Effect of Final Rolling Temperature on Microstructures and Mechanical Properties of AZ31 Alloy Sheets Prepared by Equal Channel Angular Rolling and Continuous Bending.

Laixin Shi,Yong Lian,Lei Liu,Jin Zhang,Mingbo Yang,Li Hu,Tao Zhou

doi:10.3390/ma13153346

Abstract

The effects of final rolling temperature on the microstructures, texture and mechanical properties of AZ31 Mg alloy sheets prepared by equal channel angular rolling and continuous bending (ECAR-CB) were investigated. Extension twins {10–12} could be observed in the ECAR-CB deformed sheets. The increase in the number of {10–12} extension twins with increasing final rolling temperature might be attributed to the larger grain size and faster grain boundary migration. For all the ECAR-CB sheets at different final rolling temperatures, the deformation texture contains a basal texture component and a prismatic texture component, whereas the annealing recrystallization texture becomes a non-basal (pyramidal) texture with double peaks tilting away from normal direction (ND) to rolling direction (RD). With increasing final rolling temperature, the tilted angle of double peaks of annealing recrystallization non-basal texture increases. In addition, the plasticity and formability of ECAR-CB-A (ECAR-CB and then annealing) AZ31 Mg alloy sheets at room temperature can be improved by increasing the final rolling temperature.

Highlights

Magnesium (Mg) alloys have received great attention because of outstanding properties such as low density, high specific strength and damping capacity; they have potential applications in aerospace and automotive industries [1,2,3,4,5]
We investigated the effects of final rolling temperature on the microstructures, texture and mechanical properties of AZ31 Mg alloy sheets prepared by the equal channel angular rolling and continuous bending (ECAR-CB) method
For the equal channel angular rolling (ECAR)-CB AZ31 magnesium alloy sheets, {10–12} extension twins could be observed, and the amount of {10–12} extension twins increased with increasing temperature, which might be attributed to the larger grain size and faster grain boundary migration

Summary

Introduction

Magnesium (Mg) alloys have received great attention because of outstanding properties such as low density, high specific strength and damping capacity; they have potential applications in aerospace and automotive industries [1,2,3,4,5]. For wrought magnesium alloy sheets, a strong basal texture can usually be generated after the traditional rolling process, which further degrades their stretch formability at room temperature [6,7,8,9,10]. Weakening or eliminating the basal texture has been considered as an effective way to improve the formability of wrought magnesium alloy sheets at room temperature. Many plastic deformation technologies have been developed to tailor the texture of wrought magnesium alloy sheets for improving their formability at room temperature [11,12,13,14,15,16,17,18,19,20,21]

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Results

Conclusion