Studying the mechanical properties of AZ۳۱ magnesium sheet severely deformed by constrained groove pressing process

Constrained groove pressing (CGP) is a promising method for fabricating ultra-fine grained sheet metals based on severe plastic deformation (SPD). Accordingly, CGP was applied on AZ۳۱ magnesium sheets at two temperatures of ۱۵۰oC and ۲۰۰oC for various process passes from ۱ to ۳. Then the effect of CGP process and temperature was evaluated on the tensile strength of the samples along rolling direction (RD). The results showed that the CGP treatment significantly decreased the ductility of sheet samples while increasing their strength. It is seen that, more increase for ultimate strength has been achieved for pass three having a rise of ۲۲% compared to as-received specimen. However, the increase for passes one and two reaches to ۸% and ۱۰%, respectively. Although, the strength increases by rise of number of passes, ductility has been reduced in all three passes, where, in pass three, the ductility values reach to ۰.۱۳ being half of as-received ones. The microhardness was found to be sensitive to both pass number and process temperature, and increased by pass number, and decreased by temperature. Moreover, the hardness increased by the CGP pass number

کلیدواژه ها:

CGP ، AZ۳۱ ، strength ، hardness