Formation of Abnormal Texture and Anisotropy Weakening Mechanism of Mg–Gd–Y–Zn–Zr Sheets by Rotary Forward Extrusion

IF 4 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Qianning Liu, Yunfang Liu, Yue Zhao, Xiaoxia Han, Zhimin Zhang, Huagui Huang, Linlin Li, Jianmin Yu
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Abstract

In this work, the effect of rotary forward extrusion technique on the development of texture structure and mechanical anisotropy of Mg–12Gd–4Y–2Zn–0.4Zr sheets is studied. The experiments were carried out using a large-sized alloy (φ330 × 1100 mm) at an extrusion temperature of 460 °C and a high extrusion ratio (10.18). The average grain size of the alloy gradually decreases from 126.3 μm to 10 μm with increasing cumulative stress during rotary forward extrusion, the size of the second phase also decreases significantly and is uniformly distributed. At the same time, an abnormal texture (an abnormal extrusion texture with c-axis parallel to extrusion direction) parallel to the extrusion direction (ED) was formed by the rotation of < 0001 > grains, which was caused by the rotation of the basal plane along the principal stress axis driven by the continuous non-basal plane slip under high stress conditions. Dynamic recrystallized (DRX) also plays an essential role in the formation of the abnormal texture, where the DRX process produces a proportion of grains with the nucleation orientation < 0001 > . The subsequent preferential growth of these grains further promotes the rotation of the majority of grains oriented in the < 0001 > direction. Although the nucleation phase of DRX contributes to the formation of abnormal texture, the preferred growth stage of grains has a greater influence on the abnormal texture. In addition, due to the introduction of strong shear stresses, the degree of buckling and fragmentation of the Long Period Stacking Ordered (LPSO) phase is enhanced in all directions, which in turn reduces the morphological differences in different directions, ultimately leading to a significant weakening of mechanical anisotropy. This weakening of mechanical anisotropy is closely related to the homogeneity of the grain size and the differences in the morphology of the LPSO phases.

Graphical Abstract

旋转正挤压Mg-Gd-Y-Zn-Zr板材异常织构的形成及各向异性弱化机理
本文研究了旋转正挤压工艺对Mg-12Gd-4Y-2Zn-0.4Zr板材织构结构发展和力学各向异性的影响。实验材料为φ330 × 1100 mm大尺寸合金,挤压温度为460℃,挤压比为10.18。在旋转正挤压过程中,随着累积应力的增大,合金的平均晶粒尺寸从126.3 μm逐渐减小到10 μm,第二相尺寸也明显减小且分布均匀。同时,在高应力条件下,在非基面连续滑移的驱动下,基面沿主应力轴旋转,形成了与挤压方向(ED)平行的异常织构(c轴平行于挤压方向的异常挤压织构)。动态再结晶(DRX)在异常织构的形成中也起着至关重要的作用,其中DRX过程产生了一定比例具有形核取向的晶粒<; 0001 >;这些晶粒随后的优先生长进一步促进了大多数晶粒在<; 0001 >;方向上的旋转。虽然DRX的成核阶段有助于异常织构的形成,但晶粒的优先生长阶段对异常织构的影响更大。此外,由于强剪切应力的引入,长周期有序堆积(Long Period Stacking Ordered, LPSO)相的屈曲和破碎程度在各个方向上都有所增强,从而减小了不同方向上的形态差异,最终导致力学各向异性的显著减弱。这种力学各向异性的减弱与晶粒尺寸的均匀性和LPSO相形态的差异密切相关。图形抽象
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来源期刊
Metals and Materials International
Metals and Materials International 工程技术-材料科学:综合
CiteScore
7.10
自引率
8.60%
发文量
197
审稿时长
3.7 months
期刊介绍: Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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