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Tailoring the Texture and Mechanical Anisotropy of Multi-cross Rolled Mg-Zn-Gd Alloy by Annealing

Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 251-265页

作者： Xihai Li Hong YAN Rongshi Chen School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao266590China

The unidirectional rolled Mg-Zn-Gd sheet usually exhibited non-basal texture with two peaks whose tilting angle were about 42°from normal direction to transverse direction(TD),which would cause the mechanical anisotropy.In this study,multi-cross rolling followed by annealing was used to tailor the texture and mechanical anisotropy for Mg-Zn-Gd alloy.With increasing annealing temperature,the rolled basal texture with two peaks gradually transformed into the circle texture with multi-peaks.In order to figure out different texture components evolution during annealing,the basal texture,R-texture and T-texture component were defined and studied.The results showed that the change of R-texture and T-texture component was asynchronous with increasing annealing temperature from 250 to 400℃.The tilting angle of R-texture component increased slightly,while the tilting angle of T-texture component increased obviously,and this phenomenon was attributed to the preferential nucleation at grain nucleation stage rather than preferential grain growth.The yield strength along TD was more sensitive to annealing temperature compared with that along rolling direction(RD),resulting in different descending slopes and yield strength anisotropy with increasing annealing temperature.Annealing at 300℃was the best annealing temperature due to low yield strength anisotropy,moderate strength and good elongation among these annealing temperatures.The Schmid factor for basal slip indicated that the activity of basal slip along RD increased slightly,while that along TD increased obviously with increasing annealing temperature from 250 to 400℃,which should be caused by the asynchronous change of R-texture component and T-texture component,consequently resulting in the transformation from isotropic yield strength to anisotropic yield strength.

关键词： Mg-Zn-Gd alloy Annealing Texture Yield strength Electron back-scattering diffraction(EBSD)

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Microstructure and Texture Evolution of Mg‑14Gd‑0.5Zr Alloy during Rolling and Annealing under Diferent Temperatures

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 61-76页

作者： Chunxiao Li Hong YAN Rongshi Chen Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Mg alloys containing high rare earth(RE)elements are hard to be rolled due to their low ductility and high strength at low temperatures.Therefore,rolling at high temperatures is necessary for these alloys.In this work,a Mg-14Gd-0.5Zr(wt%)alloy was rolled one pass with 40%reduction at high temperatures over 450°C.The efects of rolling temperature on the microstructure and dynamic recrystallization behavior were analyzed in detail by the electron backscattered difraction(EBSD)method.The results revealed that the alloy shows good rollability at high temperature due to the activity of nonbasal dislocations and twins.However,dynamic recrystallization is difcult to take place because of the easy activation of multi-slip system and thus more accumulated strain energy.However,Gd segregation was observed at the grain boundary and it is inferred that the segregation can partially enhance the dynamic recrystallization ratio.Statically recrystallized grains with large size took place after short-term inter-pass annealing treatment ranging from 450℃to 500°C,and formed basal texture.The result suggests that the formation of basal texture during short-term annealing treatment was attributed to the growth of dynamic recrystallized grains caused by weakened Gd segregation.

关键词： Magnesium alloys Hot rolling Annealing Recrystallization Mg-Gd-Zr

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Dual Quaternions and Dual Quaternion Vectors

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Communications on Applied Mathematics and Computation 2022年第4期4卷 1494-1508页

作者： Liqun Qi Chen Ling Hong YAN Department of Mathematics School of ScienceHangzhou Dianzi UniversityHangzhou 310018ZhejiangChina Department of Applied Mathematics The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Electrical Engineering and Centre for Intelligent Multidimensional Data Analysis City University of Hong KongKowloonHong KongChina

We introduce a total order and an absolute value function for dual numbers.The absolute value function of dual numbers takes dual number values,and has properties similar to those of the absolute value function of real numbers.We define the magnitude of a dual quaternion,as a dual number.Based upon these,we extend 1-norm,co-norm,and 2-norm to dual quaternion vectors.

关键词： Dual number Absolute value function Dual quaternion Magnitude Norm

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Unified gas-kinetic particle method for dilute granular flow and its application in a solid jet

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Acta Mechanica Sinica 2020年第1期36卷 22-34页

作者： Zhao Wang Hong YAN yangtze River Delta Research Institute of NPU Northwestern Polytechnical UniversityTaicang215400JiangsuChina Shaanxi Key Laboratory of Internal Aerodynamics in Aero-Engine Xi’an710072China

Because of its complexity,the problem of multiscale structure in granular flow has been receiving increasing attention.In this work,in order to conduct an in-depth exploration of the multiscale structure,a unified gas-kinetic particle(UGKP)method suitable for granular flow is constructed,in which the collision damping term and return-to-isotropy term are added to characterize the collision between particles.For the above two collision terms,the former characterizes the inelastic collision of particles,while the latter emphasizes the importance of the isotropic distribution of particles,which makes the results more reliable and reasonable.The construction of unified gas-kinetic schemes(UGKS)for granular flow has been reported in previous research.However,because of the need for discrete velocity space,the calculation size is quite large,making it impossible to use UGKS directly to investigate the multiscale problem.However,for UGKP,the flux contributed by particle free transport is calculated by free-streaming particles instead of discrete velocity space so that the corresponding calculation is much smaller than UGKS.The validity of the method is verified by numerical simulation of the solid jet compared with the particle-in-cell(PIC)method.In addition,since the sampled particles are used to obtain the flux contributed by the free transport,UGKP is more efficient than UGKS for solving multiscale problems.

