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Journal of Materials science & Technology 2019年第7期35卷 1315-1322页

作者： D.wang c.T.chi w.q.wang y.l.li M.s.wang x.g.chen z.h.chen x.p.cheng y.J.xie Institute of Applied physics Jiangxi Academy of SciencesNanchang 330029China Institute of Metal research Chinese Academy of SciencesShenyang 110016China school of Mechanical and Electrical Engineering Nanchang UniversityNanchang 330029China Jiangxi reman Additive Technology co. ltd Nanchang 330096China

The effects of atmosphere conditions on microstructural and mechanical properties of stainless steel 17-4ph components fabricated by laser direct manufacturing (lDM) were investigated through mea-surements on phase constitution, porosity, tensile strength, fracture morphology, hardness and evolution of substrate temperature. results showed that the samples produced in air atmosphere condition pos-sessed higher tensile strength and hardness for both as-deposited and heat-treated states than that in Ar chamber condition, due to dispersion strengthening effect of amorphous oxide particles and nitr.gen solution strengthening as a result of higher content of oxygen and nitr.gen. The temperature of substrate heat accumulation was higher in Ar chamber condition, leading to dramatically lower porosity and more reverse austenite, which also contributed to the lower strength and hardness.

关键词： Additive manufacturing laser direct manufacturing 17-4 ph stainless steel Fabrication atmosphere Mechanical properties

what is going on in magnesium alloys？

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Journal of Materials science & Technology 2018年第2期34卷 245-247页

作者： x.J. wang D.K. xu r.z. wu x.B. chen q.M. peng l. jin y.c. xin z.q. zhang y. liu x.h. chen g. chen K.K. Deng h.y. wang school of Materials science and Engineering Harbin Institute of Technology Harbin 150001 China Key laboratory of Nuclear Materials and safety Assessment Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Key laboratory of superlight Materials & surface Technology (Ministry of Education) Harbin Engineering University Harbin 150001 China school of Engineering RMIT University City Campus Carlton VIC 3053 Australia state Key laboratory of Metastable Materials science and Technology Yanshan University Qinhuangdao 066004 China National Engineering research center of light Alloy Net Forming Shanghai Jiao Tong University Shanghai 200240 China college of Materials science and Engineering Chongqing University Chongqing 400030 China Key lab of Electromagnetic processing of Materials Ministry of Education Northeastern UniversityShnenyang 110819China Key laboratory of lightweight and high strength structural Materials of Jiangxi province Nanchang University Nanchang 330031 China school of chemical Engineering and Technology Tianjin University Tianjin 300350 China shanxi Key laboratory of Advanced Magnesium-Based Materials Taiyuan University of Technology Taiyuan 030024 China Key laboratory of Automobile Materials of Ministry of Education & school of Materials science and Engineering Jilin University Changchun 130025 China

china has been developed into one of the most active r.gions in terms of both fundamental and applied research on magnesium （Mg） and its alloys in the world from a solid base laid by its prominent metallurgist and materials scientists over the past decades. Nowadays, a large number of young-generation researchers have been inspired by their predecessors and become the key participants in the fields of Mg alloys, which consequently led to the establishment of china youth scholar society for Magnesium Alloys research in 2015. since then, the first two china youth scholars symposiums on Mg Alloys research had been held at harbin （2015） and chongqing （2016） china, respectively. A number of crucial research inter- ests related to fundamental and applied Mg research were discussed at the conferences and summarized in this short perspective, aiming to boost far-reaching initiatives for development of new Mg-based materials to satisfy the requirements for a broad range of industrial employments. herein, four main aspects are included as follows： i） plastic deformation mechanism and strengthening strategy, ii） Design and development of new Mg-based materials, iii） Key service properties, and iv） New processing technologies.

