Effect of Strain Rate on Texture Formation Behavior in High Temperature Deformaion of AZ80 Magnesium

Magnesium and magnesium alloys are attracting attention as lightweight materials in the field of transportation equipment. Especially, AZ system magnesium alloys have excellent mechanical properties by adding elements of Al and Zn, and thus have been widely used in industry fields. However, magnesium alloys have low workability due to the limited slip system at room temperature, and machining at high temperatures develops texture, causing problems in secondary processing. Because of this problem, the application of magnesium alloys in the industrial field is limited.<br/>Texture control is one of the methods for improving workability at room temperature, and it can solve the problem of strong anisotropy formed after processing. Therefore, it is judged that understanding the mechanism of the texture formation behavior of magnesium alloy will play an important industrial and academic role that can increase the potential of magnesium alloy as a practical material in the future.<br/>In previous research, it was confirmed that the basal texture was formed irrespective of the initial texture, and that the basal texture was formed by continuous and discontinuous deformation. In addition, it was confirmed that the texture components other than the basal texture are formed and developed after deformation, depending on the initial texture.<br/>Since it is still limited to understand the texture formation mechanism of magnesium alloy, additional experiments were conducted under different deformation conditions. In this study, The AZ80 (7.86 wt%-Al, 0.46 wt%-Zn, 0.19 wt%- Mn, 0.22wt%-Na) magnesium alloy was rolled at 673K with a rolling ratio of 30% before compression, and heat treatment was performed at 723K for 1 hour. After that, the initial texture was changed and compression was carried out at 723K with strain rates of -0.4, -0.7, and -1.0 under the condition of strain rate of 5 × 10^-4 s^-1. As a result, unlike the study result of the specimen compressed at the strain rate 5 × 10-2 s-1, when the strain rate is 5 × 10^-4 s^-1, it was confirmed that the basal texture inclined by about 15 degrees from the ND surface to the RD surface was developed.