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高速冲击加载中变形方式对预孪生Mg-3Al-1Zn合金双峰织构演化的影响

作者:DSI上海办事处 浏览: 发表时间:2023-10-12 12:43:43

Effect of deformation mode on double-peak texture evolution in pre-twinning Mg-3Al-1Zn alloy during high-speed impacting loading

Xiao Liu 、Heng Li 、Minyue Hu、Biwu Zhu、Chao Xie 、Xiaofeng Zhang、Wenhui Liu 

Abstract

An investigation of the quantitative effect of the deformation process on the deformation mode, texture evolution, and their internal relationship could help control the mechanical properties of targeted materials. In this study, the deformation mechanism and texture evolution of pre-twinning AZ31 magnesium alloy under medium temperature with high-speed impact loading are investigated through electron backscattered diffraction and the coupled simulation of the finite element method and viscoplastic self-consistent models. Basal and < c+a> pyramidal slips are the dominant accommodation modes. The activation of nonbasal slip is promoted, and the number of twins increase with an increase in the impact pressure, leading to a decrease in the relative activity of the basal slip. Based on typical grain rotation statistics, the effects of basal slip, pyramidal slip, and extension twins on grain rotation are studied. With an increase in the pressure, the relative activity difference between the basal slip and pyramidal glide decreases, which is beneficial for the formation of a double-peak basal texture and the enhancement of the intensity of the double-peak texture. The twin density affects the split angle between the double peaks.

Introduction

Magnesium alloys are widely used in the aerospace, automotive transportation, and electronic industries owing to their low density and high specific strength, which lead to significant reduction in greenhouse gas emissions [1], [2], [3], [4]. Critical components in the automotive and aerospace industries must display appropriate resistance to failure under severe loading conditions [5], [6], [7]. Owing to their hexagonal close-packed structure, magnesium alloys easily form a strong (0002) basal texture during plastic deformation [8], [9], [10], [11], leading to low elongation and strong plastic anisotropy at room temperature. Texture evolution is closely related to the activation of the deformation modes and affects mechanical response during plastic deformation.


However, it is difficult to quantitatively understand the impact of deformation mechanisms such as slip and twinning on texture evolution and mechanical response during the entire deformation process [12]. The viscoplastic self-consistent (VPSC) model can precisely predict the deformation behavior, texture evolution, and deformation mechanisms of polycrystalline materials while consuming a very small amount of computational resources [13], [14]. Lyu et al.[15] studied the formation of abnormal texture in the Mg-Y-Sm-Zn-Zr alloy using the VPSC model and found that the critical resolved shear stress (CRSS) of the basal  slip was enhanced and exceeded the CRSS of the pyramidal slip during extrusion. Zhou et al.[16] investigated the dislocation behavior of extruded Mg-Y alloy through VPSC simulation during tensile deformation along the extrusion direction at room temperature and reported that the dominant dislocation slip was dislocations and the contribution of dislocations to the tensile deformation was limited. Zhou et al.[17] employed the VPSC model to study the impact of Sc content on ductility enhancement in as-extruded Mg-xSc alloys and found that the addition of Sc enhanced the activation of nonbasal slip, leading to an improvement in ductility. Wang et al.[18] determined the velocity gradient at various positions during stretch formation at room temperature in rolled ZK60 magnesium alloy sheets using the finite element method (FEM) and coupled the calculated velocity gradient with the VPSC model to simulate the texture evolution during stretch formation. They reported that basal slip and tension twinning were favorable for basal texture weakening in the TD sample, enhancing the hardenability and stretchability. Therefore, the VPSC model coupled with the FEM is a valid technique that can effectively link the deformation history with the mechanical behavior and texture evolution of alloys during plastic deformations [19], [20], [21].


The introduction of twins can effectively improve the yield strength and plasticity of Mg alloys under both static [11], [22] and dynamic [23], [24] deformations. The critical condition for dynamic recrystallization of magnesium alloys with twins is lower than that of magnesium alloys without twins [25]. In this study, we established a VPSC model based on experimental results. The velocity gradient of the pre-twinning AZ31 magnesium alloy under medium-temperature impact loading conditions, that is, the bond between the FEM and VPSC model, was obtained by extending the ABAQUS-VUMAT subroutine. Both the macroscopic and microscopic deformation processes of the pre-twinning AZ31 magnesium alloy were investigated experimentally and through the VPSC model coupled with the FEM. Subsequently, the deformation mechanisms and texture evolution were determined.

Section snippets

Impact tests

The alloy used in this study was a pre-twinning AZ31 magnesium alloy with a chemical composition of Mg-3.19Al-0.81Zn-0.33Mn (all in wt%). The pre-twinning AZ31 magnesium alloy is manufactured by rolling at 300 ℃ and 20 r/min with a reduction of 10% on a two high laboratory rolling mill with 200 mm rollers. High-speed impact test samples with diameters of 8 mm and lengths of 4 mm were cut along the normal direction (ND). High-speed impact tests were then conducted using split Hopkinson pressure

Macroscale and mesoscale modeling

A two-scale computational approach coupling the FEM and VPSC model (FEM-VPSC), representing the macroscale and mesoscale, respectively, was employed to numerically link the deformation history of material points and microstructure activities with texture evolution and explore the intrinsic mechanisms of the mechanical responses under impact pressure in detail. In this study, the FEM simulation was performed using ABAQUS software. The VPSC model simulates the plastic deformation process of

Initial microstructure and Schmid factor analysis

The inverse pole figure (IPF) map and initial texture of the pre-twinned AZ31 magnesium alloy are displayed in Fig. 3. The red, yellow, fuchsia, and blue lines correspond to the {10−12}, {10−13}, {10−11}, and {10−11}-(10−12} twins, respectively. It can be seen that a substantial quantity of {10−12} twins are initiated, whereas a small quantity of {10−13}, {10−11}, and (10−11}-{10−12} twins are observed. The {10−12} twins were parallel to each other, whereas some of the twins crossed each other. 

Conclusions

Impact deformations were conducted on the twinned AZ31 Mg alloy at various temperatures (150 and 200 ℃) and impact pressures (0.3, 0.5, and 0.7 MPa). The activation of the deformation modes and texture evolution during the medium-temperature impact process were analyzed through experimental observations and coupled FEM-VPSC simulations. The FEM-VPSC model can accurately simulate the high-speed impact deformation process, facilitate a quantitative understanding of the impact of deformation

CRediT authorship contribution statement

Xiao Liu: Formal analysis, Data curation, Writing − original draft. Heng Li: Software, Methodology. Minyue Hu: Visualization, Calculation. Biwu Zhu: Conceptualization, Writing − review & editing. Xie Chao: Writing − review & editing. Xiaofeng Zhang: Visualization. Wenhui Liu: Methodology.

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 52071139 and 12272192), the National Natural Science Foundation of Hunan (Nos. 2023JJ30262 and 2023JJ30252), the Research Foundation of Education Bureau of Hunan Province (No. 21B0471) and the High-level Talent Gathering-Innovative Talent Project of 2021 Hunan (No. 2021RC5010).

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高速冲击加载中变形方式对预孪生Mg-3Al-1Zn合金双峰织构演化的影响
Effect of deformation mode on double-peak texture evolution in pre-twinning Mg-3Al-1Zn alloy during high-speed impacting loading
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