关键词： Mg alloys plastic deformation strengthening Alloying design high performance corrosion Fatigue behavior creep processing technologies purification

Three principles for preparing Al wire with high strength and high electrical conductivity

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Journal of Materials science & Technology 2019年第5期35卷 742-751页

作者： J.p.hou r.li q.wang h.y.yu z.J.zhang q.y.chen h.Ma x.M.wu x.w.li z.F.zhang Materials Fatigue and Fracture Division Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China National quality supervision & Inspection center of Electrical Equipment safety performance Zhejiang Huadian Equipment Testing Institute Hangzhou 310015 China Electric power research Institute of liaoning Electric power co. Ltd. Liaoning Electric Power Co. Ltd. Shenyang 110006 China Department of Materials physics and chemistry School of Materials Science and Engineering Key Laboratory for Anisotropy and Texture of Materials Ministry of Education Northeastern University Shenyang 110819 China

The trade-off relation between the strength and the electrical conductivity has been a Iong-standing dilemma in metallic materials. In the study, three key principles, *** grains, sharp texture and nano-scale precipitates, were presented for preparing Al wire with high strength and high electrical conductivity based on the specially designed experiments for breaking the mutually exclusive relation between the strength and the electrical conductivity. The results show that the elongated grains could lead to a higher electrical conductivity in Al wire without sacrificing the strength;while, the sharp texture can efficiently strengthen the Al wire without influencing the electrical conductivity. Furthermore, nano-scale precipitates with proper size can simultaneously improve the strength and electrical conductivity of Al alloy wire. Under the guidance of the above three key principles, Al wires with high strength and high conductivity were prepared.

关键词： Al wire Texture precipitates strength Electrical conductivity

rational design of Aggas/zns/zns quantum dots with a near-unity photoluminescence quantum yield via double shelling scheme

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Journal of Materials science & Technology 2024年第2期169卷 235-242页

作者： h.x.lu h.liu z.z.Fu y.y.chen h.q.Dai z.hu w.l.zhang r.q.guo Institute for Electric light sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute of Future lighting Academy for Engineering and TechnologyFudan UniversityShanghai 200433China yiwu research Institute of Fudan university YiwuZhejiang 322000China zhongshan-Fudan Joint Innovation center Zhongshan 528437China

In this study,a two-step method was used to synthesize highly luminescent Aggas/zns/zns quantum dots(qDs).In the first step,an inner zns shell was formed via a one-pot method,which resulted in a smaller lattice mismatch between the Aggas core and the outer zns shell,thereby facilitating the formation of a thick outer *** the two-step shelling process,the synthesized Aggas/zns/zns qDs showed an excellent photoluminescence quantum yield(plqy)of 96.4%with a peak wavelength of 508 nm,repre-senting the highest plqy reported thus far for Aggas ***,the effect of halogen ions in zn precursors on the shelling process was *** was proposed that the capacity of halogen ions to coordinate with the qDs influenced the balance between zn cation diffusion and zns shelling ***,the zns shelling reaction was dominant when zncl_(2)was employed,while zn cation diffusion was the dominant process under the I^(−)-rich *** work provides insights into the interfacial restructuring during the zns shelling and offers a clear map for the tailored synthesis of core/shell qDs.

关键词： Aggas quantum dots photoluminescence core/shell Alloyed core/shell interface

Mapping sea level rise Behavior in an Estuarine Delta system：A case study along the shanghai coast

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Engineering 2018年第1期4卷 156-163页

作者： h.q. cheng J.y. chen z.J. chen r.l. ruan g.q. xu g. zeng J.r. zhu z.J. Dai x.y. chen s.h. gu x.l. zhang h.M. wang state Key laboratory of Estuarine and coastal research East China Normal University Shanghai 200062 China shanghai water planning Design and research Institute Shanghai 200232 China shanghai water Authority Shanghai 200050 China school of Urban and r.gional science East China Normal University Shanghai 200062 China school of Ecological and Environmental sciences East China Normal University Shanghai 200062 China shanghai hydrological station Shanghai 200232 China shanghai Municipal Bureau of Urban planning and land resources Shanghai 200003 China shanghai Institute of geological survey Shanghai 200072 China

