The invention relates to a preparation method of a nano
zirconium dioxide reinforced NbMoTaW
refractory high-entropy
alloy, which comprises the following steps of: ball-milling and mixing
metal powder formed by mixing Nb
powder, Mo
powder, Ta powder and W powder with equal
molar ratio or nearly equal
molar ratio and nano ZrO2 particles in a high-energy
ball mill to obtain mixed powder; and the obtained mixed powder is placed in a
graphite mold, pressure
sintering is conducted in a high
vacuum state through a
spark plasma sintering method, and the high-strength ZrO2 reinforced NbMoTaW
refractory high-entropy
alloy is obtained. According to the method, the technological process is simple, the cost is low, the efficiency is high, the ZrO2 enhanced NbMoTaW
refractory high-entropy
alloy which is uniform in structure, fine in
crystal grain and high in strength and
plasticity and has nano ZrO2 dispersed distribution is obtained, compared with the prior art, the room-temperature
plasticity of the NbMoTaW refractory high-entropy alloy is greatly improved, and the alloy has the advantages of being high in strength and
plasticity. The defects of composition segregation, long mechanical alloying test period and low powder yield caused by an existing
casting method preparation process are effectively overcome.