A novel refractory WMoVCrTa high-entropy alloy possessing fine combination of compressive stress-strain and high hardness properties

摘要: Abstract Refractory high-entropy alloys (HEAs) possess outstanding mechanical strength at room and high temperature but lack the ductility. A novel refractory equiatomic powder combination of WMoVCrTa was selected verified for feasibility formation solid solutions or else bulk-metallic glasses (BMGs) in alloy based on Guo et al.’s criteria mismatch entropy criterion. The satisfies above two to crystallize solution phases inhibit BMGs. Mechanical alloying characteristics mixture were determined. particle size decreased continuously during initial milling later increased after 32 h alloying. homogeneous obtained 64 h. Crystallite sizes constituent elements progressive milling. nanocrystalline by milled 64 h revealed a major BCC1, minor BCC2 small unknown phases. lattice parameters those BCC1 are 3.16 A 2.88 A respectively. ingots fabricated from vacuum arc melting technique followed heat treatment. ingot crystallizes three such as laves phase. these 3.05 A 2.85 A Thereby, contracts slightly fabrication. fine compressive stress strain 995 MPa 6.2% respectively achieved temperature. Vickers hardness 773 ± 20HV0.5. density 11.52 g/cm3. excellent stress-strain properties can enable HEA potential candidate structural applications.