Equiatomic FeCoCrNi (Zr 0 ) and non-equiatomic FeCoCrNiZr 0.4 (Zr 0.4 ) high-entropy alloys (HEAs) Received 25 May 2018 were synthesised by mechanical alloying and spark plasma sintering. XRD analysis verified the Revised 24 August 2018 formation of FCC and BCC solid solution phases in both alloys after 30 h of ball milling. While the SPS FeCoCrNi alloy contains both FCC and BCC solid solution phases, the FeCoCrNiZr 0.4 presents an FCC solid solution. The thermodynamic analysis showed that FeCoCrNiZr 0.4 is more stable with respect to the FeCoCrNi alloy. The phase stability of FeCoCrNiZr 0.4 was revealed up to ∼800°C. The shear strength and hardness of the FeCoCrNi HEA improved with Zr addition. plasma sintering; thermal Failure analysis of the shear punch tested samples revealed a ductile fracture with dimple stability; mechanical structure for FeCoCrNi and a brittle fracture with a smooth featureless surface for FeCoCrNiZr 0.4 .
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