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Date of Publication:2022-10-04

Journal:机械工程材料

Volume:33

Issue:7

Page Number:29-33

ISSN No.:1000-3738

Abstract:The effect of alternating magnetic field frequency on the meniscus,
   microstructure and element distribution of the static formed ingots of
   minitype square billet of 7050 aluminium alloy. The results indicate
   that the meniscus of melt was higher when the frequency of the
   alternating magnetic field was 777 Hz. The grains were coarse without
   the alternating magnetic field. There were obvious coarse second-phases
   in square billets. But the microstructure of square billets was composed
   of small and symmetrically equiaxed grains with the alternating magnetic
   field, and they distributed as reticulation. The grains were obviously
   refined from 171mum in the absence of the alternating magnetic field to
   121-128mum in the presence of the alternating magnetic field. The
   elements of the alloy were partly burnt out. The distribution of Mg, Zn,
   Cu was relatively uniform when the frequency of the alternating magnetic
   field was 777Hz.

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