Abstract
Al-Mg(68%) alloy ingots containing small amounts of Mn and/or Cr were prepared in a melting-casting apparatus protected by argon atmosphere.Macrostructure, grain size, hardness and density of dispersed fine particles were examined on the plate specimens of the ingot.X-ray pole figure was also examined on the sheets containing 5%Mg and small amounts of Mn and Cr.The results obtained were as follows:(1) There were upper and lower limits of Mg content in abnormal grain growth of Al-Mg alloys.(2) The limits were explained from the relation between the initial grain growth and the density of dispersed fine particles, according to M. Hillbert's Theory on abnormal grain growth.(3) The aggregate structure of secondary recrystallization of 5056 alloy sheets were found to be composed of (110) [111], (001) [110], (113) [110] and (hkl) [110] planes.
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