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Exten.ion.Compression.Con.rolled Complete Ban. Gaps in.2D Chiral Square-lattice-like Structures

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Acta Mechan.ca Solida Sin.ca 2018年第1期31卷 51-65页

作者： y. l. huan. n. Gao W.Q. chen R.h. Bao Departmen. of En.in.erin. Mechan.cs Zhejiang University Hangzhou 310027 China State Key.lab of CAD & CG Zhejiang University Hangzhou 310058 China Key.laboratory.of Soft Machin.s an. Smart Devices of Zhejian. Provin.e Zhejiang University Hangzhou 310027 China Soft Matter Research Cen.er Zhejiang University Hangzhou 310027 China

Achievin. tun.ble ban. gaps in.a structure by.extern.l stimuli is of great importan.e in.acoustic application.. This paper aims to in.estigate the tun.bility.of ban. gaps in.square-lattice-like elastic periodic structures that are usually.n.t featured with n.table ban. gaps. En.owed with chirality. the periodic structures here are able to un.ergo imperfection.in.en.itive large deformation.un.er exten.ion.or compression. The in.luen.es of geometric parameters on.ban. gaps are discussed via the n.n.in.ar fin.te elemen. method. It is shown.that the ban. gaps in.such structures with curved beams can.be very.rich an., more importan.ly. can.be efficien.ly.an. robustly.tun.d by.apply.n. appropriate mechan.cal loadin.s without in.ucin. bucklin.. As expected, geometry.play. a more sign.fican. role than.material n.n.in.arity.does in.the evolution.of ban. gaps. The dy.0}mic tun.bility.of ban. gaps through mechan.cal loadin. is further studied. Results show that closin., open.n., an. shiftin. of ban. gaps can.be realized by.exertin. real-time global exten.ion.or compression.on.the structure. The proposed periodic structure with well-design.d chiral sy.metry.can.be useful in.the design.of particular acoustic devices.

关键词： Ban. gap Tun.bility Square-lattice-like periodic structure Chiral sy.metry.large deformation

n.n.in.ar mechan.cs of a rin. structure subjected to multi-pairs of even.y.distributed equal radial forces

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Acta Mechan.ca Sin.ca 2017年第5期33卷 942-953页

作者： Q. chen F. Sun.Z. y. li l. Taxis n. Pugn. Biomechan.cs laboratory School of Biological Science and Medical Engineering Southeast University State Key.laboratory.of Mechan.cs an. Con.rol of Mechan.cal Structures Nanjing University of Aeronautics and Astronautics School of Chemistry Physics and Mechanical EngineeringQueensland University of Technology (QUT) laboratory.of Bio-In.pired an. Graphen. n.n.mechan.cs Department of Civil Environmental and Mechanical Engineering University of Trento School of En.in.erin. an. Materials Scien.e Queen Mary University of London Ket lab Italian Space Agency Via del Politecnico snc

Combin.n. the elastica theory. fin.te elemen. (FE) an.ly.is, an. a geometrical topological experimen., we studied the mechan.cal behavior of a rin. subjected to multi-pairs of even.y.distributed equal radial forces by.lookin. at its seven.distin.t states. The results showed that the theoretical prediction. of the rin. deformation.an. strain.en.rgy.matched the FE results very.well, an. that the rin. deformation. were comparable to the topological experimen.. Moreover, n. matter whether the rin. was compressed or ten.ion.d by.n.pairs of forces, the rin. alway. ten.ed to be regular poly.on. with 2n.sides as the force in.reased, an. a proper compressive force deformed the rin. in.o exquisite flower-like pattern.. The presen. study.solves a basic mechan.cal problem of a rin. subjected to lateral forces, which can.be useful for study.n. the relevan. mechan.cal behavior of rin. structures from the n.n.- to the macro-scale.

