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21 results on '"Jia, Leichen"'

10. EFFECT OF UPSETTING-EXTRUSION-UPSETTING ON THE RECRYSTALLIZATION OF AN Mg-9Gd-4Y-2Zn-0.5Zr ALLOY

Author

Zhikang Peng, Jia Leichen, Guanshi Zhang, Zhimin Zhang, Qiang Wang, Jianmin Yu, Jian Xu, and Yong Xue

Subjects
Polymers and Plastics, Metals and Alloys
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.

Published
2022

11. Vpliv hitrosti ohlajanja na mikrostrukturo in mehanske lastnosti raztopno žarjene zlitine Mg-9Gd-4Y-2Zn-0,5Zr

Author

Wang, Zixuan, Jia, Leichen, Zheng, Jie, Zhang, Zhimin, Yu, Jianmin, Zhao, Xi, and Xue, Yong

Subjects
solution treatment, Polymers and Plastics, microstructure, Metals and Alloys, mikrostruktura, cooling rate, hitrost ohlajanja, mechanical properties, raztopno žarjenje, udc:669-153.6, mehanske lastnosti
Abstract

Different cooling rates, such as room temperature water cooling (WQ), furnace cooling (FC), and water cooling + furnace cooling (FC +WQ), were introduced to study the effect on the solution-treated Mg-9Gd-4Y-2Zn-0.5Zr (w/%) alloy microstructure and mechanical properties. The grain size decreases as the cooling rate increases. With the lengthening of the cooling process time, the LPSO phase had enough time to nucleate and diffuse, the LPSO (long-period stacking order) phase filled the whole matrix crystal grains at the same time. In the process of furnace cooling and water cooling, the brightness of the LPSO phase was different, so it could be seen that the cooling rate would affect the contrast and morphology of the LPSO phase. The tensile yield strengths of the samples cooled with the furnace were better than those of the water-cooled samples, but their ultimate tensile strength and elongation to failure were poor. The fracture modes of the samples under different cooling rates were all subject to cleavage fracture, and the number and area of the cleavage planes and cleavage steps increased with the decrease of cooling speed, and the tearing area decreased, resulting in poor ultimate tensile strength and stretchability.

Published
2022

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