Anisotropy of the Mechanical Properties of Twin-roll Cast, Rolled and Heat-treated AZ31 as a Function of Temperature and Strain rate

Abstract

The influence of temperature on the mechanical properties of twin-roll cast, rolled and heat-treated AZ31 was investigated under tensile loading from different directions (0°, 90). Therefore, quasi-static tensile tests with a strain rate of 0.76×10 −3 s −1 , 0.73×10 −2 s −1 , and 0.72×10 −1 s −1 were performed with an electromechanical universal testing device in the temperature range of −20 °C to 300 °C. The initial material exhibits a recrystallized microstructure with an average grain size of 7 μm. With increasing temperature and decreasing strain rate, the flow stress decreases and the elongation increases. Rising strain rates and decreasing temperatures enlarge the difference in stress between the deformation directions of 0° and 90°. Below 200 °C, the difference in elongation (0°−90°) remains at almost the same absolute level of 6 % (10 −3 s −1 ) and 4 % (10 −1 s −1 ). Above 200 °C, this difference increases, whereby an increase in the strain rate tends towards a reduction in the difference in elongation.

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

“…This is in contrast to the investigations of Kim et al [10] on conventional rolled AZ31 sheets, where 90° is the stronger direction. The anisotropic behaviour in the present study is typical for TRC AZ31, because it might be related to texture effects [11]. At a punch diameter of 16 mm, this difference (0°−90°) is only pronounced at t = 2.0 mm.…”

Anisotropy influence on the mechanical and microstructural characteristics of AZ31B sheets deformed at room and elevated temperature

“…This different behavior is due to the deformation mechanism: at room and 100°C, plastic deformation is mainly controlled by twinning (Fig. 5) [19]. On the other hand, above 100°C, at increasing temperature, mechanical twinning effect decreases whereas dislocation motion is enhanced as a consequence of the activation of more slip systems as well as recrystallization occurred making the microstructure finer ( Fig.…”

Influence of Deformation Controlled Strain Rate on Tensile and Compression Behaviour of Magnesium and Steel Wire

“…On the other hand, anisotropic deformation behaviour is expected from the magnesium alloy. The reasoning lies in the directional dependence of deformation mechanisms in the hexagonal lattice structure, which is enhanced by the distinct texture leading back to the extrusion process [8,9]. Standardised compression test specimens were machined with a ratio of 10 mm in diameter to 18 mm in length to eliminate the risk of specimens buckling when tested.…”