Article
Materials Science, Multidisciplinary
Jianzhong Gao, Xiangpeng Zhang, Hongxia Wang, Lifei Wang, Hang Li, Hua Hou, Xiaoping Luo, Kwang Seon Shin
Summary: The effect of Zn addition on the microstructure and mechanical properties of Mg-9Gd-2Nd-0.5Zr alloys during equal channel angular pressing was investigated. The addition of Zn resulted in the formation of uniformly distributed dynamically recrystallized grains with an average size of 3.0 +/- 0.3 μm in the Mg-9Gd-2Nd-1.6Zn-0.5Zr alloy. The alloy exhibited excellent mechanical properties compared to the Mg-9Gd-2Nd-0.5Zr alloy. This can be attributed to the strengthening and toughening effect of the LPSO phase, which improved the strength and plasticity of the alloy.
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
Metallurgy & Metallurgical Engineering
He Xie, Guohua Wu, Xiaolong Zhang, Zhongquan Li, Wencai Liu, Liang Zhang, Xin Tong, Baode Sun
Summary: The microstructure, aging behavior, and mechanical properties of cast Mg-3Nd-3Gd-xZn-0.5Zr (x = 0, 0.5, 0.8, 1 wt%) alloys were investigated. The addition of Zn led to the formation of Zn-Zr particles with different morphologies during solution treatment, influencing the precipitation behavior and subsequently the mechanical properties of the alloys. The best tensile properties were achieved in the alloy with 0.5 wt% Zn addition, with a yield strength of 179 MPa, ultimate tensile strength of 301 MPa, and elongation of 5.3% in peak-aged conditions.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Z. K. Ji, X. G. Qiao, W. T. Sun, L. Yuan, F. G. Cong, G. J. Wang, M. Y. Zheng
Summary: The effects of bimodal microstructure on the tensile properties and fracture toughness of Mg-9Gd-4Y-0.5Zr alloys were investigated. The results showed that the bimodal grain structure exhibited better yield strength and plane strain fracture toughness compared to the fully dynamic recrystallized (DRXed) microstructure. The bimodal grain structure had a higher tensile strength due to hetero-deformation induced (HDI) strengthening effect and strong basal texture. In addition, it had a stronger strain hardening capacity and larger hardened region, leading to improved fracture toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Jingjing Jia, Mu Meng, Zhimin Zhang, Xue Yang, Genxing Lei, Honglei Zhang
Summary: Deep cryogenic treatment resulted in the precipitation of Mg5RE phases in Mg-9Gd-4Y-2Zn-0.5Zr alloy, leading to higher ultimate tensile strength (UTS) and yield strength (YS). The UTS and YS first increased then decreased with the increasing of soaking time, corresponding to the volume fraction increasing and size-coarsening of Mg5RE precipitates.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Dongmei Pu, Xianhua Chen, Jingfeng Wang, Jun Tan, Jianbo Li, Hong Yang, Bo Feng, Kaihong Zheng, Fusheng Pan
Summary: TiP/VW94 composites were prepared using semi-solid stirring assisted ultrasonic vibration followed by hot extrusion. The addition of Ti particles promoted the precipitation of lamellar long period stacking ordered structure (LPSO) and inhibited the precipitation of block-shaped LPSO during heat treatment. The tensile properties of TiP/VW94 composites were enhanced by load transfer, grain refinement, dislocation strengthening, and the presence of appropriate content and size of lamellar LPSO and RE-rich phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
He Xie, Guohua Wu, Xin Tong, Rui Jiang, Liang Zhang, Wencai Liu, Zhongquan Li
Summary: In this study, the evolution of precipitate microstructure and mechanical properties of a Mg-3Nd-3Gd-0.2Zn-0.5Zr alloy during isothermal aging at 225 degrees C is investigated. The mechanical properties of the alloy show significant differences in three stages of precipitation and growth of different phases.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Zhikang Peng, Leichen Jia, Guanshi Zhang, Zhimin Zhang, Qiang Wang, Jianmin Yu, Jian Xu, Yong Xue
Summary: This study investigates the effect of upsetting-extrusion-upsetting (UEU) on the microstructure of an Mg-9Gd-4Y-2Zn-0.5Zr alloy and dynamic recrystallization (DRX). It was found that DRX occurred in the alloy after UEU, leading to significant grain refinement at the cross-sectional edges. The grain refinement was mainly caused by DRX stimulated by the long-period stacking order (LPSO) phase through a particle-stimulated nucleation mechanism.
