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Role of slip and {10-12} twin on the crystal plasticity in Mg-RE alloy during deformation process at room temperature

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Journal of Materials Science & Technology 2021年第21期80卷 279-296页

作者： Yunwei Gui yujie cui Huakang Bian Quanan Li Lingxiao Ouyang Akihiko Chiba Department of Materials Processing Graduate School of EngineeringTohoku University6-6-11 AobaAramakiAoba-kuSendai980-8579Japan Institute for Materials Research Tohoku University2-1-1 KatahiraAoba-kuSendai980-8577Japan School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471023China Collaborative Innovation Center of Nonferrous Metals Henan ProvinceLuoyang471023China

The deformation mechanism of slips and twins has a considerable influence on the plasticity of magnesium alloys. However, the roles of slips and twins in the room-temperature deformation of Mg-rare earth(Mg-RE) alloys with high contents of rare earth elements is rarely investigated. Here, the microstructural evolution and deformation mechanism of an aged Mg-5 Y-2 Nd-3 Sm-0.5 Zr alloy during uniaxial compression at room temperature were systematically investigated using in-situ electron-backscattered diffraction and transmission electron microscopy. The results indicated that in the early stage of deformation, the Mg-RE alloy was mainly controlled by the slip of dislocations in the basal plane and the coordinated c-axis strain of the {10-12} twin. With an increase in the strain, the grain orientation became more suitable for the initiation of pyramidal Ⅱ dislocations in the later stage of deformation;these dominated the deformation mechanism. In the twin evolution of the Mg-RE alloy, there were three types of twin-twin interaction behaviors:(i) single twin variant 'parallel' structure,(ii) single twin variant 'cross' structure, and(iii) multi twin variant 'cross' structure. In addition, three types of twin-grain boundary interaction behaviors were summarized:(i) twin 'refracting through' grain boundary,(ii) twin'parallel through' grain boundary, and(iii) twin 'fusing through' grain boundary, which are expected to act as new means and solutions for the twin strengthening of magnesium alloys.

关键词： Mg-RE alloy Crystal plasticity In-situ EBSD Dislocation Twinning

Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy

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Journal of Magnesium and Alloys 2021年第2期9卷 456-466页

作者： Yunwei Gui Lingxiao Ouyang yujie cui Huakang Bian Quanan Li Akihiko Chiba Department of Materials Processing Graduate School of EngineeringTohoku University6-6-11 AobaAramakiAoba-kuSendai 980-8579Japan Institute for Materials Research Tohoku University2-1-1 KatahiraAoba-kuSendai 980-8577Japan School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Collaborative Innovation Center of Nonferrous Metals Henan ProvinceLuoyang 471023China

We utilized electron backscatter diffraction to investigate the microstructure evolutions of a newly developed magnesium-rare earth alloy(Mg–9.80 Gd–3.78 Y–1.12 Sm–0.48 Zr)during instantaneous hot indirect *** equiaxed fine-grained(average grain size of 3.4±0.2μm)microstructure with a weak texture was *** grain refinement was mainly attributed to the discontinuous dynamic recrystallization(DDRX)and continuous DRX(CDRX)processes during the hot indirect extrusion *** twin boundaries formed during the initial deformation stage effectively increased the number of high angle grain boundaries(HAGBs),which provided sites for new grain nuclei,and hence,resulted in an improved DDRX *** with DDRX,CDRX processes characterized by low angle grain boundary(LAGB)networks were also observed in the grain interior due to effective dynamic recovery(DRV)at a relatively high temperature of 773 K and high strain ***,LAGB networks were transformed into HAGB networks by the progressive rotation of subgrains during the CDRX process.

