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Tailoring grain growth and solid solution strengthening of single-phase CrCoNi medium-entropy alloys by solute selection

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journal of Materials Science & Technology 2020年第19期54卷 196-205页

作者： G.W.hu L.C.zeng h.du X.W.Liu y.Wu P.Gong z.T.fan Q.hu E.P.George key Laboratory of Metallurgical Equipment and Control Technology Ministry of EducationWuhan University of Science and TechnologyWuhan 430081China hubei key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and TechnologyWuhan 430081China State key Laboratory of Materials Processing and die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China State key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Institute of Applied Physics Jiangxi Academy of SciencesNanchang 330029China Oak Ridge National Laboratory Materials Science and Technology DivisionOak RidgeTN37831USA department of Materials Science and Engineering University of TennesseeKnoxvilleTN37996USA

In the present study,we selected solutes to be added to the Cr Co Ni medium-entropy alloy(MEA)based on the mismatch of self-diffusion activation energy(SdQ)between the alloying elements and constituent elements of the matrix,and then investigated their grain growth behavior and mechanical *** and Al were selected as the solutes for investigation primarily because they have higher and lower SdQ,respectively,than those of the matrix elements;a secondary factor was their higher and lower shear *** concentrations were fixed at 3 at.%each because previous work had shown these compositions to be single-phase solid solutions with the face-centered cubic *** alloys were produced by arc melting,casting,homogenizing,cold rolling and annealing at various temperatures and times to produce samples with different grain *** were(a)the base alloy Cr Co Ni,(b)the base alloy plus 3 at.%Mo,and(c)the base alloy plus 3 at.%*** activation energies for grain growth of the Cr Co Ni,Cr Co Ni-3Mo and CrCo Ni-3Al MEAs were found to be^251,~368 and^219 k j/mol,respectively,consistent with the notion that elements with higher SdQ(in this study Mo)retard grain growth(likely by a solute-drag effect),whereas those with lower values(Al)accelerate grain *** roomtemperature tensile properties show that Mo increases the yield strength by^40%but Al addition has a smaller strengthening effect consistent with their relative shear *** yield strength as a function of grain size for the three single-phase MEAs follows the classical hall-Petch relationship with much higher slopes(>600 MPaμm-0.5)than traditional solid *** work shows that the grain growth kinetics and solid solution strengthening of the Cr Co Ni MEA can be tuned by selecting solute elements that have appropriate diffusion and physical properties.

关键词： Medium and high entropy alloys Solute-drag effect Microstructure Grain growth kinetics Solid solution strengthening

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Microstructural features of Ti-6Al-4V manufactured via high power laser directed energy deposition under low-cycle fatigue

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journal of Materials Science & Technology 2021年第24期83卷 18-33页

作者： y.M.Ren X.Lin h.O.yang h.Tan j.Chen z.y.jian j.Q.Li W.d.huang School of Materials and Chemical Engineering Xi’an Technological UniversityXi’an710021China State key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China

Laser additive manufacturing(LAM)technique has unique advantages in producing geometrically complex metallic ***,the poor low-cycle fatigue property(LCF)of LAM parts restricts its widely ***,the microstructural features of a Ti-6 Al-4 V alloy manufactured via high power laser directed energy deposition subjected to low-cycle fatigue loading were *** fatigue loading,the microstructure of the as-deposited parts was found to exhibit a non-homogeneous distribution of columnar prior-βgrains(200-4000μm)at various scanning velocities(300-1500 mm/min)and relatively coarseα-laths(1.0-4.5μm).Under cyclic loading,fatigue microcracks typically initiated within the alignedαphases in the preferred orientation(45°to the loading direction)at the surface of the fatigue *** Ti-6 Al-4 V exhibited a single straight dislocation character at low strain amplitudes(d dislocation dipoles or even tangled dislocations at high strain amplitudes(>1.1%).In addition,dislocation substructure features,such as dislocation walls,stacking faults,and dislocation networks,were also *** findings may provide opportunities to understand the fatigue failure mechanism of additive manufactured titanium parts.

