EFFECT OF UPSETTING-EXTRUSION-UPSETTING ON THE RECRYSTALLIZATION OF AN Mg-9Gd-4Y-2Zn-0.5Zr ALLOY
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Published:2022-08-16
Issue:4
Volume:56
Page:
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ISSN:1580-3414
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Container-title:Materiali in tehnologije
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language:
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Short-container-title:Mater. Tehnol.
Author:
Peng Zhikang,Leichen Jia,Zhang Guanshi,Zhang Zhimin,Wang Qiang,Yu Jianmin,Xu Jian,Xue Yong
Abstract
In this study, the effect of upsetting-extrusion-upsetting (UEU) on the microstructure of an Mg-9Gd-4Y-2Zn-0.5Zr alloy and on dynamic recrystallization (DRX) was investigated. The results showed that after UEU, DRX occurred in the Mg-9Gd-4Y-2Zn-0.5Zr alloy. Namely, the grain refinement at the cross-sectional edges of UEU specimens was significant, with the grain size being refined from 8.27 µm in the necking region to 6.57 µm. Grain refinement is mainly caused by DRX where the long-period stacking order (LPSO) phase stimulates DRX around the grain boundaries through a particle-stimulated nucleation mechanism. DRX grains play an important role in weakening the texture by offsetting the severely deformed structure of deformed grains.
Publisher
Institute of Metals and Technology
Subject
Metals and Alloys,Polymers and Plastics