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Development of high-strength,low-cost wrought Mg–2.0 mass% Zn alloy with high Mn content

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Progress in Natural Science:Materials International 2016年第6期26卷 630-635页

作者： Fusheng.Pan jianjun Mao Gen Zhang Aitao Tang jia she College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Research Center for Advanced Materials Chongqing Academy of Science and Technology Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China

Mg–Zn–Mn-based alloys have received considerable attention because of their high creep resistance, strength,and good corrosion resistance. The alloying element Mn in Mg–Zn-based alloys is commonly less than 1 wt%. In the present study, the effect of high Mn content(1 wt% and 2 wt%) on the microstructures and mechanical properties of Mg–2Zn–0.3Sr extruded alloy was investigated. The results revealed that the high Mn content significantly increased the ultimate tensile strength, tensile yield strength, compress yield strength, and yield asymmetry of the alloy without affecting its ductility. The dynamically recrystallized(DRXed) grains of Mg–2Zn–0.3Sr were remarkably refined because of the large amount of fine Mn precipitates in the homogenized alloy. The improved strengths were mainly attributed to the fine DRXed grains according to the Hall–Petch effect and to the large amount of spherical and Mn precipitates through the precipitation and dispersion strengthening. The fine DRXed grains and numerous Mn precipitates effectively suppressed the extension twining, substantially enhanced the compress yield strength, and resulted in improved anisotropy.

关键词： Magnesium alloy Mg–Zn alloy Microstructure Ultra-fine grains Second phase Mechanical properties

Research advances of magnesium and magnesium alloys globally in 2023

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Journal of Magnesium and Alloys 2024年第9期12卷 3441-3475页

作者： jia she Jing Chen Xiaoming Xiong Yan Yang Xiaodong Peng Daolun Chen Fusheng Pan National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Department of Mechanical Industrial and Mechatronics EngineeringToronto Metropolitan UniversityTorontoOntario M5B 2K3Canada

Magnesium materials have attracted the attention of many researchers,and the related research is *** article summarizes the advance in the research and development of magnesium materials globally in 2023 from bibliometric and scientific *** than 4680 articles on Mg and its alloys were published and indexed in the Web of Science(WoS)Core Collection database last *** bibliometric analyses show that the traditional structural Mg alloys,functional Mg materials,and corrosion and protection of Mg alloys are still the main research ***,this review paper mainly focuses on the research progress of Mg cast alloys,Mg wrought alloys,bio-magnesium alloys,Mg-based energy storage materials,corrosion and protection of Mg alloys in *** addition,future research directions are proposed based on the challenges and obstacles identified throughout this review.

关键词： Magnesium alloys Bibliometrics Cast mg alloys Wrought mg alloys Bio-magnesium alloys Mg-based energy storage materials Corrosion and protection of mg alloys

Accelerated design of high-performance Mg-Mn-based magnesium alloys based on novel bayesian optimization

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Journal of Magnesium and Alloys 2024年第2期12卷 750-766页

作者： Xiaoxi Mi Lili Dai Xuerui Jing jia she Bjørn Holmedal Aitao Tang Fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Southwest Technology and Engineering Research Institute Chongqing 400039China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Department of Materials Science and Engineering Norwegian University of Science and Technology(NTNU)Trondheim 7051Norway

Magnesium(Mg),being the lightest structural metal,holds immense potential for widespread applications in various *** development of high-performance and cost-effective Mg alloys is crucial to further advancing their commercial *** the rapid advancement of machine learning(ML)technology in recent years,the“data-driven''approach for alloy design has provided new perspectives and opportunities for enhancing the performance of Mg *** paper introduces a novel regression-based Bayesian optimization active learning model(RBOALM)for the development of high-performance Mg-Mn-based wrought *** employs active learning to automatically explore optimal alloy compositions and process parameters within predefined ranges,facilitating the discovery of superior alloy *** model further integrates pre-established regression models as surrogate functions in Bayesian optimization,significantly enhancing the precision of the design *** RBOALM,several new high-performance alloys have been successfully designed and ***,after mechanical property testing of the designed alloys,the Mg-2.1Zn-2.0Mn-0.5Sn-0.1Ca alloy demonstrates exceptional mechanical properties,including an ultimate tensile strength of 406 MPa,a yield strength of 287 MPa,and a 23%fracture ***,the Mg-2.7Mn-0.5Al-0.1Ca alloy exhibits an ultimate tensile strength of 211 MPa,coupled with a remarkable 41%fracture elongation.

