Mechanical properties of high-entropy alloys CoCrFeNiMnW_x manufactured by laser powder-bed fusion additive manufacturing using mechanically alloyed plasma spheroidized powders

Additive manufacturing is the manufacture of products with a shape close to a given shape, in which any part with a complex geometry is made by layer-by-layer melting of powder material using the energy of a laser or electron beam. CoCrFeNiMnW_x high-entropy alloys are a promising material as a raw material used in additive manufacturing. In this work, three different compositions of CoCrFeNiMnW_x (x = 0, 0.125, 0.25) high-entropy alloys powder were obtained by mechanical alloying and plasma spheroidization processes. Compact samples were fabricated by L-PBF method. Tests of mechanical characteristics in the temperature ranged from − 196 to 600 °C showed practical invariability of fracture energy both at cryogenic and high temperatures. When W was added to the alloy in the amount of 0.125 and 0.25 formula units, the tensile strength increased on average by 9 and 19%, and the yield strength by 10 and 18%, respectively. When tested at liquid nitrogen temperature, it is found that the yield and strength limits increase by 30–35% while maintaining ductility.