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Achieving excellent strength-ductility synergy in twinned NiCoCr medium-entropy alloy via Al/Ta co-doping

Journal of Materials Science & Technology 2021年第28期87卷 184-195页

作者： D.D.Zhang h.Wang J.Y.Zhang h.xue G.Liu J.Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049PR China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu610041PR China

Alloying is an effective strategy to tailor microstructure and mechanical properties of metallic materials to overcome the strength-ductility trade-off *** this work,we combined a novel alloy design principle,*** pronounced solid solution hardening(SSh)based on the misfit volumes engineering,and simultaneously,architecting the ductile matrix based on the valence electron concentrations(VEC)criterion,to fulfill an excellent strength-ductility synergy for the newly emerging high/medium-entropy alloys(hEAs/MEAs).Based on this strategy,Al/Ta co-doping within NiCoCr MEA leads to an efficient synthetic approach,that is minor Al/Ta co-doping not only renders significantly enhanced strength with notable SSh effect and ultrahigh strain-hardening capability,but also sharply refines grains and induces abnormal twinning behaviors of(NiCoCr)_(92)Al_(6)Ta_(2) *** with the partially twinned NiCoCr MEA,the yield strength(σy)and ultimate tensile strength(σUTS)of fully twinned Al/Ta-containing MEA were increased by~102%to~600 MPa and~35%to~1000 MPa,respectively,along with good ductility beyond 50%.Different from the NiCoCr MEA with deformation twins(DTs)/stacking faults(SFs)dominated plasticity,the extraordinary strain-hardening capability of the solute-hardened(NiCoCr)_(92)Al_(6)Ta_(2) MEA,deactivated deformation twinning,originates from the high density of dislocation walls,microbands and abundance of *** abnormal twinning behaviors,i.e.,prevalence of annealing twins(ATs)but absence of DTs in(NiCoCr)_(92)Al_(6)Ta_(2) MEA,are explained in terms of the relaxation of grain boundaries(for ATs)and the twinning mechanism transition(for DTs),respectively.

关键词： Medium-entropy alloys Mechanical properties Solid solution hardening Twinning behavior Strength-ductility synergy

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A strong and ductile NiCoCr-based medium-entropy alloy strengthened by coherent nanoparticles with superb thermal-stability

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Journal of Materials Science & Technology 2023年第1期132卷 201-212页

作者： D.D.Zhang J.Kuang h.xue J.Y.Zhang G.Liu J.Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

In this work,we designed a novel NiCoCr-based medium-entropy alloy(MEA)strengthened by coher-ent L12-nanoparticles,i.e.,(NiCoCr)92 Al 6 Ta 2(at.%).The strengthening and deformation mechanisms of the material and the coarsening kinetics of the coherent precipitates were systematically *** results indicated that giant precipitation hardening and its synergy with other strengthening contributors confer on the aged material a yield strength as high as 1.0 ***,a unique particle-features-dependent plasticity mechanism was revealed in this *** is,the alloy with a lower volume frac-tion,denser distribution,and finer particles mainly deformed by dislocation planar slip,otherwise,stack-faults-mediated plasticity was favored,rationalized by the cooperative/competitive effect of stack-fault energy,spatial confinement,and applied ***,the coarsening behavior of precipitate fol-lowed a modified Lifshitz-Slyozov-Wagner(LSW)model,and the nanoparticles displayed remarkably su-perior thermal stability compared to most traditional superalloys and reported multicomponent *** superb coarsening resistance of precipitate originated from the coupled effect of intrinsic sluggish diffusion in multi-principal alloys and the dual-roles of Ta species as a precipitate *** work provides a new pathway to develop strong-yet-ductile multicomponent alloys as promising candidates for high-temperature applications.

关键词： Medium-entropy alloy Mechanical properties Precipitation hardening Deformation mechanisms Coarsening kinetics

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Simulations of the QBO-like Oscillations based on gravity wave parameterization in WACCM model

Simulations of the QBO-like Oscillations based on gravity wa...

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2014年中国地球科学联合学术年会——专题29：空间天...

