Microstructures of AZ61 Magnesium Alloy Solidified via Ultrasonic Vibration Treatment

Jun Ping Yao; Zhong Sun; Wen Yuan Long; Lei Zhang

doi:10.4028/www.scientific.net/AMR.750-752.691

Paper Titles

Study on Performance of Beryllium Bronze's Stress Relaxation
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Study of the Phases of Mg-Zn-La Magnesium Alloys at 150°C
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Study on Oxidation Behavior of Beryllium Bronze
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Influence of Stirring Time and Holding Time on Microstructure and Properties of the A356 Alloy Modified by Sc
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Microstructures of AZ61 Magnesium Alloy Solidified via Ultrasonic Vibration Treatment
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Effect of Cooling Rate on Microstructure of Semi-Solid AZ61 Slurry Produced via Ultrasonic Vibration Process
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Wear Behavior of Cu-Based Composite under Different Electrical Currents
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Organization and Performance of the Novel High Aluminum Zinc-Based Alloy
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Effect of Fe on the Performance of Rare Earth Aluminum Conductor
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Microstructures of AZ61 Magnesium Alloy Solidified via Ultrasonic Vibration Treatment

Abstract:

The effects of ultrasonic vibration (USV) on the solidified microstructure of AZ61 magnesium alloy were investigated. The experimental results show that the remarkable microstructural refinement is achieved when the USV was applied to the solidification of the AZ61 alloy. The average grain size is decreased from 263 μm without ultrasonic treatment to 98 μm with USV treatment. The microstructure evolution reveals that the primary α-Mg generates and grows in globular shape with USV, contrast with the dendritic shape without USV. The USV causes melt convection during solidification, which makes the temperature of the whole melt homogenized, and produces an undercooling zone in front of the liquid/solid interface, which makes the nucleation rate increased and big dendrites prohibited. In addition, the β-phase in the entire cross-section of the billet is significantly refined and also changed from continuous to discontinuous morphology. Spherical β-phase is formed during the solidification of billet treated with USV.