Effect Of Thermo-electropulsing Rolling On Mechanical Properties And Microstructure Of Magnesium Alloy

Thermo-electropulsing rolling process (TER), a technique by combining themethods of electropulsing with warm rolling process (WR), was created to manufactureAZ31magnesium alloy strips, and the effects of TER, electroplastic rolling process(EPR) and WR on mechanical properties and microstructure of AZ31magnesium werealso studied and compared in the current study. The effects of different temperature andpass reduction on mechanical properties and microstructure of AZ31magnesium underthe three rolling processes were studied, too.The results indicated that: TER was a feasible and effective rolling process. Whenthe rolling temperature was no less than150oC, AZ31magnesium could be rolled withlarge deformation on single-pass. TER tended to increase the elongation to failure (EL)and ultimate tensile strength (UTS) of the samples compared with that of the rawsample. The maximum EL and UTS of the samples increased by about94%and34%compared with that of the raw sample. The distinct and special regularity was found inTER. When the rolling temperature was no less than150oC, with an increase in thepass reduction, the EL under TER increased, more and more dynamic recrystallization(DRX) was induced, until the DRX proceeded to completion. A flagrant contrast wasfound when the effects of TER and WR on mechanical properties and microstructure ofAZ31magnesium were studied. At the same rolling temperature and pass reduction,more plastic, stronger and more soft AZ31magnesium could be made by TER than byWR. The DRX only started at200oC under WR, while the DRX has almost completedat150oC under TER. The flagrant contrast proved there were distinct electromigrationeffect in electropulsing. A flagrant contrast was found when the effects of TER and EPRon mechanical properties and microstructure of AZ31magnesium were studied. At thesame rolling temperature and pass reduction, more plastic, softer and less strong AZ31magnesium could be made by TER than by EPR. No DRX were induced under EPR,while the DRX has almost completed at150oC under TER. The flagrant contrastproved that until temperature was enough, the electromigration effect of electropulsingcould not be exerted.