关键词： Granular flow UGKP Multiscale Return-to-isotropy

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Enhanced corrosion resistance of epoxy resin coating via addition of CeO_(2) and benzotriazole

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Chinese Journal of Chemical Engineering 2024年第3期67卷 89-96页

作者： Xu Han Ruijie Guo Baolong Niu Hong YAN College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China

The use of fillers to enhance the corrosion protection of epoxy resins has been widely applied.In this work,cerium dioxide(CeO_(2))and benzotriazole(BTA)were introduced into an epoxy resin to enhance the corrosion resistance of Q235 carbon steel.Scanning electron microscopy results indicated that the CeO_(2) grains were rod-like and ellipsoidal in shape,and the distribution pattern of BTA was analyzed by energy dispersive spectroscope.The dynamic potential polarization curve proved the excellent corrosion resistance of the composite epoxy resin with CeO_(2) and BTA co-addition,and electrochemical impedance spectroscopy test analysis indicated the significantly enhanced long-term corrosion protection performance of the composite coating.And the optimal protective performance was provided by the coating containing 0.3%(mass)CeO_(2) and 20%(mass)BTA,which was attributed to the barrier performance of CeO_(2) particles and the chemical barrier effect of BTA.The formation of corrosion products was analyzed using X-ray diffraction.In addition,the corrosion resistance mechanism of the coating was also discussed in detail.

关键词： Benzotriazole Cerium dioxide Corrosion resistance Carbon steel Epoxy resin coating Preparation

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The Multiple Roles of Autophagy in Neural Function and Diseases

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Neuroscience Bulletin 2024年第3期40卷 363-382页

作者： yan-yan Li Zheng-hong Qin Rui Sheng Department of Pharmacology and Laboratory of Aging and Nervous Diseases Jiangsu Key laboratory of Neuropsychiatric DiseasesCollege of Pharmaceutical Sciences of Soochow UniversitySuzhou 215123China

Autophagy involves the sequestration and delivery of cytoplasmic materials to lysosomes,where proteins,lipids,and organelles are degraded and recycled.According to the way the cytoplasmic components are engulfed,autophagy can be divided into macroautophagy,microautophagy,and chaperone-mediated autophagy.Recently,many studies have found that autophagy plays an important role in neurological diseases,including Alzheimer's disease,Parkinson's disease,Huntington's disease,neuronal excitotoxicity,and cerebral ischemia.Autophagy maintains cell homeostasis in the nervous system via degradation of misfolded proteins,elimination of damaged organelles,and regulation of apoptosis and inflammation.AMPK-mTOR,Beclin 1,TP53,endoplasmic reticulum stress,and other signal pathways are involved in the regulation of autophagy and can be used as potential therapeutic targets for neurological diseases.Here,we discuss the role,functions,and signal pathways of autophagy in neurological diseases,which will shed light on the pathogenic mechanisms of neurological diseases and suggest novel targets for therapies.

关键词： Autophagy Neurodegenerative diseases Cerebral ischemia AMPK mTOR Beclin 1 TP53 Endoplasmic reticulum stress

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Tailoring the texture and mechanical properties of 3%Y_(2)O_(3)p/ZGK200 composites fabricated by unidirectional and cross rolling followed by annealing

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Journal of Magnesium and Alloys 2024年第4期12卷 1479-1495页

作者： Xihai Li Hong YAN Zhiwei Shan Rongshi Chen Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano)and Hysitron Applied Research Center in China(HARCC) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China

3%Y_(2)O_(3)p/ZGK200 composites were subjected to unidirectional rolling(UR)and cross rolling(CR)at 400℃and 350℃followed by annealing at 300℃for 1 h.The microstructure,texture and mechanical properties of rolled and annealed composites were systematically studied.The rolled composites exhibited a heterogeneous microstructure,consisting of deformed grains elongated along rolling direction(RD)and Y_(2)O_(3)particles bands distributed along RD.After annealing,static recrystallization(SRX)occurred and most deformed grains transformed into equiaxed grains.A non-basal texture with two strong T-texture components was obtained after UR while a non-basal elliptical/circle texture with circle multi-peaks was obtained after CR,indicating that rolling path had great influences on texture of the composites.After annealing process,R-texture component disappeared or weakened,as results,a non-basal texture with double peaks tilting from normal direction(ND)to transverse direction(TD)and a more random non-basal texture with circle multi-peaks were obtained for UR and CR composites,respectively.The yield strength of rolled composites after UR showed obvious anisotropy along RD and TD while a low anisotropic yield strength was obtained after CR.Some Y_(2)O_(3)particles broke during rolling.The fracture of the composites was attributed to the existence of Y_(2)O_(3)clusters and interfacial debonding between particles and matrix during tension,as a result,the ductility was not as superior as matrix alloy.

