Influence of heat-treated temperature and its rate on structural, mechanical, and corrosion properties of (Ti-Mo-Zr)60CoXCrY high entropy alloys for lightweight applications

Multi-component (Ti, Mo, Zr, Co, and Cr) high-entropy alloys (HEAs) are prepared are via high energy ball milling technique and followed by spark plasma sintering (SPS) technique for their compaction using the general formula (Ti-Mo-Zr)60CoxCry labeled as (TMZ)60CoxCry where x & y as at.%; equiatomic (X/Y = 20/20) and non-equiatomic (X/Y = 40/00,30/10,10/30,and 00/40); stoichiometric ratios of Ti, Mo, Zr elements). XRD traces recorded the presence of FCC and BCC solid solution phases, at 20 h of milling schedule and stability of as precipitated phases are analyzed using DSC profiles. Mechanical properties include maximum load (19.06 kN), compressive strength (σmax: 205 MPa), Young's Modulus (E: 57.88 GPa), and Vickers's hardness (166HV) are achieved to be maximum for equiatomic (TMZ)60Co20Cr20 HEA pellet (rate of heat treatment: 125°C/min), compared with all other compositions under investigation. The superior corrosion properties such as corrosion current density (ic), passive current density (ip), corrosion potential (Ec), and passive potential (Ep) of obtained equiatomic (TMZ)60Co20Cr20 HEA pellet made this family of network a potential candidate for use in lightweight vehicle applications.