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Date of Publication:2022-10-06

Journal:机械工程材料

Volume:33

Issue:9

Page Number:57

ISSN No.:1000-3738

Abstract:The effect of melt ultrasonic treatment (400 W) on the pores,
   microstructure and as-cast component distribution of 7050 aluminium
   alloy was studied by metalloscopy, Archimedes' method, scanning electron
   microscopy and electron probe micro analysis. Te results indicate that
   good degassing and refinement results could be obtained after the melt
   was treated by ultrasonic. As the ultrasonic treatment time was
   prolonged, the pores in the ingot decreased at first and then increased,
   while the density of the ingot increased at first and then ' decreased.
   The as-cast microstructure was refined at first and then was coarsened.
   When it was treated by ultrasonic for 90 s, the degassing and refinement
   effects were the best, a compact as-cast microstructure with no pore
   could be obtained. Ultrasonic treatment could also reduce the formation
   of second-phases at grain boundaries and make the component distribution
   more uniform.

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