sea level rise （slr） is a major projected threat of climate change that is expected to affect developing coastal cities located in estuarine delta r.gions, shanghai is one such city, being located in the yangtze river Delta （yrD）, It is difficult, however, for decision-makers to implement adaptation due to the uncer- tain causes, magnitudes, and timings of slr behaviors, This paper attempts to map the causes and mag- nitudes of slr behaviors on a decadal scale, we analyze the tidal level records from 11 tidal gauge stations and the corresponding bathymetry measurements around these stations since 1921, we identify three new slr behaviors along the shanghai coast due to anthropogenic geomorphologic changes （Agcs）, besides the well-known eustatic sea level rise （Eslr）, tectonic subsidence （Ts）, and urban land subsidence （Uls）, The first new behavior is r.gional sea level rise （rslr）, which occurs as a result of land reclamation and deep waterway r.gulation, The second is r.gional sea level fall （rslF）, which occurs because the channel bed is eroded due to sediment supply decline in the river catchment, The last slr behavior is local tidal datum rise （lTDr）. Thus, we project that the magnitude of slr for the shanghai coast ranges from 10 cm to 16 cm from 2011 to 2030, clarifying slr behaviors is important to aid local decision- makers in planning structural and non-structural measures to combat escalating flood damage costs in an estuarine delta system; this field is full of future challenges,

关键词： sea level rise behavior Anthropogenic geomorphologic change local tidal datum Flood management Adaptation

stability analyses of the mass abrasive projectile high-speed penetrating into a concrete target part III: Terminal ballistic trajectory analyses

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Acta Mechanica sinica 2015年第4期31卷 558-569页

作者： h.wu x.w.chen q.Fang x.z.Kong l.l.he Institute of systems Engineering China Academy of Engineering Physics state Key laboratory for Disaster prevention & Mitigation of Explosion & Impact PLA University of Science and Technology

During the high-speed penetration of projectiles into concrete targets （the impact velocity ranges from 1.0 to 1.5 km/s）, important factors such as the incident oblique and attacking angles, as well as the asymmetric abrasions of the projectile nose induced by the target-projectile interactions, may lead to obvious deviation of the terminal ballistic tra- jectory and reduction of the penetration efficiency. Based on the engineering model for the mass loss and nose-blunting of ogive-nosed projectiles established, by using the Differ- ential Area Force law （DAFl） method and semi-empirical resistance function, a finite differential approach was pro- grammed （pENTrA2D） for predicting the terminal ballistic trajectory of mass abrasive high-speed projectiles penetrating into concrete targets. It accounts for the free-surface effects on the dr.g force acting on the projectile, which are attributed to the oblique and attacking angles, as well as the asymmetric nose abrasion of the projectile. Its validation on the prediction of curvilinear trajectories of non-normal high-speed pene- trators into concrete targets is verified by comparison with available test data. relevant parametric influential analyses show that the most influential factor for the stability of ter- minal ballistic trajectories is the attacking angle, followed by the oblique angle, the discrepancy of asymmetric nose abrasion, and the location of mass center of projectile. The terminal ballistic trajectory deviations are aggravated as the above four parameters increase.

关键词： projectile penetration concrete Massabrasion Terminal ballistic trajectory

solid-state alloying of Al-Mg alloys by accumulative roll-bonding:Microstructure and properties

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Journal of Materials science & Technology 2022年第30期125卷 238-251页

作者： x.M.Mei q.s.Mei J.y.li c.l.li l.wan F.chen z.h.chen T.xu y.c.wang y.y.Tan school of power and Mechanical Engineering Wuhan UniversityWuhan 430072China Key laboratory of hydraulic Machinery Transients(wuhan university) Ministry of EducationWuhan 430072China school of Mechanical Engineering Wuhan Polytechnic UniversityWuhan 430023China

In this study,a novel solid-state alloying approach was adopted to fabricate Al-Mg alloys with high Mg contents(c_(Mg)) by accumulative roll-bonding(ArB)of Al and Mg elemental materials to ultrahigh *** results showed that the degree of alloying increased with the increase of ArB cycles and a supersaturatedα-Al solid solution accompanied with nanoprecipitates was formed in the Al-Mg alloys by ArB to 70 *** as-prepared Al-Mg alloys exhibited enhanced mechanical properties,with a maximum tensile strength of∼615 Mpa and a tensile elongation of∼10%at c_(Mg)=13 wt.%.The high strength can be attributed to different mechanisms,namely solid solution strengthening,grain boundary strengthening,dislocation strengthening,and precipitation *** Al-Mg alloys showed increased work hardening with increasing c_(Mg),due to the enhanced formation of ***,no obvious drop in the intergranular corrosion(Igc)resistance was found in the Al-Mg alloys with c_(Mg) up to 13 wt.%.Moreover,sensitization treatment was found to induce little decrease in the Igc resistance of the Al-Mg alloys with c_(Mg)≤13 wt.%.we found that the excellent Igc resistance was due to the suppression of grain boundary precipitation by the preferred formation of precipitates within the grains that were induced by *** study indicated the novelty of the present solid-state alloying approach to achieving a superior combination of high mechanical properties and Igc resistance in Al-Mg alloys.

