Investigation of Microstructure of Pressed and Sintered TiZrNbCrV, TiZrNbFeCr, and TiZrNbFeV High Entropy Alloys Produced by Powder Metallurgy and Mechanical Alloying Methods

A system of components containing three refractory elements, namely titanium, niobium, and zirconium, in combination with iron, chromium, and vanadium was studied for the purpose of manufacturing a cost-effective bio-high entropy alloy (HEA). The following three high-performance alloys were synthesized: TiZrNbCrV, TiZrNbFeCr, and TiZrNbFeV. The alloys were fabricated by employing a mechanical alloying method. The obtained powders were compacted at 2000 MPa and then sintered in argon and hydrogen atmosphere at 1150°C for 1 hour at a heating rate of 10 K/min. The structure and phase composition of the alloys were studied using an x-ray diffraction (XRD) analysis and field emission scanning electron microscopy (FE-SEM). The structure of all alloys included the following four regions: BCC phase (primary), HCP phase (small quantity), void space, and Nb (non-diffusion region).