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Overcoming the strength-ductility trade-off by tailoring grain-boundary metastable Si-containing phase in β-type titanium alloy

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Journal of materials Science & Technology 2021年第9期68卷 112-123页

作者： x.Luo L.h.Liu C.yang h.z Lu h.W.ma z.wang d.d.Li L.C.zhang y.y.Li National Engineering Research Center of Near-net-shape Forming for metallic materials South China University of TechnologyGuangzhou510640China State Key Laboratory of materials processing and die&mould Technology Huazhong University of Science and TechnologyWuhan430074China Key Laboratory of Automobile materials of mOE Department of Materials ScienceJilin UniversityChangchun130012China School of Engineering Edith Cowan University270Joondalup DriveJoondalupPerthWA 6027Australia

It is well accepted that grain-boundary phases in metallic alloys greatly deteriorate the mechanical *** our work,we report on a novel strategy to prepare high strength-ductility β-type(Ti69.71 Nb23.72zr4.83Ta1.74)97Si3(at.%)(TNzTS) alloys by tailoring grain-boundary metastable Si-containing ***,the thin shell-shaped metastable S1 phase surrounding the columnar β-Ti grain was intercepted successfully via nonequilibrium rapid solidification achieved by selective laser melting(SLm).Subsequently,the thin shell-shaped metastable(Ti,Nb,zr)5 Si3(called S1) phase was transformed into globular(Ti,Nb,zr)2 Si(called S2) phase by the solution heat ***,the globular S2 phases reinforced TNzTS alloy exhibits ultrahigh yield strength of 978 mpa,ultimate strength of 1010 mpa and large elongation of 10.4 %,overcoming the strength-ductility trade-off of TNzTS alloys by various ***,the reported yield strength herein is 55 % higher than that of conventionally forged TNzT *** analysis indicates the globularization process of the metastable S1 phase is controlled by the model of termination *** quantitative analysis on strengthening mechanism demonstrates that the increase in yield strength of the heat-treated alloys is mainly ascribed to the strengthening of the precipitated silicide and the dislocations induced by high cooling *** obtained results provide some basis guidelines for designing and fabricating β-titanium alloys with excellent mechanical properties,and pave the way for biomedical application of TNzTS alloy by SLm.

关键词： Selective laser melting βtitanium alloys heat treatment

Recent development of chemically complex metallic glasses: from accelerated compositional design, additive manufacturing to novel applications

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materials Futures 2022年第1期1卷 9-31页

作者： J y zhang z Q zhou z B zhang m h park Q yu z Li J ma A d wang h G huang m Song B S Guo Q wang y yang department of mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China Shenzhen Key Laboratory of high performance Nontraditional manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhenGuangdong 518060People’s Republic of China School of materials Science and Engineering Dongguan University of TechnologyDongguanGuangdong 523808People’s Republic of China Institute of materials China Academy of Engineering PhysicsJiangyouSichuan 621907People’s Republic of China State Key Laboratory of powder metallurgy Central South UniversityChangshaHunan 410083People’s Republic of China Institute of Advanced Wear&Corrosion Resistant and Functional materials Jinan UniversityGuangzhouGuangdong 510632People’s Republic of China Institute of materials Laboratory for MicrostructuresShanghai UniversityShanghai 200444People’s Republic of China department of materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China department of Advanced design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongPeople’s Republic of China

metallic glasses(mGs)or amorphous alloys are an important engineering material that has a history of research of about 80–90 *** different fast cooling methods were developed for multi-component mGs between 1960s and 1980s,1990s witnessed a surge of research interest in the development of bulk metallic glasses(BGms).Since then,one central theme of research in the metallic-glass community has been compositional design that aims to search for mGs with a better glass forming ability,a larger size and/or more interesting properties,which can hence meet the demands from more important *** this review article,we focus on the recent development of chemically complex mGs,such as high entropy mGs,with new tools that were not available or mature yet until recently,such as the state-of-the-art additive manufacturing technologies,high throughput materials design techniques and the methods for big data analyses(*** learning and artificial intelligence).We also discuss the recent use of mGs in a variety of novel and important applications,from personal healthcare,electric energy transfer to nuclear energy that plays a pivotal role in the battle against global warming.