关键词： Magnesium-rare earth(Mg-Re)alloy Grain refinement Discontinuous dynamic recrystallization(DDRX) Continuous dynamic recrystallization(CDRX) Hot indirect extrusion

Underlying slip/twinning activities of Mg-xGd alloys investigated by modified lattice rotation analysis

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Journal of Magnesium and Alloys 2023年第3期11卷 998-1015页

作者： Biaobiao Yang Chenying Shi Xianjue Ye Jianwei Teng Ruilin Lai yujie cui Dikai Guan Hongwei cui Yunping Li Akihiko Chiba State Key Lab for Powder Metallurgy Central South UniversityChangsha 410083China Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Department of Materials Science and Engineering University of SheffieldMappin StreetSheffield S13JDUnited Kingdom School of Materials Science and Engineering Shandong University of TechnologyZibo 255000China

The inconsistencies regarding the fundamental correlation between Gd content and slip(twinning)activities of Mg alloys appeal further ***,the traditional slip dislocations analysis by TEM is time-consuming,and that by SEM/EBSD cannot recognize the partial slip *** urge a more efficient and comprehensive approach to easily distinguish all potential slip modes occurred concurrently in alloy *** we report a modified lattice rotation analysis that can distinguish all slip systems and provide statistical results for slip activities in Mg alloy *** this method,the high ductility of Mg-Gd alloy ascribed to the enhanced non-basal slips,cross-slip,and postponed twinning activities by Gd addition is quantitatively clarified.

关键词： Mg-Gd alloy Non-basal slips Postponed twinning Grain boundary segregation Modified lattice rotation analysis

High-temperature ultra-strength of dual-phase Re_(0.5)MoNbW(TaC)_(0.5) high-entropy alloy matrix composite

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Journal of Materials Science & Technology 2021年第25期84卷 1-9页

作者： Qinqin Wei Guoqiang Luo RongTu Jian Zhang Qiang Shen yujie cui Yunwei Gui Akihiko Chiba State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Institute for Materials Research Tohoku UniversitySendai980-8577Japan

The dual-phase Re_(0.5)MoNbW(TaC)_(0.5) composite,consisting of refractory body-centered cubic(BCC)highentropy alloy and carbide with many fine eutectic structures,was successfully synthesized by arc *** phase stability,high-temperature mechanical properties and strengthening mechanism of the ascast composite were *** microstructure of the composite remained stable after annealing at 1300℃for 168 *** exhibited remarkably high-temperature strength,yield strength~901 MPa,and true ultimate compressive strength~1186 MPa at 1200℃.The BCC phase and carbide exhibited a semi-coherent interface with good bonding after severe deformation at 1200℃.The dipolar dislocation walls in BCC phase,restricted dynamic interaction between defects in carbide,and the pinning effect of semi-coherent interface offered effective strengthening effects.

关键词： High-entropy alloy Composite Eutectic structure Strength Strengthening mechanism

Quasi-in-situ study on{10-12}twinning-detwinning behavior of rolled Mg-Li alloy in two-step compression(RD)-compression(ND)process

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Journal of Magnesium and Alloys 2022年第10期10卷 2775-2787页

作者： Biaobiao Yang Chenying Shi Siyu Zhang Jingjing Hu Jianwei Teng yujie cui Yunping Li Akihiko Chiba State Key Lab for Powder Metallurgy Central South UniversityChangsha 410083China Institute for Materials Research Tohoku UniversitySendai 980-8577Japan

Twinning-detwinning(TDT)behavior in a strongly basal-textured Mg-Li alloy during two-step compression(RD)-compression(ND)process was investigated using quasi-in-situ *** behavior and TDT variants selection were statistically discussed with the loading path for the first ***-Schmid twinning behavior was observed in the first step compression,owing to the local stress fluctuations by neighboring twins;in contrast,Schmid’s law well predicted the detwinning variants *** asymmetrical TDT behavior was first investigated to date related with the strong basal texture and loading ***,with the progress of compression,Schmid factors for twinning demonstrated a decreasing tendency;however,those for detwinning during the second step displayed an abnormally increasing trend,fundamentally stemming from prior twinning behavior.