关键词： solid-state alloying Al-Mg alloys Mechanical properties Igc resistance ArB

Discovery of new MAx-phase-like layered ternary carbide V_(8)p_(6)c:crystal structure,thermal expansion,and elastic properties

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Journal of Materials science & Technology 2024年第7期174卷 55-62页

作者： h.x.chen l.sheng z.l.zhang x.c.wen D.l.yang x.y.ye p.q.Dai school of Materials science and Engineering Fujian University of TechnologyFuzhou 350118China Beijing synchrotron radiation Facility Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China Fujian provincial Key laboratory of Advanced Materials processing and Application Fuzhou 350118China state Key laboratory of structural chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Due to the laminated structure,MAx phases and MAx-phase-like compounds possess outstanding dam-age tolerance capability with good thermal/electrical conductivity and other charming functional prop-erties,showing a br.ght future for structural-functional ***,a new MAx-phase-like ternary car-bide V_(8)p_(6)c with layered characteristics was *** to the alternate stacking of hexagonal-arranged M/A/x atom layers in MAx phases,V_(8)p_(6)c has a layered structure formed by a repeated stacking of the slabs consisting of V_(6)c-octahedrons and Vp 6-distorted-octahedrons in three-atomic layers *** thermal expansion anisotropy was revealed,with the thermal expansion coefficients(TEcs)along a-axis,c-axis,and the aver.ge value,equal toα_(a)=8.55(5)μK^(−1),α_(c)=10.23(5)μK^(−1),andα_(l)=9.14(5)μK^(−1),*** dilation along the c-axis was mainly dominated by out-plane V-p bonds be-tween layered *** to the pressure-dependent lattice parameters,the polycrystalline bulk modulus(B_(0)=185(9)gpa)and high compressibility anisotropy factor(B_(a)/B_(c)=1.64)was ***-while,the second-order elastic constants were calculated,and the elastic moduli,E=303 gpa,B=198 gpa,g=122 gpa,andν=0.246,were *** the weak connection between layer slabs by out-plane V1-p bond was revealed by the bond stiffness model,with a bond stiffness close to the M-A bond in MAx ***,good damage tolerance capability was predicted according to paugh’s ratio(g/B=0.616)and cauchy pressure(p_(a)=0 gpa,p_(c)=-7.5 gpa),even better than those of typical MAx *** discovery of V_(8)p_(6)c provides a new member of MAx-phase-like damage-tolerant ceramic with relatively low density,moderate thermal expansion,and anisotropic compressibility,and the unique lay-ered structure is inspiring for exploring new layered ternary ceramics.

关键词： New ternary carbide MAx phase Thermal expansion Elastic constants Anisotropy

DEFOrMATION BEhAVIOr OF AA6063 AlUMINIUM AllOy AFTEr rEMOVINg FrIcTION EFFEcT UNDEr hOT wOrKINg cONDITIONs

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Acta Metallurgica sinica(English letters) 2008年第6期21卷 451-458页

作者： z. y. chen s. q. xu x.h. Dong National Die ＆ Mold cAD Engineering research center Shanghai Jiaotong University Shanghai 200030 China college of Materials science and Engineering Taiyuan University of Technology Taiyuan 030024 China

The hot deformation behavior of AA6063 aluminium alloy has been investigated by means of compression tests at temperatures between 400 and 520℃, and strain rates ranging from 2.5 to 10 s^-1. Owing to the barreling, the theoretical model on the basis of hills general method is used to calculate the flow stress of a cylindrical specimen under uniaxial simple compression so as to consider the friction effect at the die-specimen interface. A method of evaluating the friction coefficient by combining compression tests with the finite element method is presented. The real flow behavior of AA6063 aluminium alloy can be described with sinh-Arrhenius equation. The hot deformation activation energy q derived from the corrected stress and strain data is 232. 350 kJ/mol.

关键词： Barreling compression test Friction Flow stress Aluminium alloy Activation energy