关键词： metallic glasses amorphous alloys alloy design additive manufacturing machine learning high throughput materials design

Wavelet analysis of stagnation point flow of non-Newtonian nanofluid

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Applied mathematics and mechanics(English Edition) 2019年第8期40卷 1211-1226页

作者： m.hAmId m.USmAN R.U.hAQ4 z.h.KhAN wei wang School of mathematical Sciences Peking UniversityBeijing 100871China BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering SciencePeking UniversityBeijing 100871China department of Electrical Engineering Bahria UniversityIslamabad 44000Pakistan State Key Laboratory of hydraulics and mountain River Engineering College of Water Resource & HydropowerSichuan UniversityChengdu 610065China Key Laboratory of Advanced Reactor Engineering and Safety Ministry of Education Tsinghua UniversityBeijing 100084China

The wavelet approach is introduced to study the influence of the natural convection stagnation point flow of the Williamson fluid in the presence of thermophysical and Brownian motion effects. The thermal radiation effects are considered along a permeable stretching surface. The nonlinear problem is simulated numerically by using a novel algorithm based upon the Chebyshev wavelets. It is noticed that the velocity of the Williamson fluid increases for assisting flow cases while decreases for opposing flow cases when the unsteadiness and suction parameters increase, and the magnetic effect on the velocity increases for opposing flow cases while decreases for assisting flow cases. When the thermal radiation parameter, the dufour number, and Williamson’s fluid parameter increase, the temperature increases for both assisting and opposing flow cases. meanwhile, the temperature decreases when the prandtl number increases. The concentration decreases when the Soret parameter increases, while increases when the Schmidt number increases. It is perceived that the assisting force decreases more than the opposing force. The findings endorse the credibility of the proposed algorithm, and could be extended to other nonlinear problems with complex nature.

关键词： Williamson nanofluid heat and mass transfer stagnation point flow assisting and opposing flow Chebyshev wavelet method

Enhanced localized and uniform corrosion resistances of bulk nanocrystalline 304 stainless steel in high-concentration hydrochloric acid solutions at room temperature

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Journal of materials Science & Technology 2018年第12期34卷 2498-2506页

作者： S.G.wang m.Sun y.h.xu K.Long z.d.zhang Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of Sciences

The localized and uniform corrosion resistances of bulk nanocrystalline 304 stainless steel（NC-304 SS）produced by severe rolling technique, and its conventional polycrystalline 304 stainless steel（CC-304 SS）counterpart, were investigated in high-concentration hydrochloric acid solutions at room ***-304 SS can scarcely suffer from localized corrosion in 4 mol/L and 5 mol/L hCl solutions during 5-day immersion tests, and in 1-3 mol/L hCl solutions during thirty-five-day immersion tests. The corrosion rate of NC-304 SS was also less than that of CC-304 SS during these immersion tests. The improved localized and uniform corrosion resistances of NC-304 SS were explained in terms of the adsorption and chemical activity of Cl;on NC-304 SS and CC-304 SS characterized by x-ray photoelectron spectroscopy,and the valence electron configurations of NC-304 SS and CC-304 SS were characterized by ultra-violet photoelectron spectroscopy rather than conventional electrochemical results.

关键词： Stainless steels Localized corrosion Severe rolling technique x-ray photoelectron spectroscopy Ultra-violet photoelectron spectroscopy

Long-period grating inscription on polymer functionalized optical microfibers and its applications in optical sensing

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photonics Research 2016年第2期4卷 45-48页

作者： z.y.xu y.h.Li L.J.wang Joint Institute for measurement Science Tsinghua University Shanghai Institute of Laser plasma State Key Laboratory of precision measurement Technology and Instruments Tsinghua University

We demonstrated long-period grating(LpG) inscription on polymer functionalized optical microfibers and its applications in optical sensing. Optical microfibers were functionalized with ultraviolet-sensitive polymethyl methacrylate jackets and, thus, LpGs could be inscribed on optical microfibers via point-by-point ultraviolet laser exposure. For a 2 mm long microfiber LpG(mLpG) inscribed on optical microfibers with a diameter of 5.4 μm, a resonant dip of 15 d B at 1377 nm was observed. This mLpG showed a high sensitivity of strain and axial force, i.e.,-1.93 pm∕με and-1.15 pm∕μN, respectively. Although the intrinsic temperature sensitivity of the LpGs is relatively low, i.e.,-12.75 pm∕°C, it can be increased to be-385.11 pm∕°C by appropriate sealing. Benefiting from the small footprint and high sensitivity, mLpGs could have potential applications in optical sensing of strain,axial force, and temperature.