关键词： Laser additive manufacturing directed energy deposition Titanium alloy Low-cycle fatigue Microstructure

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Origin of dispersed Organic Matter within Sandstones and Its Implication for Uranium Mineralization:A Case Study from dongsheng Uranium Ore Filed in China

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journal of Earth Science 2022年第2期33卷 325-341页

作者： fan zhang yangquan jiao Shuangming Wang Liqun Wu hui Rong key Laboratory of Tectonics and Petroleum Resources China University of GeosciencesMinistry of EducationWuhan 430074China School of Earth Resources China University of GeosciencesWuhan 430074China Xi’an University of Science and Technology Xi’an 710054China

Carbonaceous debris(Cd),common dispersed organic matter(i.e.,dOM),is widely disseminated in sandstones from uranium-bearing strata from the dongsheng uranium ore field of the northern Ordos *** of maceral,element and biomarkers of Cd were investigated through a series of methods with optical microscope,elemental analyzer and gas chromatography-mass spectrometry analyses(GC-MS)to study origin of *** results show that Cd,centrally distributed nearby channel erosion surface,decreases with the increased distances to channel erosion surface,which indicates the Cd might be related to the coal seam from the upper unit of the j2y Formation or synsedimentary plant from the j2z *** of Cd are composed of vitrinite(i.e.,V),inertinite(i.e.,I),and minerals,including that V is *** with the coals from the j2y Formation classed into vitrinertite-V(V+I>95%,V>I),Cd is grouped into vitrite(V>95%).Although,Cd and coal are similar in element composition,the former is of lower organic carbon,h,N,and higher ***(C27+C29)/(C31+C33)ratios of n-alkanes biomarkers indicate that the percentage of woody plants accounting for vegetation composition of Cd predominate over that of coal,which is also evidenced by the higher C/N ratios and oleanane contents of *** evidence is also supported by plant branch buried in *** distribution characteristics of Cd and differences in vegetation types between Cd and coal suggest that Cd might be not from the coal seam from *** tissue preservation index,gelification index,ground water level index,and vegetation index reflect that the paleoenvironment of Cd is controlled by fluctuating water,which is also supported by the existences of round *** with peat,sedimentary paleoenvironment where Cd deposits is of weaker reducibility,higher salinity by analyzing Pr/Ph ratios and gammacerane *** of n-alkanes carbon number of Cd with the presence of unknown complex mixtures show that m

关键词： carbonaceous debris vegetation types palaeoenvironment uranium mineralization Ordos Basin ore deposit geology

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Empirical model for estimating vertical concentration profiles of re-suspended, sediment-associated contaminants

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Acta Mechanica Sinica 2017年第5期33卷 846-854页

作者： h.W.zhu P.d.Cheng W.Li j.h.Chen y.Pang d.z.Wang Shanghai Investigation Design & Research Institute Co. Ltd Institute of Environmental Science and Engineering Hohai University key Laboratory for Mechanics in Fluid Solid Coupling System Institute of Mechanics Chinese Academy of Science Shanghai Institute of Applied Mathematics and Mechanics Shanghai University

Vertical distribution processes of sediment contaminants in water were studied by flume experiments. Experimental results show that settling velocity of sediment particles and turbulence characteristics are the major hydrodynamic factors impacting distribution of pollutants, especially near the bottom where particle diameter is similar in size to vortex structure. Sediment distribution was uniform along the distance, while contaminant distribution slightly lagged behind the sediment. The smaller the initial sediment concentration was, the more time it took to achieve a uniform concentration distribution for suspended sediment. A contaminants transportation equation was established depending on mass conservation equations. Two mathematical estimation models of pollutant distribution in the overlying water considering adsorption and desorption were devised based on vertical distribution of suspended sediment: equilibrium partition model and dynamic micro-diffusion model. The ratio of time scale between the sediment movement and sorption can be used as the index of the models. When this ratio was large, the equilibrium assumption was reasonable, but when it was small, it might require dynamic micro-diffusion model.

关键词： Sediment resuspension Pollutants Concentration distribution desorption Partition coefficient

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Microstructure and mechanical properties of Al-12Si and Al-3.5Cu-1.5Mg-1Si bimetal fabricated by selective laser melting

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journal of Materials Science & Technology 2020年第1期36卷 18-26页

作者： P.Wang C.S.Lao z.W.Chen y.k.Liu h.Wang h.Wendrock j.Eckert S.Scudino Additive Manufacturing Institute College of Mechatronics and Control EngineeringShenzhen UniversityNanhai Street 3688518060ShenzhenP.R.China Institute for Complex Materials IFW DresdenHelmholtzstraβe 20D-01069DresdenGermany Guangdong Provincial key Laboratory ofMicro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen University Nanhai Street 3688518060ShenzhenP.R.China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraJie 12A-8700LeobenAustria department of Materials Science Montanuniversitat LeobenJahnstraJSe 12A-8700LeobenAustria

