Article
Materials Science, Multidisciplinary
Beibei Dong, Zhimin Zhang, Jianmin Yu, Mu Meng, Yong Xue, Huifang Zhang, Xi Zhao, Xianwei Ren, Shaobin Bai
Summary: This paper comprehensively investigates the microstructure evolution and mechanical properties of industrial-scale Mg alloys. The results reveal heterogeneous microstructure and anisotropic texture and mechanical properties of the RUEed samples. The edge region along the extrusion direction shows superior tensile strength due to smaller grain size and higher area fraction of dynamic recrystallized grains.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Guoqin Wu, Zhaocan Li, Jianmin Yu, Hongbing Hu, Yali Duan, Beibei Dong, Zhimin Zhang
Summary: The texture evolution mechanism of Mg-13.1Gd-3.9Y-2Zn-0.4Zr (wt%) alloys during reciprocating upsetting extrusion and subsequent heat treatment was investigated. The influence of deformation passes on texture weakening and deformation mechanism was discussed. The results showed that the basal texture intensity decreased with increased deformation passes and significantly decreased after T6 heat treatment. The anisotropy of the alloys was maintained after T5 treatment and eliminated after T6 treatment.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zeru Wu, Jianmin Yu, Ziwei Zhang, Hongbing Hu, Zhimin Zhang
Summary: The static recrystallization behavior of a deformed Mg-13.14Gd-3.86Y-2.0Zn-0.39Zr alloy after different annealing treatments was investigated. The degree of recrystallization increased with higher annealing temperatures. The main mechanism for recrystallized grains formation was the transformation of low-angle grain boundaries into high-angle grain boundaries. The annealing treatment also resulted in a decrease in dislocation density and average grain size. Furthermore, the precipitation behavior of the Mg5(Gd,Y) phase changed from grain boundaries to inside the grains. The annealing treatment consumed the LPSO phases and caused a decrease in the basal texture strength of the alloy.
Article
Nanoscience & Nanotechnology
Dongdong Zhang, Chuming Liu, Shunong Jiang, Yonghao Gao, Yingchun Wan, Zhiyong Chen
Summary: This study investigates the effects of extrusion temperature and extrusion ratio on the microstructure, precipitates, and mechanical properties of Mg-7.5Gd-1.5Y-0.4Zr-0.5Ag (wt.%) alloy. The results show that the highest strength is achieved in the sample extruded at a temperature of 420 degrees C and an extrusion ratio of 9, due to texture strengthening, bimodal structure, and precipitate strengthening. After peak aging, the sample exhibits improved strength and ductility. The findings of this study provide new insights for the preparation of high-performance Mg alloys by combining multiple strengthening mechanisms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xinyu Ren, Xinglong An, Song Ni, Yi Huang, Min Song
Summary: This study investigates the microstructural and hardness evolutions of an Mg-5.91Gd-3.29Y-0.54Zr alloy during high-pressure torsion (HPT). The results show that deformation twinning plays a crucial role in the grain subdivision process, with finer multiple twins formed in the area subjected to large plastic strain. Moreover, the maximum hardness obtained from this method is much higher than that achieved from other traditional plastic deformation methods.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Jingjing Jia, Zhimin Zhang, Beibei Dong
Summary: This study comparatively investigated the effects of intermediate annealing and intermediate annealing subsequent aging treatment on an Mg-9Gd-4Y-2Zn-0.5Zr alloy. It was found that the intermediate annealing treatment resulted in the highest dynamic recrystallization (DRX) grains and the largest average DRXed grain size. On the other hand, the intermediate annealing subsequent peak-aging treatment led to significantly smaller DRXed grains. The UAAE sample exhibited excellent strength-ductility synergy with higher ultimate tensile strength (UTS) and failure elongation (EL) compared to the UE sample.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Zexi Gao, Chuming Liu, Shunong Jiang, Yonghao Gao, Yingchun Wan, Zhiyong Chen
Summary: The formation mechanism of abnormal texture and strengthening mechanisms in the extruded Mg-Gd-Y-Nd-Zr alloy are investigated. It is found that the presence of rare-earth elements plays a crucial role in the formation of abnormal texture, and solid solution strengthening has a significant impact on the stability of the alloy's mechanical properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Shaoyuan Lyu, Guodong Li, Ruixiao Zheng, Wenlong Xiao, Yuanding Huang, Norbert Hort, Minfang Chen, Chaoli Ma
Summary: In this study, an ultrafine-grained Mg-RE alloy was successfully fabricated by simple hot extrusion, and the roles of nano-precipitates and alloying elements in inhibiting the growth of recrystallized grains were investigated. The results suggest that high tension-compression symmetry in Mg alloys can be achieved through grain refinement and texture randomization.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xin Tong, Guohua Wu, Liang Zhang, Wencai Liu, Wenjiang Ding
Summary: This study explored the feasibility of Zr alloying in sand-cast GW83 alloy at a low temperature by applying ZrCl4, which resulted in higher Zr yield compared to using Mg-Zr master alloy. The interaction process between ZrCl4 and Mg melt, as well as the grain refinement mechanisms, were systematically studied. The addition of ZrCl4 led to a decrease in average grain size due to heterogeneous nuclei of Zr particles and constitutional supercooling provided by solute Zr, however, a higher addition of ZrCl4 resulted in the generation of RECl3 inclusions that degraded the mechanical properties of the alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Yali Duan, Jianmin Yu, Beibei Dong, Huifang Zhang, Mu Meng, Mei Cheng, Zhimin Zhang, Baohong Zhang, Hongyuan Hao, Ping Xu, Huiling Liu
Summary: Rotating backward extrusion (RBE) is a severe plastic deformation (SPD) method used to produce cylindrical components with very large strain by a single pass. The cup-shaped sample formed by RBE exhibited a typical gradient microstructure, with the average grain size decreasing along the radial direction due to different strains and strain rates in different regions. The center region showed the highest deformation and the edge region exhibited the lowest deformation in the RBEed sample.