关键词： mLpG Long-period grating inscription on polymer functionalized optical microfibers and its applications in optical sensing

Exploring the link between brain topological resilience and cognitive performance in the context of aging and vascular risk factors:A cross-ethnicity population-based study

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Science Bulletin 2024年第17期69卷 2735-2744页

作者： hao Liu Jing Jing Jiyang Jiang wei Wen Wanlin zhu zixiao Li yuesong pan xueli Cai Chang Liu yijun zhou xia meng yilong wang hao Li yong Jiang huaguang zheng Suying wang haijun Niu Nicole Kochan henry Brodaty Tiemin wei perminder S.Sachdev yubo Fan Tao Liu yongjun wang Beijing Advanced Innovation Center for Biomedical Engineering School of Biological Science and Medical EngineeringBeihang UniversityBeijing 100191China China National Clinical Research Center for Neurological diseases Beijing 100070China department of Neurology Beijing Tiantan HospitalCapital Medical UniversityBeijing 100070China Neuropsychiatric Institute Prince of Wales HospitalSydney NSW 2031Australia Centre for healthy Brain Ageing(CheBA) Discipline of Psychiatry and Mental HealthSchool of Clinical MedicineUNSW MedicineSydney NSW 2052Australia department of Neurology Lishui HospitalZhejiang University School of MedicineLishui 323000China Cerebrovascular Research Lab Lishui HospitalZhejiang University School of MedicineLishui 323000China department of Cardiology Lishui HospitalZhejiang University School of MedicineLishui 323000China

Brain aging is typically associated with a significant decline in cognitive *** risk factors(VRF)and subsequent atherosclerosis(AS)play a major role in this *** resilience reflects the brain’s ability to withstand external perturbations,but the relationship of brain resilience with cognition during the aging process remains ***,we investigated how brain topological resilience(BTR)is associated with cognitive performance in the face of aging and vascular risk *** used data from two cross-ethnicity community cohorts,polyvasculaR Evaluation for Cognitive Impairment and Vascular Events(pRECISE,n=2220)and Sydney memory and Ageing Study(mAS,n=246).We conducted an attack simulation on brain structural networks based on k-shell decomposition and node degree *** was defined based on changes in the size of the largest subgroup of the network during the simulation ***,we explored the negative correlations of BTR with age,VRF,and AS,and its positive correlation with cognitive ***,using structural equation modeling(SEm),we constructed path models to analyze the directional dependencies among these variables,demonstrating that aging,AS,and VRF affect cognition by disrupting *** results also indicated the specificity of this metric,independent of brain ***,these findings underscore the supportive role of BTR on cognition during aging and highlight its potential application as an imaging marker for objective assessment of brain cognitive performance.

关键词： Brain resilience Vascular risk factors Cognition decline K-shell decomposition Network attack simulation

Erratum to “plant defense against Necrotrophic pathogens” [American Journal of plant Sciences 11(12) (2020) 2122-2138]

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American Journal of plant Sciences 2024年第2期15卷 122-138页

作者： mahmoud h. Ghozlan Nikita Gambhir Eman EL-Argawy Serkan Tokgöz dilip K. Lakshman Amitava mitra University of Nebraska Lincoln NE USA USdA-ARS Beltsville MD USA

The original online version of this article (Ghozlan, m.h., EL-Argawy, E., Tokgöz, S., Lakshman, d.K. and mitra, A. (2020) plant defense against Necrotrophic pathogens. American Journal of plant Sciences, 11, 2122-2138. https://***/10.4236/ajps.2020.1112149) was published mistakenly without another co-author, Nikita Gambhir. In this regard, we revise authors and “how to cite” sections by adding her name.