关键词： Twinning-detwinning Mg-Li alloy Quasi-in-situ Biaxial loading

Development of Surface Plasmon Resonance-Based Biosensor Immunoassay for Sulfamethoxazole

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稀有金属材料与工程 2006年第A03期35卷 91-94页

作者： Hui Li Dafu cui yujie Wang Hao-yuan Cai Junbo Wang Zipan Zheng State Key Lab. of Transducer Tech. Inst. of Electronics Chinese Academy of Sciences Beijing 100080 China

The illegal use of veterinary drugs has led to the occurrence of residues in food of animal *** is a hazard to people's *** this paper,a sensitive and fast assay was developed to determine sulfamethoxazole (SMOZ) in PBS with a homemade surface plasmon resonance (SPR)-based biosensor which had a single flow channel and two *** derivative of SMOZ was covalently immobilized to a carboxymethyldextran modified gold film.A recently developed monoclonal antibody against sulfamethoxazole was used to develop an inhibitive immunobiosensor assay in which the antibody was mixed with SMOZ of different concentrations prepared with PBS to construct a standard curve with a low limit of detection(LOD).The effect of matrix in milk was also *** of the apparent concentration showed the cross-reactivity with other sulfonamides.

关键词： SPR immunobiosensor sulfamethoxazole

Influence of asymmetric tidal mixing on sediment dynamics in a partially mixed estuary

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Acta Oceanologica Sinica 2023年第9期42卷 1-15页

作者： Zhongyong Yang Zhiming Liang Yufeng Ren Daobin Ji Hualong Luan Changwen Li yujie cui Andreas Lorke College of Hydraulic and Environmental Engineering China Three Gorges UniversityYichang 443002China Hubei Field Observation and Scientific Research Stations for Water Ecosystem in Three Gorges Reservoir China Three Gorges UniversityYichang 443002China Hubei Key Laboratory of Intelligent Yangtze and Hydroelectric Science China Yangtze Power Co.Ltd.Yichang 443000China River Research Department Changjiang River Scientific Research InstituteWuhan 430010China Institute for Environmental Sciences University of Koblenz-LandauLandau 76829Germany

To investigate the influence of asymmetric tidal mixing(ATM) on sediment dynamics in tidal estuaries, we developed a vertically one-dimensional idealized analytical model, in which the M_2 tidal flow, residual flow and suspended sediment concentration(SSC) are described. Model solutions are obtained in terms of tidallyaveraged, and tidally-varying components(M_2 and M_4) of both hydrodynamics and sediment dynamics. The effect of ATM was considered with a time-varying eddy viscosity and time-varying eddy diffusivity of SSC. For the first time, an analytical solution for SSC variation driven by varying diffusivity could be derived. The model was applied to York River Estuary, where higher(or lower) eddy diffusivity was observed during flood(or ebb) in a previous study. The model results agreed well with the observation in both hydrodynamics and sediment dynamics. The vertical sediment distribution under the influence of ATM was analyzed in terms of the phase lag of the M_2 component of SSC relative to tidal flow. The phase lag increases significantly in estuaries with typical ATM(higher diffusivity during flood and lower diffusivity during ebb) for the case of seaward-directed net bottom shear stress(e.g., strong river discharge). In contrary, the phase lag is reduced by ATM, if the tidally-averaged bottom shear stress is landward(e.g., strong horizontal density gradient). The dynamics of sediment transport was analyzed as a function of ATM phase lag to identify the time of highest sediment diffusivity, as well as a function of the residual flow, to evaluate the relative importance of seaward and landward residual flows. In estuaries with relative strong fresh water discharge or weak tidal forcing(in case of flood season or neap tide), the near bottom SSC could be higher during ebb than during flood, since the bottom shear stress is higher during ebb due to seaward residual flow. However, landward net sediment transport can be expected in these estuaries in case of a

关键词： idealized model asymmetric sediment diffusivity vertical sediment phase lag sediment transport

Modified Z-Plasty for Reconstruction of Webbed Scar Contractures

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International Journal of Clinical Medicine 2023年第4期14卷 233-238页

作者： Xinfeng Huang Jiaqi Xu yujie cui Guangjin Su Feifei Chen Department of Burn and Plastic Surgery The Fifth Affiliated Hospital Sun Yat-sen University Zhuhai China Department of Rheumatology The Fifth Affiliated Hospital Sun Yat-sen University Zhuhai China

