Eutectic　high-entropy　alloys　(EHEAs)　are　usually　prepared　by　melting　method.　Here,　bulk　eutectic　high-entropy　alloys,　AlCoCrFeNi2.1,　with　a　phase　constitution　of　FCC　and　BCC　phases,　was　successfully　prepared　by　spark　plasma　sintering　using　gas-atomized　powders　as　starting　materials.　With　the　increase　of　sintering　temperature,　a　gradual　microstructure　evolution　from　lamellar　eutectic　to　massive　eutectic　was　observed,　which　should　be　caused　by　the　decrease　of　surface　energy.　When　sintering　temperature　was　1200　°C,　the　lamellar　eutectic　microstructure　was　completely　transformed　into　a　massive　eutectic　microstructure.　The　bulk　EHEA　shows　the　best　mechanical　performance　when　the　sintering　temperature　is　1000　°C.　The　compressive　yield　strength,　fracture　strength,　and　ductility　reached　758.60　MPa,　2626.29　MPa,　and　45.45%,　respectively.　Furthermore,　the　tensile　yield　strength,　fracture　strength　and　ductility　reached　538.13　MPa,　963.55　MPa,　and　13.31%,　respectively.　The　improved　properties　can　be　attributed　to　phase　interfaces　between　FCC　and　BCC,　and　lamellar　microstructures　in　EHEA,　strengthening　the　alloys　by　inhibiting　dislocation　motion.　The　hardness　of　the　alloy　sintered　at　1000　°C　also　reached　a　maximum　value　of　294.3　HV　at　1000　°C,　which　has　the　best　wear　resistance,　and　the　wear　mechanism　was　adhesive　wear.　The　phase　interface　orientation　relationship　of　AlCoCrFeNi2.1　EHEA　satisfies　the　N-M　relationship,　which　is　FCC//BCC,{111}FCC//{110}BCC.　©　2022