Microstructure and Mechanical Property of Mg-3Al-1Zn Magnesium Alloy Sheet Processed by Integrated High Temperature Rolling and Continuous Bending

Yong Lian,Laixin Shi,Wenjun Ge,Mingbo Yang,Tao Zhou,Li Hu,Benhong Liao,Jin Zhang

doi:10.3390/met10030380

Yong Lian, Laixin Shi + Show 6 more

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https://doi.org/10.3390/met10030380

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Abstract

In the present study, we developed an integrated process that combined high-temperature rolling and continuous bending as a single processing step, i.e., the HTR-CB process, and the process was carried out on Mg-3Al-1Zn magnesium alloy sheet in order to improve its ductility at room temperature. The microstructure, texture and mechanical property of the HTR-CB sample were investigated. The results show that the HTR-CB sample after annealing exhibits a high Erichsen value of 6.9, which is more than 1.5 times larger than that (4.6) in the HTR sheet, mainly due to the formation of non-basal textures with double peaks titling at the range of ± 30°~ ± 38° from the normal direction towards the rolling direction. The main reasons for the texture modifications during the HTR-CB process and annealing are discussed.

Highlights

Due to their low density and high specific strength, the interest in magnesium (Mg) alloys has increased in recent years for weight-critical applications in aerospace, automobile and electronic industries [1,2]
It can be seen that except for the channel height, the design and the other parameters of the HTR-CB mold was the same as that of the equal channel angular rolling-continuous bending mold (ECAR-CB) [17], because the main difference between the HTR and ECAR-CB process was that the main deformation mode at corner 1 of the mold was shear or bend deformation
According to Ref. [19], when the c was 1.29, the shear angle was about only 4◦, so the shear deformation does almost not occur during the ECAR process [19]

Summary

Introduction

Due to their low density and high specific strength, the interest in magnesium (Mg) alloys has increased in recent years for weight-critical applications in aerospace, automobile and electronic industries [1,2]. Huang et al [10] have found that by increasing the rolling temperature up to 525 ◦ C, the Erichsen value of AZ31 alloy sheets can be improved up to 8.6, due to the remarkable basal texture weakening after annealing. They suggested that the rotation of nuclei and small static recrystallization (SRX) grains in various directions during annealing may be promoted by the absorption of non-basal dislocations in boundaries, which leads to the remarkable weakened basal texture [11]. It has been reported that for the AZ31 alloy sheets processed by repeated unidirectional bending (RUB) at room

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Discussion

Conclusion