关键词： Effectors host Immunity Signaling p/mAmp ETI disease Resistance

Close major-merger pairs at z=0: Star-forming Galaxies with pseudobulges

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Research in Astronomy and Astrophysics 2024年第5期24卷 35-60页

作者：何川徐聪 Ute Lisenfeld 戴昱方陶陶黄家声王炜余清正 Chinese Academy of Sciences South America Center for Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China departamento de Física Teórica y del Cosmos Universidad de Granada18071 GranadaSpain Instituto Carlos I de Física Téorica y Computacional Facultad de Ciencias18071 GranadaSpain department of Astronomy Xiamen UniversityXiamen 361005China CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China

We present a study of star-forming galaxies (SFGs) with pseudobulges (bulges with Sérsic index n2σ) mean of specific star formation rate (sSFR) enhancement (sSFR_(enh)=0.33±0.07 versus sSFR_(enh)=0.12±0.06) and br... 详细信息

We present a study of star-forming galaxies (SFGs) with pseudobulges (bulges with Sérsic index nmajor-merger galaxy pair sample (h-KpAIR).With data from new aperture photometries in the optical and near-infrared bands (aperture size of 7 kpc) and from the literature,we find that the mean Age of central stellar populations in Spirals with pseudobulges is consistent with that of disky galaxies and is nearly constant against the bulge-to-total ratio (B/T).paired Spirals have a slightly lower fraction of pure disk galaxies (B/T≤0.1) than their counterparts in the control *** to SFGs with classical bulges,those with pseudobulges have a higher (>2σ) mean of specific star formation rate (sSFR) enhancement (sSFR_(enh)=0.33±0.07 versus sSFR_(enh)=0.12±0.06) and broader scatter (by~1 dex).The eight SFGs that have the highest sSFR_(enh)in the sample all have pseudobulges.A majority (69%) of paired SFGs with strong enhancement (having sSFR more than5 times the median of the control galaxies) have *** Spitzer data show that the pseudobulges in these galaxies are tightly linked to nuclear/circum-nuclear *** SFGs in S+S and in S+E pairs have significantly (>3σ) different sSFR enhancement,with the means of sSFR_(enh)=0.45±0.08 and-0.04±*** find a decrease in the sSFR enhancements with the density of the environment for SFGs with *** a high fraction (5/11) of pseudobulge SFGs in S+E pairs are in rich groups/clusters (loca density N_(1mpc)≥7),the dense environment might be the cause for their low s SFR_(enh).

关键词： galaxies evolution-galaxies interactions-galaxies star formation-galaxies structure-galaxies bulges-galaxies photometry

An effective approach for bonding of Tzm and Nb-zr system:microstructure evolution,mechanical properties,and bonding mechanism

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Journal of materials Science & Technology 2021年第25期84卷 16-26页

作者： z.W.yang J.m.Lin J.F.zhang Q.W.Qiu y.wang d.p.wang J.Song Tianjin Key Lab of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin300072China department of mining and materials Engineering McGill UniversityMontréalQuébecH3A 0C5Canada

A novel method of liquid metallic film(LmF)bonding was developed to join titanium zirconium molybdenum alloy(Tzm)and Nb-zr alloy with a Ni *** this method,a Ni-zr liquid phase was formed by the eutectic reaction and then squeezed out from the gap due to a transient pressure,leaving an *** not only achieved a reliable metallurgical bonding but also served as a transition layer between Tzm and Nb-zr alloy to reduce the mismatch between them thus further improving its *** bonding mechanism of the Tzm and Nb-zr system was discussed based on theoretical calculation and high-resolution microscopy *** advantages of this method were established by comparing the microstructure and mechanical properties of LmF bonded joints with that of traditional contact-reaction brazing and direct diffusion ***,the feasibility of the LmF bonding method was also demonstrated by the reliable joining of other high-temperature and immiscible systems.

关键词： Bonding Titanium zirconium molybdenum alloy(Tzm) diffusion microstructure mechanical properties