The Effect of Sheet Thickness, Loading Rate and Punch Diameter on the Deformation Behaviour of AZ31 during 3-Point Bending

Abstract

In this study, the influence of sheet thickness, loading rate, and punch diameter on the bending behaviour of twin-roll cast, rolled and heat-treated AZ31 magnesium alloy was investigated. Therefore, the 3-point bending test was performed at room temperature using an electromechanical testing machine (v = 0.1−10 mm/s) with different punch diameters (D = 2 mm, 8 mm, 16 mm). The initial material has a recrystallized microstructure with grain sizes of 6−9 µm. It is shown by the mechanical investigations that the bending force increases with the sheet thickness. In contrast to this, the bending angle is independent of the sheet thickness. In addition, the punch diameter and the loading rate do not influence the maximum force and the bending angle significantly.

Finite Element Simulation and Experimental Study of U-Bending Forming of High-Strength Mg-Gd-Y-Zn-Zr Alloy

“…The results showed that when the sheet was heated above 200 °C, the yield stress of the material was significantly reduced, showing good high-temperature formability. At present, the research of magnesium alloy sheet bending process is mainly focused on the AZ series magnesium alloy, and most of the research is the AZ31 magnesium alloy, while the research of rare earth magnesium alloy is less prominent [13,14]. While AZ series magnesium alloys have many advantages, they also have shortcomings, including low strength, unstable quality, and poor heat resistance, and the addition of rare-earth elements can improve their performance significantly [15][16][17].…”

“…The results showed that when the sheet was heated above 200 • C, the yield stress of the material was significantly reduced, showing good high-temperature formability. At present, the research of magnesium alloy sheet bending process is mainly focused on the AZ series magnesium alloy, and most of the research is the AZ31 magnesium alloy, while the research of rare earth magnesium alloy is less prominent [13,14].…”