Impact of Al and Ti as Alloying Element in CoCrFeMnNi High Entropy Alloy on Mechanical Properties

The Cantor alloy has emerged as one of the most promising alloy systems in recent years, distinguishing itself as a high-entropy alloy (HEA) with exceptional ductility and fracture toughness. This study focuses on equiatomic CoCrFeMnNi, CoCrFeMnNiAl, and CoCrFeMnNiTi HEA, aiming to explore the impact of aluminium (Al) and titanium (Ti) as an alloying element on their structure. These HEAs were fabricated using casting techniques, and their phase transformation was analyzed through X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Hardness values were determined via Vickers hardness tests. The findings reveal that Al and Ti significantly influence the solidification process and grain growth kinetics of the alloy. These alterations in microstructure contribute to a notable enhancement in hardness, increasing from 1.8 GPa to 4.9 GPa and 9.3 GPa respectively. This improvement primarily stems from phase transformation of FCC to BCC structure. © 2024 The Authors.