Relationship among Initial Texture, Deformation Mechanism, Mechanical Properties, and Texture Evolution during Uniaxial Compression of AZ31 Magnesium Alloy

Hui Su,Chun Xue,Zhibing Chu,Lifeng Ma,Yugui Li

doi:10.3390/cryst10090738

Hui Su, Chun Xue + Show 3 more

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https://doi.org/10.3390/cryst10090738

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Abstract

Cuboid samples with significant initial texture differences were cut from extruded AZ31 Mg alloy samples, whose long axis and bar extrusion direction ED were 0° (sample E0), 45° (sample E45), and 90° (sample E90). The relationship among the initial texture, deformation mechanism, mechanical properties, and texture evolution of the AZ31 Mg alloy was investigated systematically using a compression test, microstructure characterization, and the Viscoplastic Self-Consistent (VPSC) model. Results revealed a close relationship among them. By influencing the activation of the deformation mechanism, the deformation under different initial textures resulted in obvious mechanical anisotropy. Compared with E0 and E90, the initial texture of E45 was more conducive to the improvement of reforming ability after pre-compression. Meanwhile, the initial texture significantly affected the microstructure characteristics of the material, especially the number and morphology of the {10–12} tensile twins. Texture results showed that the priority of deformation mechanism depended on the initial texture and led to the difference in texture evolution.

Highlights

Mg alloy has high specific stiffness, high specific strength, low density, and good damping performance [1], an important choice for material application in the fields of communication, military industry, and automobile [2,3,4]
The rolling direction (RD) and transverse direction (TD) samples with distinct differences in initial texture were subsequently subjected to the bending process that has been reported by
The results indicated that the plastic deformation mechanism activated in the c-axis//TD textured grains during rolling is sensitive to the Crystals 2020, 10, 738; doi:10.3390/cryst10090738

Summary

Introduction

Mg alloy has high specific stiffness, high specific strength, low density, and good damping performance [1], an important choice for material application in the fields of communication, military industry, and automobile [2,3,4]. Experimental studies showed that the initial texture in the forming process of Mg alloy has a remarkable effect on its material properties [5,6,7,8,9,10]. The rolling direction (RD) and transverse direction (TD) samples with distinct differences in initial texture were subsequently subjected to the bending process that has been reported by. Wang [11] et al, and the results revealed that the conspicuous asymmetry in the bending behavior is ascribed to the initial texture and weaker basal texture is favorable to improving the bending properties. Singh [12] investigated and compared the micromechanical deformation behavior of E-form fine grain (EFG), E-form coarse grain (ECG), and AZ31 Mg alloys by using a mini V-bending test. The results indicated that the plastic deformation mechanism activated in the c-axis//TD textured grains during rolling is sensitive to the Crystals 2020, 10, 738; doi:10.3390/cryst10090738 www.mdpi.com/journal/crystals

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Conclusion