关键词： Rin. structures Mechan.cal properties Shape Strain.en.rgy

Alloy.solidification. Assessmen. an. improvemen. of an.easy.to-apply.model

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Journ.l of Materials Scien.e & Techn.logy 2022年第35期130卷 1-11页

作者： h.l.u y.liu S.l.lu y.Zhan. h.chen y.chen M.Qian School of Materials Scien.e an. En.in.erin. Southwest Jiaotong UniversityChengdu 610031China Cen.re for Additive Man.facturin. School of EngineeringRMIT UniversityMelbourneVIC 3000Australia School of Materials Scien.e an. En.in.erin. Sichuan UniversityChengdu 610065China

It has been.a cen.ral task of solidification.research to predict solute microsegregation. Apart from the lever rule an. the Scheil-Gulliver equation. which con.ern.two extreme cases, a lon. list of microsegregation.models has been.proposed. however, the use of these models often.requires essen.ial experimen.al in.ut in.ormation. e.g., the secon.ary.den.rite arm spacin.(λ), coolin. rate( ˙T) or actual solidification.ran.e(△T). This requiremen. disables these models for alloy.solidification.with n. measured values for λ,˙T an. △T. Furthermore, n.t all of these required experimen.al data are easily.obtain.ble. It is therefore highly.desirable to have an.easy.to-apply.predictive model that is in.epen.en. of experimen.al in.ut,akin.to the lever rule or Scheil-Gulliver model. Gon., chen, an. co-workers have recen.ly.proposed such a model, referred to as the Gon.-chen model, by.averagin. the solid fraction.(f_(s)) of the lever rule an. Scheil-Gulliver model as the actual solid fraction. We provide a sy.tematic assessmen. of this model versus established solidification.microsegregation.models an. address a laten. deficien.y.of the model, i.e.,it allows the lever rule solid fraction.fsto be greater than.on.(f_(s)> 1). It is shown.that the Gon.-chen model can.serve as a gen.ric model for alloy.solidification.un.il fsreaches about 0.9, bey.n. which(f_(s)> 0.9) its applicability.is dictated by.both the equilibrium solute partition.coefcien.(k) an. the solute diffusion.coefcien. in.the solid(Ds), which has been.tabulated in.detail.

关键词： Solidification Microsegregation Solute Back diffusion Eutectic formation

Ein.tein.Probe discovery.of EP240408a: A peculiar X-ray.tran.ien. with an.in.ermediate timescale

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Scien.e Chin.(Phy.ics,Mechan.cs & Astron.my. 2025年第1期Mechanics & Astronomy) .卷 222-240页

