Effect of Loading Direction on the Tensile Properties and Texture Evolution of AZ31 Magnesium Alloy

Yuyu Li,Qianhua Yang,Zhibing Chu,Chun Xue,Tingzhuang Han,Hong Gao,Xiaodong Zhao

doi:10.3390/cryst11101193

Abstract

Samples were cut from an extruded AZ31 magnesium alloy bar for uniaxial tensile and EBSD characterization tests. The long axis and bar extrusion directions were 0° (T0 sample), 45° (T45 sample), and 90° (T90 sample). The effects of loading direction on the tensile behavior, microstructure, and texture evolution of the magnesium alloy were studied. Results show that the obvious mechanical anisotropy of tensile behavior is affected by the loading direction, and the T0 sample with a grain c-axis perpendicular to the extrusion direction has a strong basal texture and high flow stress and yield strength. The loading direction has a significant influence on the microstructure characteristics of different samples, especially the number of {10–12} tensile twins and {10–11} compression twins. Texture evolution results show that the loading direction and the effect of deformation mode on the deformation mechanism lead to variations in texture evolution: the basal slip and prismatic slip during the plastic deformation of the T0 specimen, the compression twin of the T45 specimen, and the tensile twin of the T90 specimen.

Highlights

Owing to the advantages of magnesium alloys with high specific strength, high specific stiffness, and low densities [1,2], wrought magnesium alloys have great potential in various structural applications, in the automotive, communications, and military fields [3,4,5]
Zhang et al [8] used a one-way bending (RUB) process to improve the texture of an AZ31 magnesium alloy sheet and found that the RUB-treated sheet had a weaker base texture, which was comparable to a sheet with a strong base texture, and it had enhanced ductility
Throughh tteennssiilleetetesststsuusisninggananEBESBDSDchcahracratecrtiezraiztiaotniotnecthencohlnooglyogayndanVdPSVCPmSCodmelo,dthele, tinhfle uinenflcueeonfcelooafdlionagddinirgecdtiiorencotinonthoentetnhseilteepnsroilpeeprtrioeps earntidesteaxntudreteexvtuorlueteiovnolouftmioangonfemsiuamgnalelsoiyusmwaalslosytusdwieads,satunditehde, afonldlotwheinfgolclonwcilnugsicoonnscwluesrieonosbtwaienreedo:btained: (1) An obvious difference in the loading direction leads to the obvious anisotropy of the tensile behavior

Summary

Introduction

Owing to the advantages of magnesium alloys with high specific strength, high specific stiffness, and low densities [1,2], wrought magnesium alloys have great potential in various structural applications, in the automotive, communications, and military fields [3,4,5]. Texture greatly influences the ductility and formability of magnesium alloys [7] and can be improved by reducing the strength of the base texture. Only magnesium alloys with a single texture shape were used in investigating microstructure evolution during deformation [19,20], and the effects of different loading directions on tensile behavior, microstructure, and texture evolution were not considered. The viscoplastic self-consistent (VPSC) model was used in simulating and predicting the texture evolution law of tensile behavior, and the microstructure evolution mechanism of AZ31 magnesium alloy was mastered. This is of great significance for obtaining high-performance magnesium alloy materials

Viscoplastic Self-Consistent Model

Conclusions