TENSILE PROPERTIES OF THREE PREFORM-ANNEALED MAGNESIUM ALLOY SHEETS

摘要

Magnesium alloy sheet metal is potentially attractive for use inautomotive structural applications due to its high strength-toweightratio. However, application has been hindered by the lowroom-temperature formability of typical sheet alloys. Oneapproach to effectively increase formability is to change theforming process from one which involves a single stamping hit toone which utilizes two hits plus an intemediate anneal (i.e.,"preform anneal process").The purpoise of the intermediate??????????????????????anneal is to restore some of the softness and ductility which werereduced by deformation during the first hit.In this report, the preform annealing behavior of three rolledmagnesium alloy sheets was studied using uniaxial tensile tests.The sheets studied were: conventionally rolled (CR) AZ31B, CRZEK100, and specially rolled (SPR) AZ31B. The preformannealing process was found to increase the total elongation of allthree sheets compared to the elongation in the annealed O-temper.The CR ZEK100 with a thickness of 1.5 mm showed moreattractive tensile properties than the 1.6 mm CR AZ31B.Although the SPR AZ31B has a thickness of only 0.7 mm, it stillhas elongation comparable to the 1.6 mm CR AZ31B.