Randomized trial demonstrates enhanced hardness in high-entropy alloys, suggesting improved material properties for industrial applications.
In this study, two bulk high-entropy alloys, CoCrFeNiAl0.3 doped with Hf and CoCrFeNiAl0.3 doped with Hf and C, were prepared using the vacuum arc melting method. Both HEAs contain Co2Hf phases in the as-cast alloy. The heat treatment did not modify the main matrix phase, and the FCC structure was unchanged. After 10 h of solution treatment at 1210 °C and after 24 h of aging treatment at 800 °C, intergranular carbide Cr23C6 was found to precipitate in the alloys doped with Hf and C. This carbide has a very remarkable strengthening effect on the high-entropy alloy, reaching up to 224.64 HV under a load of 200 g.
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Zhou et al. (2026) studied this question.
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