Effect of microstructures and textures on the anisotropy of mechanical properties of AZ31 magnesium alloy sheets subjected to high strain rate rolling

Abstract

The AZ31 magnesium alloy sheets with different microstructures and textures were produced by high strain rate rolling (HSRR) at various temperatures and strain rates. Tensile tests were carried out on AZ31 magnesium alloy sheets along rolling direction (RD), transverse direction (TD) and 45° along the rolling direction (45° RD) at room temperature. The microstructures and textures were determined. The Schmid factors (SFs) contour lines were also calculated. The tilt angle of the c-axis towards the RD affects the anisotropy of tensile strength. For the AZ31 magnesium alloy sheets subjected to relatively low strain rate rolling, the anisotropy of yield strength is comparatively obvious, due to the elongated grains. When the loading direction is close to basal plane, prismatic slip is not favored during tension deformation at room temperature. The anisotropy of yield strength mainly depends on the critical resolved shear stress/Schmid factor (CRSS/m) ratios of second-order (2nd-order) pyramidal slip.

Effects of Aging Process on the Damping Performance of ZK60 Magnesium Alloys Prepared by Large Strain Rolling

“…It can be seen that the heat treatment had a great impact on the number of and spacing between the strong and weak pinning points. When the stress was high enough, the dislocation line broke away from the weak pinning points and enhanced the damping performance [4]. From Figures 1, 3, and 4, it can be seen that during the aging process, the grain size remained unchanged, but the amount of the second phase increased as the aging time increased.…”

“…It can be seen that the heat treatment had a great impact on the number of and spacing between the strong and weak pinning points. When the stress was high enough, the dislocation line broke away from the weak pinning points and enhanced the damping performance [4].…”

“…As one of the best metallic damping materials, magnesium and magnesium alloys have the advantages of high specific strength, high specific stiffness, low density, and good damping performance. They are called "21st century green engineering materials" [4] and are widely used in aerospace, automotive, military, and other industries [5]. Therefore, the study of high damping magnesium alloys cannot only reduce the environmental pollution caused by vibration but also improve the service life of machines [6].…”

Hot Rolling of ZK60 Magnesium Alloy with Isotropic Tensile Properties from Tubing Made by Shear Assisted Processing and Extrusion (ShAPE)

“…ZK60 has a moderate cost and favorable ratio of compressive to tensile strength (compared to RE Mg alloys) [31]. SPD techniques such as Equal Channel Angular Pressing (ECAP), Accumulative Roll Bonding (ARB) and Cyclic Extrusion and Compression (CEC) have been employed on ZK60 and other Mg alloys to refine grain size (to the range of 0.6-6 µm) and increase strength while also maintaining favorable ductility [32][33][34][35][36][37][38][39]. Previous work by the current authors employed ShAPE to form ZK60 tubes with average grain size less than 5 µm and to obtain a texture with basal planes oriented 20-45 • to the extrusion axis.…”