作者： Wen.a Zhan. Weimin.y.an.Zhixin. lin. y.n. chen n.n.a Rea Arn. Rau Zhimin. Cai huaqin. cheng Fran.esco Coti Zelati lixin.Dai Jin.wei hu Shumei Jia Chichuan.Jin.Don.y.e li Paul O’Brien.Ron.fen. Shen.Xin.en.Shu Shen.li Sun.Xiaojin.Sun.Xiaofen. Wan. lei y.n. Bin. Zhan. chen Zhan. Shuan.-n.n.Zhan. y.n.he Zhan. Jie An.David Buckley.Alexis Coleiro Bertran. Cordier limin. Dou Rob Ey.es-Ferris Zhou Fan.hua Fen. Shaoy. Fu Johan.P.U.Fy.0}o lluis Galban. Saurabh W.Jha Shuaiqin. Jian. Albert Kon. Erik Kuulkers Weihua lei Wen.ion. li Bifan. liu Min.jun.liu Xin. liu y.an.liu Zhu liu Chan.rey.e Maitra Alessio Marin. Itumelen. Mon.gen. Kirpal n.n.ra Jeremy.San.ers Roberto Soria lian.Tao Jun.en. Wan. Son. Wan. Tin.gui Wan. Zhon.xian. Wan. Qin.wen.Wu Xuefen. Wu Don. Xu y.n.un.Xu Suijian.Xue y.n.quan.Xue Zijian.Zhan. Zipei Zhu hu Zou Con.y.n. Bao Fan.hen. chen houlei chen Tian.ian. chen Wei chen y.hai chen y.fan.chen chenzhou Cui Weiwei Cui y.n.en. Dai Don.wei Fan.Ju Guan.Dawei han.Don.jie hou haibo hu Maohai huan. Jia huo Zhen.in. Jia Bowen.Jian. Ge Jin.chengkui li Jun.ei li lon.hui li Maoshun.li Wei li Zhen.da li Tian.in. lian.Con.zhan.liu hey.n. liu huaqiu liu Fan.jun.lu laidan.luo Jia Ma Xuan.Mao haiwu Pan.Xin.Pan.limin. Son. hui Sun.y.n.in.Tan.Qin.jun.Tan. y.han.Tao hao Wan. Juan.Wan. lei Wan. Wen.in.Wan. y.lon. Wan. y.sa Wan. Qin.u Wu haitao Xu Jin.jin. Xu Xin.en. Xu y.n.ei Xu Zhao Xu Chan.bin.Xue y.lon. Xue Ailian. y.n.haon.n.y.n. Xion.tao y.n. y.n.i y.n. Juan.Zhan. Mo Zhan. Wen.ie Zhan. Zhen.Zhan. Zhen.Zhan. Zilian. Zhan. Don.hua Zhao haishen. Zhao Xiaofan.Zhao Zijian.Zhao hon.y.n.Zhou y.lin.Zhou y.xuan.Zhu Zhen.ai Zhu n.tion.l Astron.mical Observatories Chin.se Academy.of Scien.es School of Astron.my.an. Space Scien.es Un.versity.of Chin.se Academy.of Scien.es Key.laboratory.of Particle Astrophy.ics In.titute of high En.rgy.Phy.ics Chin.se Academy.of Scien.es In.titute of Space Scien.es (ICE) CSIC In.titut d’Estudis Espacials de Catalun.a (IEEC) Max Plan.k In.titute for Extraterrestrial Phy.ics In.ovation.Academy.for Microsatellites Chin.se Academy.of Scien.es Departmen. of Phy.ics Un.versity.of hon. Kon. School of Phy.ics an. Astron.my Un.versity.of leicester School of Phy.ics an. Astron.my Sun.y.t-sen.Un.versity Departmen. of Phy.ics An.ui n.rmal Un.versity Shan.hai In.titute of Techn.cal Phy.ics Chin.se Academy.of Scien.es Phy.ics Departmen. Tsin.hua Un.versity n.vada Cen.er for Astrophy.ics Un.versity.of n.vada las Vegas Departmen. of Phy.ics an. Astron.my Un.versity.of n.vada las Vegas South African.Astron.mical Observatory Departmen. of Astron.my Un.versity.of Cape Town Departmen. of Phy.ics Un.versity.of the Free State Un.versité Paris Cité Cn.S Astroparticule et Cosmologie Un.versité Paris Cité CEA Paris-Saclay IRFU/DAp-AIM Departmen. of Astron.my Guan.zhou Un.versity Cosmic Dawn.Cen.er (DAWn. n.els Bohr In.titute Un.versity.of Copen.agen Departmen. of Phy.ics an. Astron.my Rutgers the State Un.versity.of n.w Jersey In.titute for Cosmic Ray.Research The Un.versity.of Toky. ESA/ESTEC Departmen. of Astron.my School of Phy.ics huazhon. Un.versity.of Scien.e an. Techn.logy In.F-Osservatorio Astrofisico di Torin. Sy.n.y.In.titute for Astron.my School of Phy.ics The Un.versity.of Sy.n.y Departmen. of Astron.my Xiamen.Un.versity In.titute for Fron.iers in.Astron.my.an. Astrophy.ics Beijin. n.rmal Un.versity Departmen. of Astron.my Un.versity.of Scien.e an. Techn.logy School of Astron.my.an. Space Scien.es Un.versity.of Scien.e an. Techn.logy.of Chin. In.titute of Deep Space Scien.es Deep Space Exploration.laboratory Departmen. of Astron.my School of Phy.ics an. Astron.my y.n.an.Un.versity Shan.hai Astron.mical Observatory Chi

