Article
Materials Science, Multidisciplinary
Hongmin Jia, Mengrui Wang, Sheji Luo
Summary: A novel Mg-Zn-Zr-Y-Cu alloy was fabricated and its corrosion behavior was investigated. The ZWCK6100 alloy exhibited finer grain size, more uniform microstructure, and contained additional CuMgZn and I phase (Mg3Zn6Y) compared to the ZK60 alloy. As a result, the ZWCK6100 alloy showed lower corrosion rate, higher corrosion resistance, and slightly localized corrosion in 3.5 wt-% NaCl solution, indicating that the combined addition of Y and Cu improved the corrosion resistance of Mg alloys.
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Nagasivamuni Balasubramani, Gui Wang, Mark A. Easton, David H. StJohn, Matthew S. Dargusch
Summary: Ultrasonic treatment (UST) can achieve grain refinement in pure Mg and different alloys, with the presence of low superheat and solute helping to reduce temperature dependency, while the addition of suitable particles can further improve the grain refinement effect.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Chemistry, Physical
Quan-xin Shi, Cui-ju Wang, Kun-kun Deng, Yi-dan Fan, Kai-bo Nie, Wei- Wei-Liang
Summary: The present work investigates the impact of bimodal microstructure on the work hardening and softening behaviors of Mg-6Zn-1Gd-0.3Ca alloy. The study also discusses the grain refinement mechanism through EBSD analysis. The results reveal that the work hardening capacity of the alloy increases with the volume fraction of fine recrystallized grains due to increased dislocation storage rate caused by grain coarsening. The stress reduction value in the early stage of deformation is the highest for the alloy with fine recrystallized grains, providing a greater driving force for softening effect. However, the stress reduction values decrease with the increase of fine recrystallized grains in the later stage of deformation. Furthermore, the analysis indicates that dynamic recrystallization plays a significant role in the formation of fine recrystallized grains in the Mg-6Zn-1Gd-0.3Ca alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Kai Zhao, Tong Gao, Huabing Yang, Kaiqi Hu, Guiliang Liu, Qianqian Sun, Jinfeng Nie, Xiangfa Liu
Summary: The addition of TiC nano-particles in high-strength aluminum alloy 7050 leads to significant grain refinement and improved mechanical properties through growth restriction effect and heterogeneous nucleation. The alignment of TiC nano-particles along extrusion direction after subsequent heat treatment contributes to the enhanced tensile properties, ductility, and refined precipitates in the composite. These synergistic effects result in optimized mechanical properties of TiCp/7050 composite, providing new insights for controlling matrix grains of Zr-containing Al alloys and developing low-cost Al matrix composites.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Fangjing Xing, Feng Guo, Juan Su, Xueping Zhao, Huisheng Cai
Summary: The formation of Zr-containing phases during solidification of Mg-Zn-Zr alloy was simulated, and the structure of Zr-containing compounds, Zr solid solution in alpha-Mg, and the grain size of the alloy were measured. The results show that Zr mainly exists in compound form in the alloy, with limited solid solution in alpha-Mg, and plays a role in grain refinement mechanisms.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
Yan Song, Hongxiang Jiang, Lili Zhang, Jie He, Jiuzhou Zhao
Summary: An integrated model combining population dynamics approach and cellular automaton method has been developed to simulate the solidification process of Al-Zn-Mg-Cu alloys. The model is validated by experimental results and applied to calculate microstructure formation details in inoculated alloys, with an empirical formula proposed to predict grain size.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Ning Li, Ting Wang, Liang Zhang, Lixia Zhang
Summary: This study investigates the crack morphology and crystallographic orientation of a specific alloy in additive manufacturing, demonstrating the mechanisms of crack initiation and propagation. The findings highlight that solidification cracks are the most common, with the wide temperature range and grain boundaries being the main factors of cracking susceptibility. Additionally, the LPBF process has an influence on crack initiation and propagation.
