Preparation of WMoTaNbV Refractory High-Entropy Alloy Spherical Powder by Mechanical Alloying-Radio Frequency Plasma Spheroidization
WMoTaNbV refractory high-entropy alloy spherical powder was prepared by mechanical alloying and radio frequency plasma spheroidization using elemental powder as raw material.The influences of ball milling time and radio frequency plasma spheroidization process on powder phase,morphology,particle size and impurity content were studied.Properties of powder were analyzed and characterized by XRD,SEM,TEM,carbon sulfur meter,oxygen,nitrogen and hydrogen meter,laser particle size analyzer,etc.The results show that as the ball milling time increases,the low melting point elements gradually become solid solution to the high melting point elements.When the ball milling time is 14 h,refractory high-entropy alloy powder with a single bcc phase structure can be formed.The particle size gradually becomes refined with the prolongation of the ball milling time,and the impurity content increases with the prolongation of the ball milling time.Powder milled for 2 h is subjected to radio frequency plasma spheroidization.The median particle size of the spheroidized powder(D50)is 55.9 μm,and the oxygen and carbon contents are 0.054wt％and 0.021wt％,respectively.The powder flowability is significantly improved to 8.4 s·(50 g)-1,and the tap density reaches 8.80 g·cm-3.
mechanical alloyingradio frequency plasma spheroidizationrefractory high-entropy alloyspherical powder
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