Rationale: Webbed scar contractures deformity caused by burns and other factors will lead to joint disorders and affect the mental health of patients, resulting in a severe decline in quality of life. Rapid, effective and less complicated surgical methods can help patients with post-burn rehabilitation. Objective: This article argues that a modified Z-plasty can quickly improve the range of motion caused by webbed scar contractures in joint areas, including surgical methods, postoperative care and prognosis. Methods and Results: The study took place from 2018 to 2022. Thirty-two patients with joint scar contracture deformity, with a mean age of 32.5 years, were included in the study. All patients underwent contracture scar revision and modified Z-plasty repair under anesthesia. All the flaps survived and the joint function was improved. Compared with the traditional Z-plasty, the duration of the operative procedure of the modified Z-plasty was significantly shorter, more surrounding scar tissue was mobilized, and the effectiveness of postoperative scar contracture release was better. Discussions: The modified Z-plasty for scar contracture deformity in joint area is simple, rapid, effective and easy to manage.

关键词： Modified Z-Plasty Surgical Flaps Contracture Plastic Surgery Procedures

Prevalence and factors associated with pentavalent vaccination:a cross-sectional study in Southern China

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Infectious Diseases of Poverty 2023年第5期12卷 32-44页

作者： Jianing Xu yujie cui Chuican Huang Yuanyuan Dong Yunting Zhang Lichun Fan Guohong Li Fan Jiang School of Public Health Shanghai Jiao Tong University School of Medicine227 South Chong Qing RoadShanghai 200025China China Hospital Development Institute Shanghai Jiao Tong UniversityShanghaiChina Department of Child Health Care Hainan Women and Children’s Medical CenterHaikouChina Child Health Advocacy Institute National Children’s Medical CenterShanghai Children’s Medical CenterSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Department of Developmental and Behavioral Pediatrics National Children’s Medical CenterShanghai Children’s Medical CenterSchool of MedicineShanghai Jiao Tong University227 South Chong Qing RoadShanghai 200025China Pediatric Translational Medicine Institute National Children’s Medical CenterShanghai Children’s Medical CenterSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Shanghai Center for Brain Science and Brain-Inspired Technology ShanghaiChina

Background Immunization is one of the most far-reaching and cost-effective strategies for promoting good health and saving lives.A complex immunization schedule,however,may be burdensome to parents and lead to reduced vaccine compliance and ***,it is critical to develop combination vaccines to reduce the number of injections and simplify the immunization *** study aimed to investigate the current status of the pentavalent diphtheria-tetanus-acellular pertussis inactivated poliomyelitis andHaemophilus influenzae type B conjugate(DTaP-IPV/Hib)vaccination in Southern China as well as explore the factors in the general population associated with uptake and the differences between urban and rural *** A cross-sectional study was conducted with recently enrolled kindergarten students in Hainan Province between December 2022 and January *** study employed a stratified multistage cluster random sampling *** regarding the demographic characteristics and factors that influence decisions were collected from the caregivers of children via an online *** logistic regression was used to determine the factors associated with the status of DTap-IPV/Hib *** Of the 4818 valid responses,95.3%of children were aged 3-4 years,and 2856(59.3%)held *** rates of the DTaP-IPV/Hib vaccine,from 1 to 4 doses,were 24.4%,20.7%,18.5%,and 16.0%,*** who are concerned about vaccine efficacy[adjusted odds ratio(aOR)=1.53,95%confidence interval(CI):1.30-1.79],the manufacturer(aOR=2.05,95%CI:1.69-2.49),and a simple immunization schedule(aOR=1.26,95%CI:1.04-1.54)are factors associated with a higher likelihood of vaccinating children against DTaP-IPV/*** addition,caregivers in urban areas showed more concern about the vaccine price(P=0.010)and immunization schedule(P=0.022)in regard to vaccinating *** The DTaP-IPV/Hib vaccine coverage rate in Hainan Provinc

关键词： Early child development Pentavalent Diphtheria-tetanus-acellular pertussis inactivated poliomyelitis and Haemophilus influenzae type B vaccine Vaccination coverage Influencing factor China