关键词： Mg-Mn-based alloys High-performance Alloy design Machine learning Bayesian optimization

Influence of ferrum film by FCVA deposition technique on properties of WE43 magnesium alloy

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Journal of Rare Earths 2024年第12期42卷 2332-2340,I0005页

作者： Zijin Xiao Tao He Xuhui Liu Yilong Dai jia she Yuwen jiang Fugang Qi Xiaoping Ouyang School of Materials Science and Engineering Xiangtan UniversityXiangtan411105China Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education Xiangtan UniversityXiangtan411105China College of Materials Science and Engineering Chongqing UniversityChongqing400045China Zhuhai People's Hospital(Zhuhai Clinical Medical College of Jinan University) Zhuhai519070China

WE43 alloy was successfully coated with ferrum(Fe)films of varying thicknesses using filtered cathode vacuum arc *** physical phase composition,surface morphology,corrosion resistance and mechanical properties of the films were extensively *** results demonstrate that a deposition time of 20 min for Fe ions exhibits minimal defects and low surface *** to the WE43 substrate,the Fe20 alloy exhibits lower Icorr values at 81μA/cm^(2),indicating enhanced corrosion *** experiments further confirm the superior integrity of the Fe20 film compared to other coated alloys ***,among all deposited modified alloys,Fe20 demonstrates significantly improved mechanical properties with its hardness and elastic modulus being three times higher than those of WE43,providing better wear resistance.

关键词： Magnesium alloy Filtered cathode vacuum arc technology Corrosion resistance Mechanical properties Rare earths

Effect of Al on microstructure and mechanical properties of as-extruded Mg–1Mn alloy sheet

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Progress in Natural Science:Materials International 2020年第3期30卷 402-409页

作者： Shida Ma Aitao Tang Peng Peng Geng Zhang Zhengwen Yu jia she Fusheng Pan Material Science and Engineering College Chongqing University School of Stomatology Zunyi Medical University National Engineering Research Center for Magnesium Alloy Chongqing University

The effect of Al addition on microstructure and mechanical properties of hot extruded Mg–1 Mn alloy sheet was investigated. The results revealed that the dynamic recrystallization was promoted by increasing Al content. The ultimate tensile strength and yield strength of the alloy increased with the increase of Al content. The Mg–9 Al–1 Mn alloy exhibited the highest strength, with tensile strength of 308 MPa, 307 MPa, 319 MPa, yield strength of 199 MPa, 207 MPa, 220 MPa and the elongation of 20.9%, 20.1%, 19.2% in 0°, 45°, 90°, *** high strength was mainly attributed to the formation of fine dynamically recrystallized grains and large amounts of the second phase. The strengthening mechanism of the alloys was explained.

关键词： Magnesium alloy Microstructure Mechanical properties Mg–Al–Mn

Microstructures and mechanical properties of as-extruded Mg–5Sn–1Zn–xAl(x=1, 3 and 5) alloys

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Progress in Natural Science:Materials International 2015年第4期25卷 267-275页

作者： jia she Fusheng Pan Huanhuan Hu Hucheng Pan Aitao Tang Kai Song Zhengwen Yu Suqin Luo College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Academy of Science and Technology

As-extruded Mg–5Sn–1Zn–xAl alloys(x=1, 3, and 5) were fabricated by hot extrusion. The experimental results revealed that the yield strength of alloys initially decreased and then increased with the increase of Al content. These changes were mainly attributed to the difference in crystallographic texture and volume fractions of second phases. The ultimate tensile strength, yield strength, and elongation of the alloys were greater than 310 MPa, 227 MPa, and 11%, respectively. The strain hardening ability of the alloys was also discussed.

关键词： As-extruded Mg alloys Mg–Sn–Al–Zn Mechanical properties Texture

Improved mechanical proprieties of“magnesium based composites”with titaniume-aluminum hybrids

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Journal of Magnesium and Alloys 2015年第1期3卷 1-9页

作者： Muhammad Rashad Fusheng Pan Muhammad Asif jia she Ahsan Ullah College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Chongqing Academy of Science and Technology ChongqingChongqing 401123China School of Materials Science and Engineering Dalian University of TechnologyDalian 116024China Department of Physics Quaid-i-Azam UniversityIslamabad 46000Pakistan