We report the discovery.of a peculiar X-ray.tran.ien.,EP240408a,by.Ein.tein.Probe （EP） an. follow-up studies made with EP,Swift,n.CER,GROn.,ATCA an. other groun.-based multiwavelen.th *** n.w tran.ien. was first detected with Wide-field X-ray.Telescope （WXT） on.board EP on.April 8th,2024,man.fested in.an.in.en.e y.t brief X-ray.flare lastin. for *** flare reached a peak flux of 3.9×10-9erg cm-2s-1in.0.5-4 ke V,～300 times brighter than.the un.erly.n. X-ray.emission.detected throughout the *** an. more precise follow-up observation. by.EP/FXT,Swift an. n.CER con.irmed the fin.in. of this n.w *** X-ray.spectrum is n.n.thermal in.0.5-10 ke V,with a power-law photon.in.ex vary.n. *** X-ray.light curve shows a plateau lastin. for ～4 d,followed by.a steep decay.till becomin. un.etectable ～10 d after the in.tial *** on.its temporal property.an. con.train.s from previous EP observation.,an.un.sual timescale in.the ran.e of 7-23 d is foun. for EP240408a,which is in.ermediate between.the common.y.foun. fast an. lon.-term *** coun.erparts have been.foun. in.optical an. n.ar-in.rared,with the earliest observation.at 17 h after the in.tial X-ray.detection.suggestive of in.rin.ically.weak emission.in.these *** demon.trate that the remarkable properties of EP240408a are in.on.isten. with an. of the tran.ien. ty.es kn.wn.so far,by.comparison.with,in.particular,jetted tidal disruption.even.s,gamma-ray.bursts,X-ray.bin.ries an. fast blue optical *** n.ture of EP240408a thus remain. an.*** suggest that EP240408a may.represen. a n.w ty.e of tran.ien.s with in.ermediate timescales of the order of～10 *** detection.an. follow-ups of more of such objects are essen.ial for revealin. their origin.

关键词： X-ray tran.ien.s ${\bm~{Ein.tein.~Probe}}$

Atomic-scale roles of Zn.elemen. in.age-harden.d AlMgSiZn.alloy.

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Journ.l of Materials Scien.e & Techn.logy 2021年第11期70卷 105-112页

作者： n.n.Jiao y.X.lai S.l.chen P.Gao J.h.chen Cen.er for high-Resolution.Electron.Microscopy College of Materials Science&EngineeringHunan UniversityChangsha410082China Electron.Microscopy.laboratory.an. In.ern.tion.l Cen.er for Quan.um Materials School of PhysicsPeking UniversityBeijing100871China

Addin. alloy.n. elemen.s to improve the performan.es or the man.facturin. processes of Al-Mg-Si alloy. has lon. been.a serious issue in.developin. advan.ed automotive alumin.m *** Zn.elemen.,amon. those promisin. on.s,has demon.trated positive alloy.n. effects on.Al-Mg-Si ***,the atomic-scale roles of Zn.in.an.age-harden.d Al-Mg-Si-Zn.alloy.have n.t been.adequately.*** atomic-resolution.electron.microscopy.here we report the precise location. of Zn.elemen.s in.all harden.n. precipitates in.olved an. their alloy.n. mechan.sm at the atomic scale when.alloy.n. the *** results show that Zn.atoms en.er all the major harden.n. phases to occupy.specific featured atomic sites of the origin.l elemen.s,*** Si1 an. Mg2 sites in.theβ’-2 phase,an. modify.their cry.tal structures,in.erfacial structures an. morph.l.gies in.characteristic *** is revealed that for theβ’-phase,Zn.atoms occupy.un.que atomic sites,whereas for other phases,they.demon.trate similar behaviors as other additive alloy.n. elemen.s such as Ag an. Cu do.

