Hiroshi Asada, Kichizô Koike and Saburô Morimoto
The effects of manganese content and of the extrusion conditions on the recrystallization temperature of aluminium alloys were investigated and the following results were obtained. (1) According to the microhardness test of cold-rolled high purity Al-Mn alloys, it appears that the manganese content dissolved in solid solution is effective for the elevation of the recrystallization temperature. (2) With the extruded commercially pure Al-Mn and Al-Cu-Mn alloys, the elevation of the recrystallization temperature is proportional to the increase of Mn and Cu contents. (3) The recrystallization temperature drops by higher extrusion ratio or lower extrusion temperature. (4) From the above results it may be concluded that hot-working by extrusion gives the same influence as cold-working on aluminium alloys.
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