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.
Highlights
The automotive industry strives to reduce the CO2 emissions in the decades due to statutory specifications [1]
The sheet thickness dependent 3-point bending behaviour of twin-roll cast (TRC), rolled and heat-treated AZ31 is still unknown for different deformation conditions such as loading rate and punch diameter
The aim of this article is the examination of the influence of loading rate, punch diameter, sheet thickness, and sample extraction direction on the bending behaviour of AZ31 (Mg−3Al−1Zn−0.3Mn)
Summary
The automotive industry strives to reduce the CO2 emissions in the decades due to statutory specifications [1]. Beside optimized aerodynamics and engines, lightweight design is a major part to fulfil this effort. Magnesium and its alloys offer high specific mechanical properties, good workability, good shock-absorption capacity, and excellent recyclability. They were brought into focus for the automotive and aerospace constructors. Individual parts can be produced with specific bending tools. Crucial factors for the part quality are the sheet thickness, loading rate, and the anisotropic deformation behaviour. The sheet thickness dependent 3-point bending behaviour of twin-roll cast (TRC), rolled and heat-treated AZ31 is still unknown for different deformation conditions such as loading rate and punch diameter
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