An Al-12 Si/Al-3.5 Cu-1.5 Mg-1 Si bimetal with a good interface was successfully produced by selective laser melting(SLM).The SLM bimetal exhibits four successive zones along the building direction:an Al-12 Si zone,an interfacial zone,a texture-strengthening zone and an Al-Cu-Mg-Si *** interfacial zone(hick)displays an increasing size of the cells composed of eutectic Al-Si and a discontinuous cellular microstructure,resulting in the lowest hardness of the four *** texturestrengthening zone(around 0.3 mm thick)shows a remarkable variation of the hardness andfiber *** backscatter diffraction analysis shows that the grains grow gradually from the interfacial zone to the Al-Cu-Mg-Si zone along the building ***,a strongfiber texture develops at the Al-Cu-Mg-Si side of the interfacial zone and disappears gradually along the building *** bimetal exhibits a room temperature yield strength of 267±10 MPa and an ultimate tensile strength of 369±15 MPa with elongation of 2.6±0.1%,revealing the potential of selective laser melting in manufacturing dissimilar materials.

关键词： Selective laser melting Aluminum alloys Bimetals Microstructure Mechanical properties

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Gyroscopic modes decoupling method in parametric instability analysis of gyroscopic systems

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Acta Mechanica Sinica 2018年第5期34卷 963-969页

作者： y.j.Qian X.d.yang h.Wu W.zhang T.z.yang College of Mechanical Engineering Beijing University of TechnologyBeijing 100124China department of Mechanics Tianjing UniversityTianjing 300072China

Traditional procedures to treat vibrations of gyroscopic continua involve direct application of perturbation methods to a system with both a strong gyroscopic term and other weakly coupled *** this study,a gyroscopic modes decoupling method is used to obtain an equivalent system with decoupled gyroscopic modes having only weak *** the axially moving string as an example,the instability boundaries in the vicinity of parametric resonances are detected using both the traditional coupled gyroscopic system and our system with decoupled gyroscopic modes,and the results are compared to show the advantages and disadvantages of each method.

关键词： Axially moving material decoupling of gyroscopic modes Parametric instability Perturbation method Gyroscopic system

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Thermal stability and deformation mechanisms in Ni-Co-Fe-Cr-Al-Ti-Nb-type nanoparticle-strengthened high-entropy alloys

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journal of Materials Science & Technology 2023年第36期167卷 171-183页

作者： j.X.hou j.y.zhang j.X.zhang j.h.Luan y.X.Wang B.X.Cao y.L.zhao z.B.jiao X.j.Liu W.W.Song P.k.Liaw T.yang department of Materials Science and Engineering Hong Kong Institute for Advanced StudyCity University of Hong KongHong KongChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina Steel Institute RWTH Aachen UniversityAachen 52072Germany Institute of Materials Engineering University of KasselKassel 334125Germany department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996-2200USA City University of hong kong China

The precipitate morphologies,coarsening kinetics,elemental partitioning behaviors,grain structures,and tensile properties were explored in detail for L1_(2)-strengthened Ni_(39.9)Co_(20)Fe_(15)Cr_(15)Al_(6)Ti_(4-x)Nb_(x)B_(0.1)(x=0 at.%,2 at.%,and 4 at.%)high-entropy alloys(hEAs).By substituting Ti with Nb,the spheroidal-to-cuboidal precipitate morphological transition,increase in the coarsening kinetics,and phase decomposition upon aging at 800°C *** excessive addition of Nb brings about the grain boundary precipitation of an Nb-rich phase along with the phase decomposition from the L1_(2)to lamellar-structured d019 phase upon the long-term aging *** partially substituting Ti with Nb,the chemically complex and thermally stable L12 phase with a composition of(Ni_(58.8)Co_(9.8)Fe_(2.7))(Al_(12.7)Ti_(5.8)Nb_(7.5)Cr_(2.3))ensures the stable phase structure and clean grain boundaries,which guarantees the superb high-temperature mechanical properties(791±7 MPa for yielding and 1013±11 MPa for failure)at 700℃.Stacking faults(SFs)were observed to prevail during the plastic deformation,offering a high work-hardening capability at 700°*** anomalous rise in the yield strength at 800℃was found,which could be ascribed to the multi-layered super-partial dislocations with a cross-slip configuration within the L1_(2)particles.

