Article
Materials Science, Multidisciplinary
Yuandong Liu, Wei Li, Yidan Sun, Linbo Chen, Guoqi Chang, Guisheng Deng
Summary: The gradient microstructure of Mg-Y-Nd-Zr alloy processed by USRP was characterized and analyzed. The mechanism of microstructure evolution and its influence on the alloy's mechanical properties were discussed. The alloy exhibited gradually changing grain size and orientation along the processing depth, with grain refinement and dislocation strengthening contributing to the improvement in strength. The synergistic deformation between the gradient structures was found to be the main reason for the alloy's excellent strength and plasticity matching.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Automation & Control Systems
Nanyang Zhu, Chaoyang Sun, Lingyun Qian, Mingjia Wang, Xintong Li
Summary: This study proposes a new variable circular channel angular extrusion (VCCAE) process for manufacturing magnesium alloy plates with rib-web structure. The feasibility and accuracy of the process are validated through numerical simulations and experiments. The results show that stress and strain distribution in the longitudinal section is highly inhomogeneous, with significant stress concentration at the shear plane. The microstructure in the angular region is more uniform and finer, indicating that severe shear deformation induced by the angular channel promotes deformation uniformity and grain refinement.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Zhi Zhang, Jinghuai Zhang, Jinshu Xie, Shujuan Liu, Yuying He, Kai Guan, Ruizhi Wu
Summary: A new low-alloyed Mg-2Sm-0.8Mn-0.6Ca-0.5Zn alloy is prepared by low-temperature and low-speed extrusion, which exhibits high strength but low ductility. After annealing, the alloy shows both high strength and high ductility due to the effective inhibition of grain growth by grain boundary co-segregation and decreased dislocation density. The evolution of immovable long dislocations towards new grain boundaries is a key factor for the remarkable increase of ductility in the annealed alloy.
SCRIPTA MATERIALIA
(2022)
Article
Engineering, Mechanical
Zhi Zhang, Jinghuai Zhang, Jinshu Xie, Shujuan Liu, Wei Fu, Ruizhi Wu
Summary: By introducing beneficial solute to achieve grain boundary segregation and reducing the critical resolved shear stress (CRSS) ratio, we obtained a Mg-0.3Er alloy with moderate-fine grains and high ductility. This study not only provides an effective way for large-scale development of high ductility Mg alloys at room temperature, but also reveals the origins of ultrahigh ductility by examining the fraction of non-basal slips and the level of grain boundary segregation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Tianxu Zheng, Yaobo Hu, Chao Zhang, Tianshuo Zhao, Fusheng Pan, Aitao Tang
Summary: The high ductility of the Mg-2Gd-0.4Zr alloy at room temperature is attributed to the rare earth texture, higher proportion of non-basal slip, high grain boundary strength, and synergy between twinning and dislocation. Local strain compatibility may also contribute to its high ductility.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Mohammadreza Sadrkhah, Milad Aali Majidabad, Mohsen Mesbah, Alireza Sadeghi, Ghader Faraji
Summary: This study examines the effects of adding different amounts of strontium and parallel tubular channel angular pressing (PTCAP) method on as-cast AZ31 magnesium alloy. The results show that adding strontium can significantly refine the grain size and increase the precipitates fraction. Texture analysis demonstrates that adding more strontium reduces the texture intensity. The shear-punch test reveals that the sample with 0.7 wt.% strontium has the highest shear strength and deformation. Corrosion analysis indicates that the PTCAP specimen with 0.7 wt.% strontium has a promising corrosion rate for corrosion-resistant applications.
Article
Nanoscience & Nanotechnology
Yucheng Zhou, Qun Luo, Bin Jiang, Qian Li, Fusheng Pan
Summary: A new Mg98.3Y1.3Ni0.4 alloy with good strength-ductility synergy, high ultimate tensile strength, and low work hardening rate has been prepared through high temperature homogenization and rolling. The strength increment in the alloy is attributed to refined grains, broken LPSO phases, and high-density geometrically necessary dislocations. The good ductility and low work hardening rate are due to weak basal texture, activation of non-basal slips with high Schmid factors, and annihilation of high-density dislocations.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Yongpeng Tang, Shinichi Inoue, Masaki Mito, Takahiro Masuda, Yuji Higo, Yoshinori Tange, Yasuo Ohishi, Yoshihito Kawamura, Zenji Horita
Summary: This study investigates the effect of high-pressure torsion (HPT) on the microstructure, mechanical properties, electrical conductivity, and ignition temperature of a Mg-6Al-3Ca-0.02Mn-0.008Be (at%) alloy. The HPT-processed samples exhibit high tensile yield strengths of 400 MPa with total elongations of -5%. The high strengthening is attributed to ultrafine grain refinement, high dislocation density, fragmentation of intermetallic particles, and dynamic precipitation of nanosized particles during HPT processing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Daibo Zhu, Qin Zeng, Chao Cao, Yang Liu, Xiaojie Zhou, Gang Zeng, Chenbo Li
Summary: Mg-4.5Al-2.6Zn-0.3Mn sheets with high strength-ductility synergy and low anisotropy were fabricated using extrusion, rolling, and annealing processes. These sheets can be excellent substitutes for commercial AZ31 alloys. The as-annealed sheets have finer grains, lower dislocation density, and weaker basal texture, resulting in higher performance compared to the as-rolled ones.