In this study,the effect of micron-sized titanium and aluminum addition on the microstructural,mechanical and work-hardening behavior of pure Mg is *** Mg reinforced with 10%Ti and 10%Ti-1%Al particulates were synthesized through semi-powder metallurgy route followed by hot ***-powder metallurgy appears to be promising approach for the synthesis of Mg based composite,as it is free of ball *** results indicate that the direct addition of micron-sized 10wt.%titanium particulates to pure Mg,caused an improvement in elastic modulus,0.2%yield strength,ultimate tensile strength,and failure strain(+72%;+41%;+29%;and+79%respectively).The addition of micron-sized 10wt.%titanium particles along with 1.0wt.%Al particles to pure Mg,resulted in an enhancement in elastic modulus,0.2%yield strength,ultimate tensile strength,and failure strain(+74%;+56%;+45%;and+241%respectively).Besides tensile test,Vickers hardness and work-hardening behavior of prepared composites were also *** failure strain of Mg-10Ti-1Al composite can be attributed to the better compatibility of Ti particulates with Mg due to presence of alloying element Al.

关键词： Mechanical properties Microstructure Powder metallurgy method Metal matrix composite

Effects of Chronic Administration of Melatonin on Spatial Learning Ability and Long-term Potentiation in Lead-exposed and Control Rats

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Biomedical and Environmental Sciences 2009年第1期22卷 70-75页

作者： XIU-JING CAO MING WANG WEI-HENG CHEN DA-MIAO ZHU jia-QI she DI-YUN RUAN School of Life Science University of Science and Technology of China Hefei 230027 Anhui China Department of Maternal and Child Health Anhui Medical University Hefei 230032 Anhui China

Objective To explore the changes in spatial learning performance and long-term potentiation （LTP） which is recognized as a component of the cellular basis of learning and memory in normal and lead-exposed rats after administration of melatonin （MT） for two months. Methods Experiment was performed in adult male Wistar rats （12 controls, 12 exposed to melatonin treatment, 10 exposed to lead and 10 exposed to lead and melatonin treatment）. The lead-exposed rats received 0.2% lead acetate solution from their birth day while the control rats drank tap water. Melatonin （3 mg/kg） or vehicle was administered to the control and lead-exposed rats from the time of their weaning by gastric gavage each day for 60 days, depending on their groups. At the age of 81-90 days, all the animals were subjected to Morris water maze test and then used for extracellular recording of LTP in the dentate gyrus （DG） area of the hippocampus in vivo. Results Low dose of melatonin given from weaning for two months impaired LTP in the DG area of hippocampus and induced learning and memory deficit in the control rats. When melatonin was administered over a prolonged period to the lead-exposed rats, it exacerbated LTP impairment, learning and memory deficit induced by lead. Conclusion Melatonin is not suitable for normal and lead-exposed children.

关键词： Melatonin Lead Learning Memory Long-term potentiation (LTP)

Microstructures and mechanical properties of titanium-reinforced magnesium matrix composites: Review and perspective

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Journal of Magnesium and Alloys 2022年第9期10卷 2311-2333页

作者： Hong Yang Xianhua Chen Guangsheng Huang jiangfeng Song jia she Jun Tan Kaihong Zheng Yiming Jin Bin jiang Fusheng Pan National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Institute of New Materials Guangdong Academy of SciencesGuangzhou 510650China Southwest Technology and Engineering Research Institute Chongqing 400039China

Currently, many gratifying signs of progress have been made in magnesium(Mg) matrix composites(MMCs) by virtue of their high mechanical properties both at room and elevated temperatures. Although the commonly used reinforcements in MMCs are ceramic particles,they often provide improved yield and ultimate stresses by a significant loss in ductility. Therefore, hard metallic phases were introduced as alternative candidates for the manufacturing of MMCs, especially titanium(Ti). It has a high melting point, high Young’s modulus, high plasticity, low level of mutual solubility with Mg matrix, and closer thermal expansion coefficient to that of Mg metal than that of ceramic particles. It is highly preferable to provide both high ultimate stress and ductility in Mg matrix. However, many critical challenges for the fabrication of Ti-reinforced MMCs remain, such as Ti’s homogeneity, low recovery rate, and the optimization of interfacial bonding strength between Mg and Ti, etc. Meanwhile, different fabrication methods have various effects on the microstructures, mechanical properties, and the interfacial strength of Ti-reinforced MMCs. Hence, this review placed emphasis on the microstructural characteristics and mechanical properties of Ti-reinforced MMCs fabricated by different techniques. The influencing factors that govern the strengthening mechanisms were systematically compared and discussed. Future research trends, key issues, and prospects were also proposed to develop Ti-reinforced MMCs.

关键词： Magnesium matrix composites Ti Microstructures Mechanical properties Fabrication techniques