Effect of ultrasonic treatment on solidification structure and properties of ZA30 zinc alloy
ZA30 zinc alloy,as a wear-resistant material,is mainly used in the castings of shaft sleeves,bearing shells and other products.Alloying elements are added to improve the properties of ZA30 zinc alloy during the production,which not only causes resource consumption but also increases energy consumption.This article conducted ultrasonic treatment on the high-temperature liquid melt of ZA30 zinc alloy containing alloying elements Al,Cu,and Co.The solidification microstructure of ZA30 zinc alloy was observed by metallographic microscope,and the mechanical and friction properties of ZA30 zinc alloy were tested.The effect of ultrasonic action on the microstructure and properties of ZA30 zinc alloy was studied through the above experimental methods.The research results indicate that ultrasound changed the solidification structure and mechanical properties of ZA30 zinc alloy.Before and after ultrasonic treatment,the primary α phase of ZA30 zinc alloy changed from coarse dendritic structure to equiaxial crystal structure.Grain size became fine and uniform.The tensile strength of its solidified structure increased from 384.08 MPa to 410.94 MPa,and the hardness value increased from 184.00 HB to 194.66 HB,with little change in elongation.The average friction coefficient of its solidified structure changed little from 0.0343 to 0.0315,and the wear amount decreased from 0.10 g to 0.07 g,a decrease of 30％.It can be seen that ultrasonic treatment refined the solidification structure of ZA30 zinc alloy,improved its tensile strength and hardness,and reduced its wear amount.
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