Inclusive anisotropy and texture analyses of AZ91 Mg sheets subjected to various passes of elevated-temperature constrained groove pressing

F Fereshteh-Saniee; S Ghorbanhosseini; A Sonboli

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Inclusive anisotropy and texture analyses of AZ91 Mg sheets subjected to various passes of elevated-temperature constrained groove pressing

机译：Inclusive anisotropy and texture analyses of AZ91 Mg sheets subjected to various passes of elevated-temperature constrained groove pressing

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Constrained groove pressing (CGP) is a kind of sheet severe plastic deformation method suitable for enhancing the strengths of light alloys for various applications such as aerospace and automotive industries. In this research, the annealed AZ91 Mg alloy sheets were subjected to three CGP cycles at 300°C. Subsequently, optical microscopy, scanning electron microscopy, x-ray diffraction, and tensile tests for various directions were performed. Initially, there was a basal texture with a maximum intensity of 3.4 multiple random distribution and several β-Mg_(17)Al_(12)particles as the second phase in the annealed sheet. As an important achievement of employing the CGP operation, the 1-passed sample represented a superior elongation of 35.7%, maximum yield strength of 141.0?MPa, and maximum ultimate tensile strength of 231.0?MPa in the rolling direction. These were mainly due to, the grain refinement, enhancing the fiber texture in the transverse direction, and controlling the basal texture. However, the experimental results revealed that the basal texture during the second and third passes of the operation could not be controlled. The main preferred orientation was changed from ( 06 6 ˉ 1 ) ⊥ ND ( Normal Direction ) fiber for the annealed sheet to ( 0001 ) ⊥ ND fiber for the CGPed sheets. It is also interesting to note that based on an anisotropy analysis, the 1-passed sample was the most isotropic worksheet, making this specimen a suitable blank for secondary metal forming processes, in comparison with the other CGPed samples. Fractography also indicated that the fracture mechanism varied among ductile, brittle, and mixed modes for workpieces subjected to different passes of the process.

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《Proceedings of the Institution of Mechanical Engineers, Part L. Journal of Materials: Design and Application》 |2023年第7期|1638-1650|共13页
作者
F Fereshteh-Saniee; S Ghorbanhosseini; A Sonboli;
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作者单位

Department of Mechanical Engineering;

Department of Materials Engineering and Metallurgy, Faculty of Engineering;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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Constrained groove pressing; AZ91 mg alloy; texture; anisotropy analysis; fracture mechanism;

Inclusive anisotropy and texture analyses of AZ91 Mg sheets subjected to various passes of elevated-temperature constrained groove pressing

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