Phase equilibria study and mechanical properties of multicomponent alloys

Abstract

Multicomponent alloys have been attracting attention worldwide and constitute an active, frontier area of research in the exploration of novel materials development. The current thesis focuses to design and development of multicomponent alloys Al-Ni-X (X = Fe, Cr, Co, V, Ta, Si ), Al-Cu-X (X = Si, Ni), Single phase Fe-Co-Ni-Cr-V-X (X = 0, Al) HEAs and Fe-Co-Ni-Cr-V-Al-TaX (X = 2.5%, 5%, 7.5% and 10%) EHEAs to establish new phase equilibria using integrated approach by combining thermodynamic simulation, numerical simulation and experimental solidification techniques for the development of novel materials for better mechanical properties and high temperature applications. A numerical simulation model is successfully developed for vacuum arc melting cum suction casting unit by using ANSYS Fluent software and validated in a well manner. Experimentally, it is found that the microstructure of studied multicomponent alloys consist of FCC solid solution phase and one or more intermetallic phases. The mechanical properties of multicomponent alloys are carried out at room temperature as well as at elevated temperatures. It is to be noted that high strength and plasticity are attributed to the synergic effects of eutectics of different morphologies.