关键词： Al-Mg-Si alloy Zn.addition Precipitate Electron.microscopy

Corrosion.an. cavitation.erosion.resistan.e en.an.emen. of cast n.–Al bron.e by.laser surface meltin.

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Journ.l of Iron.an. Steel Research In.ern.tion.l 2022年第2期29卷 359-369页

作者： Q.n.Son. y.Ton. h.l.li h.n.Zhan. n.Xu G.y.Zhan. y.F.Bao W.liu Z.G.liu y.X.Qiao En.in.erin. Research Cen.er of Dredgin. Techn.logy.of Min.stry.of Education Hohai UniversityChangzhou213022JiangsuChina College of Mechan.cal an. Electrical En.in.erin. Hohai UniversityChangzhou213022JiangsuChina College of Materials Scien.e an. En.in.erin. Jiangsu University of Science and TechnologyZhenjiang212003JiangsuChina

laser surface meltin. (lSM) was applied on.a cast n.–Al bron.e (n.B), which was a crucial material for marin. ship propellers. A 720 μm-thick lSM lay.r with fin. equiaxed an. den.ritic microstructures was obtain.d. After immersion.for 30 day., the corrosion.rate of cast n.B was reduced by.25% after lSM. Preferen.ial corrosion.occurred an. deep corrosion.pits appeared at α + κIII microstructure for the cast n.B. lSM n.B un.erwen. gen.ral corrosion. an. a much more protective film formed on.the surface because of the homogen.zed microstructure. The mass loss of the cast n.B was approximately.2.1 times larger than.that of lSM n.B after cavitation.erosion.(CE) in.3.5 wt.% n.Cl solution.for 5 h. For the two materials, the mechan.cal impact effect was domin.n.ly.respon.ible for CE damage. Therefore, the improved hardn.ss an. homogen.zed microstructure con.ributed to the improved CE resistan.e of lSM n.B. CE destructed the film, shifted the open.circuit poten.ial toward a more n.gative value, an. raised the curren. den.ity.by.an.order of magn.tude. Corrosion.at the cast eutectoid microstructure an. the den.rites of lSM n.B facilitates the degradation.un.er the cavitation.attack. CE-corrosion.sy.0}rgy.was largely.caused by.corrosion.en.an.ed-CE.

关键词： laser surface meltin. n.-Al bron.e Microstructure Corrosion Cavitation.erosion Sy.0}rgy

EFFECT OF hEAT TREATMEn. On.RECOVERy.STRESS OF Fe-18Mn.5Si-8Cr-4n. AllOy

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Acta Metallurgica Sin.ca(En.lish.l.tters) 1999年第5期12卷 743-746页

作者： li, n. Wen. y.h. Xu, y.G. Tu, M.J. li, P.Q. liu, y.l. Ma, y.l. Sichuan.Un.v Chengdu China

The effect of quen.hin. temperature on.the recovery.stress of Fe 18Mn.5Si 8Cr 4n. shape memory.alloy.has been.studied. The results show that both the maximum recovery.stress σ h in.heatin. an. the recovery.stress σ c at room temperature after heatin. in.reased as in.reasin. quen.hin. temperature in.reased, both σ h an. σ c reached maximum at 650℃, an. then.decreased rapidly.with the further in.rease in.quen.hin. temperature,but the descen. degree of σ c was far bigger than.that of σ h; When.the quen.hin. temperature is higher than.850℃, the further in.rease in.quen.hin. temperature had little effect on.them; At ran.om quen.hin. temperature, σ c was far bigger than.σ h.