Article
Nanoscience & Nanotechnology
Nan Xia, Cheng Wang, Yipeng Gao, Zhen-Ming Hua, Chen-Yi Ma, Chun-Feng Du, Hang Zhang, Hong-Min Zhang, Mei-Xuan Li, Min Zha, Hui-Yuan Wang
Summary: In this study, a Mg?1Zn?0.2Zr (ZK10) alloy sheet was prepared by multi-pass hot rolling and annealing, with the addition of dilute Ca to tailor the basal texture and reduce plastic anisotropy. Microstructural characterizations showed improved ductility due to the occurrence of pyramidal c+a slip in the deformed alloys. This work may offer a new strategy for developing wrought Mg alloys with enhanced ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
J. Horky, K. Bryla, M. Krystian, G. Mozdzen, B. Mingler, L. Sajti
Summary: Mg alloys are suitable for biodegradable osteosynthesis implants, but high degradation rates and low strength values are drawbacks. A lean Mg-Zn-Ca alloy processed by D-ECAP shows desirable mechanical properties and low degradation rate, which can be tailored according to the requirements of the final application.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Zhong-Zheng Jin, Min Zha, Hai-Long Jia, Pin-Kui Ma, Si-Qing Wang, Jia-Wei Liang, Hui-Yuan Wang
Summary: The utilization of SRS combined with HPR process has led to an increase in elongation with maintained tensile strength in Mg-6Zn-0.2Ca alloy. The refined grain structure and eutectic phase, along with the presence of excessive Ca solute atoms, contribute to the enhanced ductility and strain-hardening ability of the alloy.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Yong-Kang Li, Min Zha, Hai-Long Jia, Si-Qing Wang, Hong-Min Zhang, Xiao Ma, Teng Tian, Pin-Kui Ma, Hui-Yuan Wang
Summary: By using hard plate rolling process, the volume fraction of fine grains in bimodal grain structure can be effectively tailored, resulting in optimized strength and ductility with a high ultimate tensile strength and decent uniform elongation. The desired bimodal grain structure can be achieved by co-regulating particle effects and inhibiting the growth of recrystallized grains.
JOURNAL OF MAGNESIUM AND ALLOYS
(2021)
Article
Nanoscience & Nanotechnology
Mingzhe Bian, Xinsheng Huang, Yasumasa Chino
Summary: In the solution treated state, Ag and Ca atoms segregate to grain boundaries, promoting the early formation of GB precipitates compared to the grain interior. Prolonged aging results in the growth of GB precipitates, which serve as preferred initiation sites for microcracks.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Review
Metallurgy & Metallurgical Engineering
Guohua Wu, Xin Tong, Cunlong Wang, Rui Jiang, Wenjiang Ding
Summary: High-performance cast magnesium rare-earth (Mg-RE) alloys play a crucial role in various fields, and controlling grain size and distribution is essential. This article reviews the recent advances and proposed future developments in the grain refinement of cast Mg-RE alloys, providing insights for the design of grain refinement techniques and the selection of processing parameters.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
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)
Article
Materials Science, Multidisciplinary
Jinshu Xie, Jinghuai Zhang, Zhi Zhang, Qiang Yang, Kai Guan, Yuying He, Ru Wang, Hao Zhang, Xin Qiu, Ruizhi Wu
Summary: Formation of solute-enriched stacking faults (SESFs) and their transformation into long period stacking ordered (LPSO) phase in Mg alloys have been achieved in this study. The role and advantages of SESFs and LPSO phase were confirmed by experimental observations. These findings are significant for the development of high-strength and anti-corrosion Mg alloys.
Article
Oncology
Ranxu Wang, Conghui Jia, Nannan Zheng, Shujuan Liu, Zhilin Qi, Ruiwen Wang, Lu Zhang, Yumei Niu, Shuang Pan
Summary: This study explores the clinical application of a Titanium dioxide/nano-hydroxyapatite (TiO2-HAP) composite combined with a dental curing lamp, which can inhibit dental plaque biofilm formation by Streptococcus mutans (S. mutans) and promote enamel surface remineralization.
