropy alloys; Electron concentration; Hardness; Elastic modulus; Lattice parameter; Enthalpy of mixing