Effect of Pre-stretch Strain at High Temperatures on the Formability of AZ31 Magnesium Alloy Sheets

doi:10.1007/s40195-022-01443-1

Abstract

Abstract:

High-temperature pre-stretching experiments were carried out on the AZ31 Mg alloy at 723 K with strain levels of 2.54%, 6.48%, 10.92%, and 19.2% to alter the microstructure and texture for improving room-temperature formability. The results showed that the strain-hardening coefficient increased, while the Lankford value decreased. In addition, the Erichsen values of all pre-stretch sheets were enhanced compared with that of the as-received sheet. The maximum Erichsen value increased from 2.38 mm for the as-received sample to 4.03 mm for the 10.92%-stretched sample, corresponding to an improvement of 69.32%. This improvement was mainly attributed to the gradual increase in grain size, and the (0001) basal texture was weakened due to the activated non-basal slip as the high-temperature pre-stretching strain levels increased. The visco-plastic self-consistent analysis was performed on the as-received and high-temperature pre-stretched samples. Results confirmed the higher activity of the prismatic slip in 10.92%-stretched sample, leading to divergence and weakening of basal texture components. This results in an augmentation of the Schmid factor under different slip systems. Therefore, it can be concluded that high-temperature pre-stretching technology provided an effective method to enhance the formability of Mg alloy sheets.

Key words: High-temperature deformation, Grain growth, Magnesium alloys, Texture, Visco-plastic self-consistent modeling, Formability

Yongqiao Li, Lifei Wang, Xiaohuan Pan, Qiang Zhang, Guangsheng Huang, Bin Xing, Weili Cheng, Hongxia Wang, Kwang Seon Shin. Effect of Pre-stretch Strain at High Temperatures on the Formability of AZ31 Magnesium Alloy Sheets[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(1): 48-60.

Figures/Tables 12

Fig. 1 Schematic illustration of the high-temperature pre-stretching experiment

Fig. 2 OM micrographs and corresponding average grain size distribution maps of the AZ31 Mg alloy pre-stretched at 723 K: a as-received; b 2.54%; c 6.48%; d 10.92%; e 19.2%

Fig. 3 IPF, misorientation distribution and corresponding grain size distribution maps of a as-received sample HT1 and pre-stretched samples at different strains at 723 K: b HT2, c HT3, d HT4, e HT5

Fig. 4 (0001) (10-10) and (11-20) pole figures of various Mg alloys: a as-received sample HT1 and pre-stretched samples at 723 K: b HT2, c HT3, d HT4, e HT5

Fig. 5 Schmid factors and corresponding average values in a as-received sample HT1, pre-stretched samples at 723 K: b HT2, c HT3, d HT4, e HT5 and in different slip systems: f basal slip, g prismatic slip, h pyramidal slip

Fig. 6 Mechanical properties of as-received and various pre-stretched Mg alloy sheets along different directions: a RD, b 45°, c TD, d YS and UTS

Table 1 Mechanical properties of the as-received and various pre-stretched Mg alloy sheets

Fig. 7 Predicted and experimental true stress-strain curves of a as-received (HT1) and partial high-temperature pre-stretched samples: d HT4, g HT5 and the corresponding relative activities during tension along RD based on the VPSC simulation: b, e, h initial texture measured and simulated pole figures of as-received sheet in different slip systems: c basal slip, f prismatic slip, i pyramidal slip

Fig. 8 τ0 used for VPSC simulation

Table 2 Average tensile properties at room temperature of the as-received and various pre-stretched Mg alloy sheets in the tensile directions of RD, 45° and TD

Fig. 9 a n, b r values of the as-received and pre-stretched samples

Fig. 10 IE values of various AZ31 alloy sheets in a as-received (HT1) and pre-stretched samples at 723 K: b HT2, c HT3, d HT4 and e HT5

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