关键词： high-entropy alloys Coarsening kinetics Coherent precipitation strengthening Mechanical properties

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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

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Genome-wide polymorphisms between the parents of an elite hybrid rice and the development of a novel set of PCR-based Indel markers

Genome-wide polymorphisms between the parents of an elite hy...

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2014年中国作物学会学术年会

作者： k.Wang j.y.zhuang d.R.huang j.z.ying y.y.fan Chinese National Center for Rice Improvement/State key Laboratory of Rice Biology China National Rice Research Institute

To discover whole genome-wide polymorphisms between zhenshan97(zS97) and Milyang46(My46),the parents of an elite three-line indica hybrid Shanyou 10,the whole-genome re-sequencing analysis of zS97 and My46 was done using Solexa sequencing *** dNA libraries were constructed and 9.91 G bases were generated and 84.04%high-quality raw databases were aligned with the reference sequence of the *** resulting consensus sequence of the two rice accessions covered 8.69%and 8.58%of the reference *** average,effective sequencing depths of 11.66× and 11.51× were achieved for zS97 and My46,respectively.A total of 364,488 single nucleotide polymorphisms(SNPs),61,181 insertions/deletions(Indels) and 6,298 structural variations(SVs)were detected in zS97 and 364,179 SNPs,61,984 Indels and 6,408 SVs were detected in My46,compared to the 9311 reference *** average density of dNA polymorphisms detected per 500 kb across the genome in zS97 and My46 was similar with 486.6 and 486.2 SNPs,81.7 and 82.7 Indels and 8.4 and 8.6SVs,*** analysis of the variation revealed a total of 77,013 identical and 181,737 different SNPs and 15,021 identical and 1,205 different Indels between zS97 and My46,respectively.A total of 180 Indels 3-8 bp in length between zS97 and My46 were selected for experimental validation;160 PCR products were efficiently separated on 6%non-denaturing polyacrylamide electrophoresis *** of genome-wide variation among the parents of the elite hybrid as well as the set of 160 PCR-based Indel markers will facilitate future genetic studies and the molecular breeding of hybrid rice.

关键词： Genome-wide polymorphisms SNPs Indels Re-sequencing hybrid rice

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Molecular beam epitaxy growth of monolayer hexagonal MnTe_(2)on Si(111)substrate

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Chinese Physics B 2021年第12期30卷 142-147页

作者： S Lu k Peng P d Wang A X Chen W Ren X W fang y Wu z y Li h F Li F y Cheng k L Xiong j y yang j z Wang S A ding y P jiang) L Wang Q Li F S Li L F Chi Institute of Functional Nano&Soft Materials(FUNSOM) Soochow UniversitySuzhou 215123China Vacuum Interconnected Nanotech Workstation(Nano-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of Sciences(CAS)Suzhou 215123China key Laboratory of Polar Materials and devices(MOE) Department of ElectronicSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Physical Science and Technology Southwest UniversityChongqing 400715China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China

Monolayer MnTe_(2)stabilized as 1 T structure has been theoretically predicted to be a two-dimensional(2 d)ferromagnetic metal and can be tuned via strain *** is no naturally van der Waals(vdW)layered MnTe_(2)bulk,leaving mechanical exfoliation impossible to prepare monolayer MnTe_(2).herein,by means of molecular beam epitaxy(MBE),we successfully prepared monolayer hexagonal MnTe_(2)on Si(111)under Te rich *** reflection high-energy electron diffraction(RhEEd)and low-energy electron diffraction(LEEd)patterns suggest the monolayer is atomically flat without surface *** valence state of Mn^(4+)and the atom ratio of([Te]:[Mn])further confirm the MnTe_(2)*** tunneling spectroscopy(STS)shows the hexagonal MnTe_(2)monolayer is a semiconductor with a large bandgap of~2.78 *** valence-band maximum(VBM)locates at theΓpoint,as illustrated by angle-resolved photoemission spectroscopy(ARPES),below which three hole-type bands with parabolic dispersion can be *** successful synthesis of monolayer MnTe_(2)film provides a new platform to investigate the 2d magnetism.

关键词： molecular beam epitaxy hexagonal MnTe_(2) band structure

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