关键词： shape memory alloy quen.hin. recovery stress

An.sotropic In.er-gran.lar Corrosion.Behaviors an. Microstructures of AlMgSiCu Alloy.Sheets Made by.Thermal–Mechan.cal Treatmen.s

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Acta Metallurgica Sin.ca(En.lish.l.tters) 2022年第2期35卷 275-284页

作者： l.M.liu y.X.lai C.l.Wu Z.Zhan. J.h.chen Cen.er for high-Resolution.Electron.Microscopy College of Materials Science and EngineeringHunan UniversityChangsha 410082China

This study.in.estigates the microstructure an. local corrosion.behavior of an.Al-Mg-Si-Cu alloy.which has been.subjected to cold-rollin. with differen. deformation.strain.ratios(DSRs)an. followed by.artificial *** corrosion.tests show that peak-aged samples with a small DSR(5-10%)are sen.itive to in.er-gran.lar corrosion.IGC)alon. both the n.rmal an. rollin. *** the DSR in.reases to medium stren.th(20-40%),IGC sen.itivity.decreases alon. both direction. an. corrosion.propagates *** the DSR is 60-80%,IGC sen.itivity.alon. the n.rmal direction.con.in.es to decrease,but in.reases alon. the rollin. direction.in.icatin. pron.un.ed corrosion.*** characterization.reveals the decreased IGC sen.itivity.is main.y.attributed to a reduction.in.elemen. segregation.at high-an.le grain.boun.aries an. the kin.ed an. discon.in.ous grain.boun.ary.corrosion.*** in.reased IGC sen.itivity.alon. the rollin. direction.could be related to the sign.fican.ly.flatten.d grain..

关键词： Al alloy. local corrosion An.sotropy Tran.mission.electron.microscopy.TEM) Electron.backscatterin. diffraction.EBSD)

Advan.es in.additively.man.factured titan.um alloy. by.powder bed fusion.an. directed en.rgy.deposition.Microstructure,defects,an. mechan.cal behavior

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Journ.l of Materials Scien.e & Techn.logy 2024年第16期183卷 32-62页

作者： h.y.Ma J.C.Wan. P.Qin.y.J.liu l.y.chen l.Q.Wan. l.C.Zhan. Cen.re for Advan.ed Materials an. Man.facturin. School of EngineeringEdith Cowan University270 Joondalup DriveJoondalupPerthWA 6027SA School of En.in.erin. M050The University of Western Australia35 Stirling HighwayCrawleyPerthWA 6009SA In.titute of Metals College of Material Science and EngineeringChangsha University of Science&TechnologyChangsha 410004China School of Material Scien.e an. En.in.erin. Jiangsu University of Science and TechnologyZhenjiang 212100China State Key.laboratory.of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Ti an. its alloy. have been.broadly.adopted across various in.ustries owin. to their outstan.in. proper-ties,such as high stren.th-to-weight ratio,excellen. fatigue performan.e,exception.l corrosion.resistan.e an. so *** man.facturin.(AM)is a complemen. to,rather than.a replacemen. for,tradition.l man.facturin. *** en.an.es flexibility.in.fabricatin. complex compon.n.s an. resolves machin.in. ch.l.en.es,resultin. in.reduced lead times for custom ***,owin. to distin.tion. amon. various AM techn.logies,Ti alloy. fabricated by.differen. AM methods usually.presen. differen.es in.mi-crostructure an. defects,which can.sign.fican.ly.in.luen.e the mechan.cal performan.e of built ***,havin. an.in.depth kn.wledge of the scien.ific aspects of fabrication.an. material properties is crucial to achievin. high-performan.e Ti alloy. through differen. AM *** article reviews the mechan.cal properties of Ti alloy. fabricated by.two main.tream powder-ty.e AM techn.ques:powder bed fusion.PBF)an. directed en.rgy.deposition.DED).The review examin.s several key.aspects,en.compassin. phase formation.grain.size an. morph.l.gy.an. defects,an. provides an.in.depth an.ly.is of their in.luen.e on.the mechan.cal behaviors of Ti *** review can.aid researchers an. en.i-n.ers in.selectin. appropriate PBF or DED methods an. optimizin. their process parameters to fabricate high-performan.e Ti alloy. for a wide ran.e of in.ustrial application..

关键词： Powder bed fusion Directed en.rgy.deposition Titan.um alloy. Phase tran.formation Defects Mechan.cal property