Article
Chemistry, Physical
Jingqi Zhao, Haoshan Guo, Tengteng Luo, Chunxiang Zhang, Junting Luo
Summary: The grain refinement mechanism of a fine-grained Mg-8.59Gd-3.85Y-1.14Zn-0.49Zr alloy during multi-directional forging was investigated. It was found that dynamic recrystallization and the pinning effect of beta phases were the main mechanisms for grain refinement, while discontinuous dynamic recrystallization and continuous dynamic recrystallization had different effects on the growth of original and new grains. The deformation temperature had a greater impact on grain refinement compared to the strain rate. Multi-directional forging also weakened the basal texture, resulting in a microstructure with multiple textured components.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Ming Yuan, Chao He, Jun Zhao, Huabao Yang, Yan Song, Bin Lei, Xiaoying Qian, Zhihua Dong, Qian Li, Bin Jiang, Fusheng Pan
Summary: The Mg-2.6Sm-1.3Gd-0.6Zn-0.5Zr (wt.%) alloy was prepared by metal mold casting and hot extrusion, showing an age-hardening response at 200 degrees C with good mechanical properties. The main strengthening mechanisms of the investigated alloy are fine-grain strengthening, solid solution strengthening, and precipitate strengthening.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Rui Han, Leichen Jia, Zhimin Zhang, Qiang Wang, Jianmin Yu, Jian Xu, Yong Xue
Summary: The study discussed the effect of annealing treatment on the microstructure and hardness of Mg-9Gd-4Y-2Zn-0.5Zr alloy. With increasing annealing temperature, grain abnormally grows. Under the condition of 430 degrees C x 5 h, the recrystallization performance of the alloy is the best.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Metallurgy & Metallurgical Engineering
Wenlong Xu, Jianmin Yu, Leichen Jia, Chang Gao, Zhan Miao, Guoqin Wu, Guojun Li, Zhimin Zhang
Summary: This study investigates the grain refinement of a Mg-9Gd-3Y-2Zn-0.5Zr alloy using severe plastic deformation (SPD) technique and its influence on the mechanical properties and wear behavior of the alloy. The results show that increasing the number of reciprocating upsetting-extrusion (RUE) passes leads to obvious grain refinement effect and even distribution of the second phase in the alloy. The mechanical properties of the alloy and the degree of RUE exhibit a positive correlation trend, which can be attributed to the grain refinement, uniform distribution of the second phase, and texture weakening.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Weidong Qiao, Chao Liu, Zhimin Zhang, Yong Xue
Summary: In this study, a novel large height-to-diameter ratio upsetting-extrusion process was used to deform Mg-Gd-Y-Zn-Zr alloy bars. The results showed that a lower extrusion temperature favored the precipitation of large particles of Mg5(RE) phase and refined the grains, leading to an increase in recrystallization fraction and improved mechanical properties of the alloy. Texture strengthening and dislocation strengthening were the main contributors to the mechanical properties, and the presence of coarse grains accommodated deformation and enabled high elongation.
Article
Chemistry, Physical
Guanshi Zhang, Zhimin Zhang, Yue Du, Zhaoming Yan, Xin Che
Article
Chemistry, Physical
Guanshi Zhang, Zhimin Zhang, Xubin Li, Zhaoming Yan, Xin Che, Jianmin Yu, Yingze Meng
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Chemistry, Physical
Guanshi Zhang, Zhimin Zhang, Yingze Meng, Zhaoming Yan, Xin Che, Xubin Li
Article
Chemistry, Physical
Guanshi Zhang, Yingze Meng, Fafa Yan, Zhi Gao, Zhaoming Yan, Zhimin Zhang
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Chemistry, Physical
Huiling Liu, Yingze Meng, Huisheng Yu, Wenlong Xu, Siyang Zhang, Leichen Jia, Guoqin Wu
Article
Materials Science, Multidisciplinary
Leichen Jia, Jianmin Yu, Wenlong Xu, Guoqin Wu, Qing Xia, Zhimin Zhang
Summary: This study investigates the effects of long-period stacking order (LPSO) phases on the dynamic recrystallization (DRX) process in Mg-Gd-Y-Zn-Zr (GWZ) alloy and Mg-Gd-Y-Zr (GW) alloy, and finds that GWZ alloy exhibits better grain refinement and texture strength compared to GW alloy, while its tensile strength is higher but elongation is lower.
MATERIALS RESEARCH EXPRESS
(2021)
Review
Materials Science, Multidisciplinary
Wenlong Xu, Jianmin Yu, Leichen Jia, Guoqin Wu, Zhimin Zhang
Summary: At 350 degrees C, the Mg-13Gd-4Y-2Zn-0.5Zr alloy exhibits the coordinated effects of multiple deformation mechanisms under different equivalent strain rates, including lamellar LPSO phases kinking, dynamic recrystallization (DRX), and twinning, weakening the basal texture.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Rui Han, Leichen Jia, Zhimin Zhang, Qiang Wang, Jianmin Yu, Jian Xu, Yong Xue
Summary: The study discussed the effect of annealing treatment on the microstructure and hardness of Mg-9Gd-4Y-2Zn-0.5Zr alloy. With increasing annealing temperature, grain abnormally grows. Under the condition of 430 degrees C x 5 h, the recrystallization performance of the alloy is the best.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Physical
Guoqin Wu, Jianmin Yu, Leichen Jia, Wenlong Xu, Beibei Dong, Zhimin Zhang, Biying Hao