关键词： Magnesium matrix composites Unidirectional rolling Cross rolling Texture Mechanical properties

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Functions of SURF4 gene in vivo

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Chinese Medical Journal 2023年第2期136卷 248-250页

作者： yan Zhao hong Yu Department of Pathology and Pathophysiology Medical College of Nantong UniversityNantongJiangsu 226007China Department of Pathology The Affiliated Taizhou People’s Hospital of Nanjing Medical UniversityTaizhouJiangsu 225300China

To the Editor:Recently,we reviewed almost all the articles reporting surfeit locus containing the six sequenceunrelated housekeeping genes Surfeit 1 to Surfeit 6 since 1988 and one of the family members,surfeit 4(SURF 4)gene interested us.In this article,we will summarize the characteristics and protein localization of SURF4 gene,as well as its possible physiological functions and pathogenesis in various diseases and cancers,expecting to explore its clinical application values.

关键词： diseases pathogenesis clinical

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Global pattern and determinants of coronavirus disease 2019(COVID-19)vaccine coverage and progression:a global ecological study

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Global Health Journal 2023年第1期7卷 18-23页

作者： Huihao Wang Bin Yu Xinguang Chen Hong YAN Department of Epidemiology and Health Statistics School of Public HealthWuhan UniversityWuhanHubei 430000China Population and Health Research Center Wuhan UniversityWuhanHubei 430000China Global Health Institute Wuhan UniversityWuhanHubei 430000China

Background:Understanding and minimizing existing global coronavirus disease 2019(COVID-19)vaccination disparities is critical to global population health and eliminating health inequities.The study aims to investigate the disparities of vaccination coverage and progression and the associated economic and educational determinants to inform global COVID-19 vaccination strategies.Methods:COVID-19 vaccination coverage data from 206 countries used in the study were derived from“Our World in Data”website.After obtaining the vaccination coverage indicators,we fitted the progression indicators for vaccination.Correlation and multiple linear regression analysis were used to examine the effects of gross domestic product(GDP)per capita,Gini index,education,and their interactions on the coverage and progression of the COVID-19 vaccination.Results:The coverage of COVID-19 vaccination ranged from less than 30 doses to more than 150 doses per hundred people,from less than 15%to more than 75%for proportion of people vaccinated,from less than 15%to more than 60%for proportion of people fully vaccinated.Similarly,the progression of vaccination ranged from less than 0.1 to more than 0.6 for progression of total number of doses,from less than 0.1 to more than 0.3 for progression of proportion of people vaccinated,and from less than 0.1 to more than 0.4 for progression of proportion of people fully vaccinated.GDP per capita and education were positively associated with the coverage and progression,while Gini index was negatively associated with the coverage and progression.Negative interaction between GDP per capita and education was also observed for coverage(0=-0.012 to-0.011,P<0.05)and progression(0=-0.012 to-0.011,P<0.05).Conclusions:Substantial geographic disparities existed for the coverage and progression of COVID-19 vaccination.

关键词： Coronavirus disease 2019(COVID-19) Vaccination GDP per capita Gini index Education

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A novel high-efficient P/N/Si-containing APP-based flame retardant with a silane coupling agent in its molecular structure for epoxy resin

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Chinese Journal of Chemical Engineering 2023年第3期55卷 137-147页

作者： Qiang Sun Jinlei Wang Xue Meng Jie Zhang Hong YAN College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Key Laboratory of Interface Science and Engineering in Advanced Materials(Taiyuan University of Technology) Ministry of EducationTaiyuan 030024China

A flame retardant containing multiple antiflaming elements usually exhibits high-efficient flame retardancy. Here, a novel P/N/Si-containing ammonium polyphosphate derivative(APTES-APP) is synthesized from ammonium polyphosphate(APP) and silane coupling agent(3-aminopropyl)triethoxysilane(APTES)via cation exchange, which is quite different in the chemical structure from APTES-modified APP for retaining silicon hydroxyls. APTES-APP is highly efficient for the epoxy resin. 8%(mass) APTES-APP imparts excellent flame retardancy to the epoxy resin, with a V-0 rating at the UL-94 test(1.6 mm)and an LOI value of 26%(vol). The peak heat release rate and total smoke production of the flameretardant epoxy resin are decreased by 68.1% and 31.3%, respectively. The synergy of P/N/Si contributes to the well-expanded char residue with a strong and dense surface layer, which is a very good barrier against heat and mass transfer. Besides, there is no significant deterioration in the mechanical properties of flame-retardant epoxy resin thanks to silicon hydroxyls forming hydrogen bonds with epoxy molecules. Meanwhile, other molecules can be grafted onto APTES-APP via these silicon hydroxyls, if needed.Briefly, this work has developed a new strategy for amino silane as flame retardants. In conjunction with a low-cost and simple preparation method, APTES-APP has a promising prospect in the high-performance flame-retardant epoxy.

关键词： Ammonium polyphosphate Silane coupling agent All-in-one system Flame retardancy Epoxy resin

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