PRODUCTION OF SUPERPLASTIC AZ91 MAGNESIUM ALLOY

摘要

PURPOSE: To develop an AZ91 magnesium alloy showing ultraplasticity by subjecting AZ91 magnesium alloy rapidly solidified powder to compacting in vacuum in a vacuum and thereafter executing hot extrusion. ;CONSTITUTION: AZ91 magnesium alloy rapidly cooled and solidified powder is vacuum-sealed in a magnesium can, and the rapidly solidified powder is compacted and sintered in a vacuum by using a hot press machine. Moreover, this sintered body is subjected to hot extrusion to produce the AZ91 magnesium alloy. In the process of the hot extrusion, recrystallization occurs, and simultaneously, an oxidized film on the surface of the rapidly solidified powder suppresses the growth of the crystal grains, thereby, a fine grain structure can be obtd., and its ultraplasticity is developed.;COPYRIGHT: (C)1996,JPO