MATERIALI IN TEHNOLOGIJE
(2022)
Article
Metallurgy & Metallurgical Engineering
Bing-Yu Qian, Rui-Zhi Wu, Jian-Feng Sun, Jing-Huai Zhang, Le-Gan Hou, Xiao-Chun Ma, Jia-Hao Wang, Hai-Ting Hu
Summary: The evolution of the microstructure and mechanical properties of the alloy system with different Gd content was evaluated. The results show that grains are refined with the increase of Gd content. The main phases are alpha-Mg, beta-Li, AgLi2Mg, and Mg3Gd. The tensile strength first increases and then decreases with the increase of Gd content, reaching a maximum at 4.8 wt% Gd.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
L. P. Yan, Q. A. Li, X. Y. Chen
Summary: The microstructure evolution and dynamic precipitation behavior of Mg-10Gd-4Y-1Sm-0.5Zr alloy during backward hot extrusion were studied. The findings indicated that equiaxed grains transformed into polygonal grains and fine DRX grains were formed along initial deformed grain boundaries. Increased deformation resulted in higher volume fraction of DRX grains, leading to fully DRX extruded microstructure in the hot-extruded sample.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Yangjunfeng Nie, Jie Zheng, Rui Han, Leichen Jia, Zhimin Zhang, Yong Xue
Summary: The thermal deformation behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy was investigated in this study. The alloy exhibited steady-state rheological characteristics and a constitutive equation and deformation activation energy were obtained. The effects of deformation temperature, strain rate, and strain magnitude on peak dissipation efficiency factor and instability range were found to be significant. The optimum deformation temperature and strain rate for this alloy were determined to be 400-480 degrees C and 0.001-0.01 s(-1), respectively.
Article
Metallurgy & Metallurgical Engineering
Jinsheng Ji, Jie Zheng, Leichen Jia, Yong Zhang, Yunfei Jia, Yusha Shi, Heng Zhang, Yong Xue
Summary: The strain-controlled cyclic deformation behavior of Mg-9Gd-4Y-2Zn-0.5Zr with different structures was investigated. The bimodal structure exhibited better performance in fatigue tests due to its higher yield strength.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Huabao Yang, Yanfu Chai, Bin Jiang, Chao He, Junjie He, Qingshan Yang, Ming Yuan
Summary: A novel slope extrusion (SE) approach was used to manufacture AZ31 alloy sheets, and its microstructures, textures, and mechanical properties were compared with those of conventional extrusion (CE). The results showed that SE process achieved significant grain refinement and texture strengthening, leading to improved mechanical properties of the SE sheets compared to the CE sheets.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Chemistry, Physical
Linghao Wang, Azman Jalar, Longhong Dan
Summary: Alloying studies of Mg-Gd system alloys are important for improving alloy properties and reducing Gd content and costs. Nd addition promotes precipitation and enhances heat resistance properties. Low Gd content Mg-7Gd-xNd-0.5Zr (x = 0, 0.5, 2, 3.5 wt%) alloys were prepared and processed by solution aging. The addition of Nd promotes the precipitation of Mg5Gd phase and leads to grain refinement through the generation of a new Mg41Nd5 phase.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Yuanke Fu, Liping Wang, Yicheng Feng, Lei Wang, Sicong Zhao
Summary: The effect of cooling rate on solidification behaviour, microstructure evolution and mechanical properties of Al-refined Mg-9Gd-4Y-1Zn was investigated in this study. A decrease in cooling rate led to an increase in grain size and the smallest grain size (30.57 µm) was observed at a cooling rate of 32.5 degrees C/s. Different phases including lamellar LPSO, block-like Mg-3 (Zn, RE), granular Al2RE and acicular Al2RE were identified. The content of granular Al2RE increased with a decrease in cooling rate, while the content of other phases decreased. The mechanical properties, including ultimate tensile strength, yield strength and elongation, decreased as the cooling rate decreased. The best mechanical properties were achieved at a cooling rate of 32.5 degrees C/s, with values of 228.2 MPa, 158.2 MPa, and 8.8% for UTS, YS, and elongation, respectively.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