MATERIALS CHARACTERIZATION
(2023)
Article
Thermodynamics
Shuqin Luo, Lei Wang, Yang Cao
Summary: The effect of Zr content on the microstructure and solidification behavior of as-cast Mg-3Nd alloy was investigated. It was discovered that adding Zr can effectively improve the microstructure of the Mg-3Nd alloy by transitioning from coarse dendritic structures to finely-grained equiaxed structures. The addition of Zr also decreased the size of the second phase and ensured a more uniform distribution. The optimal amount of Zr for refining the Mg-3Nd alloy was determined to be 0.4%, resulting in a significant reduction in grain size.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Materials Science, Multidisciplinary
Lanbo Li, Tiechui Yuan, Xiaoxing Yuan
Summary: The addition of Si and Zr as reinforcement phases into Al-Zn-Mg-Cu alloy effectively prevents cracking and improves mechanical properties. Si is found to be very effective in eliminating cracks. The average grain size initially decreases and then increases with increasing Zr content, reaching the minimum (13.8 μm) at 1.0 wt%. The trend of hardness, yield strength, tensile strength, and elongation with Zr content is consistent with the average grain size, reaching the maximum (126 HV, 215.7 MPa, 333.5 MPa, and 2.9%) at 1.0 wt% Zr content, which further increases (Hardness 156 HV, Yield strength 273.7 MPa, tensile strength 392.2 MPa, and elongation 4.4%) after T6 treatment. Therefore, the incorporation of Si and Zr is beneficial for the manufacturing of crack-free microstructure and excellent mechanical properties in the Al-Zn-Mg-Cu alloy.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
A. Martin, M. Vilanova, E. Gil, M. San Sebastian, C. Y. Wang, S. Milenkovic, M. T. Perez-Prado, C. M. Cepeda-Jimenez
Summary: The addition of Zr, along with large Al3Zr nucleant particles and nanoscale second phases, significantly enhances the microhardness of the AlZnMgCu alloy, making it exhibit superior mechanical properties compared to the Al7075-T6 aluminum alloy.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Kaijiao Kang, Shunde Jiang, Dayong Li, Dequan Shi
Summary: The effects of pulse current, pulse frequency, magnetic field current, and magnetic field frequency on the solidification microstructure and mechanical properties of Al-Zn-Mg-Cu alloy were investigated. The electromagnetic field and flow field during the solidification process were simulated using COMSOL finite element software. The mechanism of refining the solidification structure of Al-Zn-Mg-Cu alloy was clarified. The optimal parameters for the compound field treatment were determined, resulting in finer grains and higher tensile strength in the alloy.
MATERIALS CHARACTERIZATION
(2023)
Article
Metallurgy & Metallurgical Engineering
Wen Kai, Li Xi-wu, Xiong Bai-qing, Liu Hong-lei, Wang Ying-jun, Li Zhi-hui, Zhang Yong-an, Li Ya-nan
Summary: In this study, scandium was added to an Al-Zn-Mg-Cu-Zr alloy, and the effects of different scandium contents on the microstructure of the alloy were investigated. The results showed that scandium addition can refine the grain size and reduce the content of the AlZnMgCu eutectic phase.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Materials Science, Multidisciplinary
Fenglong Zhai, Liping Wang, Xin Gao, Sicong Zhao, Yicheng Feng, Tao Ma, Rui Fan
Summary: The Al-6.7Zn-2.6Mg-2.0Cu-0.1Zr alloy modified with Sm showed improved mechanical properties at high temperatures. The addition of Sm resulted in refinement of the as-cast structure, finer precipitates after aging, and formation of a new high melting point phase. Tensile test results indicated increased strength in the modified alloy, with improved ductile fracture characteristics at both room temperature and high temperatures.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Chemistry, Physical
Li Zhou, Yajun Luo, Zhenlin Zhang, Min He, Yinao Xu, Yulei Zhao, Sheng Liu, Lijun Dong, Zhifeng Zhang
Summary: Through annular electromagnetic stirring and intercooling, uniform direct chill casting can significantly improve the microstructure and uniform distribution of alloying elements in the billets. Explosive nucleation helps grain refinement, while electromagnetic stirring can suppress the macrosegregation of alloying elements.
Article
Nanoscience & Nanotechnology
Zhi Zhang, Jinghuai Zhang, Jinshu Xie, Shujuan Liu, Yuying He, Ru Wang, Daqing Fang, Wei Fu, Yunlei Jiao, Ruizhi Wu
Summary: The addition of trace Sm can significantly increase the grain boundary segregation concentration in the dilute Mg-Zn-Ca-Mn alloy, improve its yield strength, inhibit grain growth during annealing, and contribute to the design of advanced Mg alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)