Toward Texture Decrease of Rare Earth Magnesium Alloy by Asynchronous Rolling

Abstract

The microstructure of magnesium alloys present anisotropy and stronger texture after synchronous rolling (SR) because of the continuous symmetric stress, which is one of the obstacles limiting the application of materials. Here the texture, grain size and mechanical properties of Mg-13Gd-4Y-2Zn-0.5Zr rare earth magnesium alloy trained by asynchronous rolling (AR) process were investigated. The introduced additional shear deformation during asynchronous rolling can more significantly weaken the basal texture strength (SR: 17.565; AR: 14.100) and refine the average grain size (SR: 47.80 μm; AR: 26.42 μm), so as to improve the microstructure homogeneity. Besides, the shear deformation can disperse the grain orientation along RD and weaken the basal texture strength, and thereby increasing the activation fraction of the basal slip during stretching along RD. Meanwhile, most of the fine-grained strengthening effect can be counteracted, resulting in the strength is similar to that of synchronously rolled one. These findings show that the mechanical properties control of Mg-13Gd-4Y-2Zn-0.5Zr alloy by asynchronous rolling is a promising subject, which can further broaden the application field of rare earth magnesium alloys.

Keywords: Rare earth magnesium alloys, Asynchronous rolling, microstructure, mechanical property