Abstract
In this study, the effects of Al addition on the microstructure and hardness of CoCrFeNi3 high entropy alloy prepared by direct energy deposition (DED) were investigated. As Al content increased, the structure of alloy transformed from a face-centered cubic (FCC)-based crystal structure (including the ordered L12 phase) into a duplex FCC coexisting with body-centered cubic (BCC) structure. Besides, eutectic precipitations appeared when Al content in the alloy exceeded 12.5%. The increase in hardness of the alloy was mostly attributed to the solid solution hardening and precipitation hardening.
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