PHOTODIAGNOSIS AND PHOTODYNAMIC THERAPY
(2023)
Article
Metallurgy & Metallurgical Engineering
Jinshu Xie, Lele Wang, Jinghuai Zhang, Liwei Lu, Zhi Zhang, Yuying He, Ruizhi Wu
Summary: The effects of fine-grain structure on the mechanical and anti-corrosion properties of magnesium alloys were studied, achieving high strength, good elongation, and low corrosion rate. The weak anodic nature of the nano-lamellar structure was identified for the first time, showing excellent corrosion resistance. Designing magnesium alloys with high mechanical and anti-corrosion properties was proposed through the construction of a homogeneous potential strengthening microstructure.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Jinshu Xie, Zhi Zhang, Shujuan Liu, Jinghuai Zhang, Jun Wang, Yuying He, Liwei Lu, Yunlei Jiao, Ruizhi Wu
Summary: Two new low-alloyed Mg-2RE-0.8Mn-0.6Ca-0.5Zn alloys with excellent extrudability and superior mechanical properties, especially high-temperature strength, have been developed.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Engineering, Mechanical
Zhi Zhang, Jinghuai Zhang, Jinshu Xie, Shujuan Liu, Wei Fu, Ruizhi Wu
Summary: By introducing beneficial solute to achieve grain boundary segregation and reducing the critical resolved shear stress (CRSS) ratio, we obtained a Mg-0.3Er alloy with moderate-fine grains and high ductility. This study not only provides an effective way for large-scale development of high ductility Mg alloys at room temperature, but also reveals the origins of ultrahigh ductility by examining the fraction of non-basal slips and the level of grain boundary segregation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Multidisciplinary
Jinshu Xie, Jinghuai Zhang, Shujuan Liu, Zihao You, Zhi Zhang, Tengfei Zhao, Xiaobo Zhang, Ruizhi Wu
Summary: A high-performance Mg-10Gd-4Dy-1.5Ag-1Zn-0.5Zr (wt.%, EQ142X) alloy was designed using multi-element composite addition, resulting in high yield strength (approx. 396 MPa) and ultimate tensile strength (approx. 451 MPa) after hot extrusion and ageing. The high strength is attributed to fine grains and nano-precipitates, especially beta' and gamma nano-precipitates, which act as the main strengthening phases. The introduction of nano-precipitates network into the fine-grained structure is proposed as an effective strategy for developing high-strength Mg alloys.
Article
Materials Science, Multidisciplinary
Zhi Zhang, Jinshu Xie, Jinghuai Zhang, Shujuan Liu, Ruizhi Wu, Xiaobo Zhang
Summary: This study presents a new hot-extruded + annealed alloy with a good combination of yield strength and formability potential due to the formation of nano precipitates and texture-weakened heterogeneous grains. The introduction of nano precipitates enhances the alloy's strength with minimal detrimental effect on ductility. The formation of a heterogeneous-grained structure with a weak basal texture is primarily attributed to the segregation of Sm, Zn, and Ca elements at the grain boundaries. This structure promotes additional hetero-deformation induced hardening and provides a large work-hardening capacity, resulting in high elongation. Introducing nano precipitates and texture-weakened heterogeneous grains offers a new strategy to improve yield strength and formability potential.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Zhi Zhang, Jinshu Xie, Jinghuai Zhang, Hao Dong, Shujuan Liu, Xiaobo Zhang, Jun Wang, Ruizhi Wu
Summary: In this study, trace Er addition was found to synergistically improve the mechanical and anti-corrosion properties of the Mg-1.4Al-0.4Mn-0.4Ca0.3Er alloy. The corrosion rate of the alloy was reduced by one order of magnitude compared to the reference alloy. This improvement was attributed to the reduction in dynamic recrystallization and the formation of stronger strengthening phase particles. The addition of Er also promoted the formation of a less noble Al8Mn4Er phase with effective Fe trapping ability and induced dislocation segregation, leading to reduced micro-galvanic corrosion.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Jinshu Xie, Jinghuai Zhang, Zhi Zhang, Zijian Yu, Zhihao Xu, Ru Wang, Daqing Fang, Xiaobo Zhang, Xiaoru Zhang, Ruizhi Wu
Summary: Understanding the corrosion mechanism of magnesium (Mg) alloys and controlling the potential fluctuation are crucial for developing high-strength corrosion-resistant Mg alloys. This study reveals that the presence of different microstructures in Mg alloys can affect the corrosion rate and film formation. The structurally enhanced microstructure can reduce the potential fluctuation, leading to improved corrosion resistance.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Review
Biochemistry & Molecular Biology
Liangnan Tong, Danqing Liu, Zhiyue Cao, Nannan Zheng, Chenchen Mao, Shujuan Liu, Liangcan He, Shaoqin Liu
Summary: Gene therapy using siRNA has gained much attention for its unique mechanism of action, non-toxicity, and good tolerance, allowing for targeted killing of cancer cells without harming healthy tissues. Compared to traditional treatments, siRNA therapy has fewer side effects and can provide long-term and even curative effects. It has also shown promise in the treatment of cardiovascular diseases, gastrointestinal diseases, and hepatitis B.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)