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Tailoring the microstructure and texture of a dual-phase Mg–8Li alloy by varying the rolling path

Dual-phase Mg–Li alloys exhibit better formability than conventional Mg alloys. However, conventional processing methods, such as rolling and extrusion, usually result in a lamellar structure, which will generate a strong planar anisotropy. In the present study, an as-extruded dual-phase Mg-8Li plat...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2022-06, Vol.844, p.143202, Article 143202
Main Authors: Xu, Jing, Peng, Yanshuo, Guan, Bo, Xin, Yunchang, Chapuis, Adrien, Huang, Guangjie, Liu, Qing
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container_title Materials science & engineering. A, Structural materials : properties, microstructure and processing
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Peng, Yanshuo
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Xin, Yunchang
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Huang, Guangjie
Liu, Qing
description Dual-phase Mg–Li alloys exhibit better formability than conventional Mg alloys. However, conventional processing methods, such as rolling and extrusion, usually result in a lamellar structure, which will generate a strong planar anisotropy. In the present study, an as-extruded dual-phase Mg-8Li plate was rolled along two different directions, extrusion direction (ED-rolling) and transverse direction (TD-rolling), with the aim to investigate the effect of rolling path on the microstructure, texture and in-plane mechanical anisotropy. The results show that the lamellar α+β structures in the initial plate well remained after 20% or 50% ED-rolling and subsequent annealing at 250 °C for 4 h. In contrast, this lamellar structure completely disappears after TD-rolling and subsequent annealing. The basal poles of grains close to the TD in α phase in the initial plate slightly rotate from TD towards the normal direction (ND) during ED-rolling, while are largely parallel to the ND after TD-rolling. The variation of rolling path hardly alters the texture of β phase. For both α and β phases, annealing does not change the type of texture, only reduce the maximum intensity of texture. The mechanisms for texture evolution during rolling were studied using visco-plastic self-consistent (VPSC) simulations. It is shown that the main texture features of rolled plates are determined by the activated deformation modes in each phase, while α/β phase boundaries will retard the texture evolution. After ED-rolling, there is an obvious anisotropy in work hardening behavior and elongation for tension along the TD and RD, while this mechanical anisotropy disappears after TD-rolling. The corresponding mechanism were discussed.
doi_str_mv 10.1016/j.msea.2022.143202
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subjects Anisotropy
Annealing
Beta phase
Elongation
Evolution
Extrusion
Lamellar structure
Magnesium alloys
Magnesium base alloys
Microstructure
Rolling path
Texture
Twinning
Work hardening
title Tailoring the microstructure and texture of a dual-phase Mg–8Li alloy by varying the rolling path
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