作者： C.Yu X.-h.xue X.K.Dou CAS Key Laboratory of Geospace Environment Department ofGeophysics and Planetary Sciences University of Science and Technology of China

The quasi-biennial oscillation（QBO）exists in the equatorial stratosphere with periods from about 22 to34 *** is believed to be forced by both the equatorial waves and smaller-scale gravity *** the basic forcing mechanism of QBO is well understood,it is still a challenge to simulate it in the Whole Atmosphere Community Climate Model（WACCM）.xue et *** simulated QBO in WACCM successfully by including a parameterized Inertial Gravity Wave（IGW）spectrum despite some differences compared with the *** this work we improve the model by importing a more realistic double Gaussian distribution IGW spectrum,which is calculated from the radiosonde *** simulations indicate that the IGW forcing from the previous and the new improved scheme are both capable to generate wind oscillations with a downward phase progression in the *** magnitude of the oscillation depends on the spectrum *** the period of the oscillation relates both to the width and strength of the Gauss *** new spectrum also affects the wave breaking level and acceleration *** addition,the resolved equatorial waves in WACCM,including Kelvin waves,Rossby-Gravity waves,and inertial gravity waves（IGWs）are weak compared to those extracted from reanalysis,i.e.,the wave forcing by resolved waves comes mostly from wavenumber 1 and 2 *** the vertical resolution of the model to check whether the coarse spatial resolution of WACCM can lead to the dissipation of equatorial waves.

关键词： equatorial waves oscillation gravity wave resolution

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Parameterization of the inertial gravity waves and generation of the quasi-biennial oscillation

Parameterization of the inertial gravity waves and generatio...

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中国空间科学学会空间物理学专业委员会第十五届全国日地空间物理学研讨会

作者： X.-h.xue h.-L.Liu X.-K.Dou CAS Key Laboratory of Geospace Environment Department of eophysics and Planetary SciencesUniversity of Science and Technology of China Mengcheng National Geophysical Observatory School of Earth and Space SciencesUniversity of Science and Technology of China high Altitude Observatory National Center for Atmospheric ResearchBoulderColoradoUSA.

In this work we extend the gravity wave parameterization scheme currently used in the Whole Atmosphere Community Climate Model(WACCM),which is based upon Lindzen’s linear saturation theory,by including the Coriolis effect to better describe the inertia-gravity waves(IGW).We perform WACCM simulations to study the generation of quatorial oscillations of the zonal mean zonal winds by including a spectrum of IGWs,and the parametric dependence of the wind oscillation on the IGWs and the effect of the new *** simulations demonstrate that the parameterized IGW forcing from the standard and the new scheme are both capable of generating equatorial wind oscillations with a downward phase progression in the stratosphere using the standard spatial resolution settings in the current *** period of the oscillation is dependent on the strength of the IGW forcing,and the magnitude of the oscillation is dependent on the width of the wave *** new parameterization affects the wave breaking level and acceleration rates mainly through changing the critical *** quasi-biennial oscillations(QBO)can be internally generated with the proper selection of the parameters of the *** characteristics of the wind oscillations thus generated are compared with the observed *** experiments demonstrate the need to parameterize IGWs for generating the QBO in General Circulation Models(GCMs).

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基于MRI影像组学特征无创预测低级别胶质瘤病人的总体生存率和化疗效果

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国际医学放射学杂志 2021年第3期44卷 367-368页

作者： J.T.Wang X.J.Zheng J.L.Zhang h.xue L.J.Wang R.Jing 卢明明

摘要目的建立并验证一种基于影像组学特征的方法来预测低级别胶质瘤病人的总体生存率和化疗效果。方法从横断面液体衰减反转恢复（FLAIR）影像和增强T1W(CE-

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等密度胰岛素瘤在双期增强CT扫描:发生率、临床病理特征及灌注特征

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国际医学放射学杂志 2016年第6期 713-714页

作者： L.Zhu h.xue h.Sun X.Wang Y.he Z.Jin 刘怀贵 Department of Radiology Peking Union Medical College Hospital

摘要目的本研究旨在确定等密度胰岛素瘤的发生率,探讨其临床病理特征并评估其区域血流灌注特征。方法本研究经伦理委员会批准并免除知情同意。从2010年7月—

关键词：胰岛素瘤临床病理特征等密度发生率 CT

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Mechanisms behind the surprising observation of supra-thermal ions in NIF’s fusion burning plasmas

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Science Bulletin 2025年第3期70卷 359-364页

作者： Yuhan xue Dong Wu Jie Zhang Key Laboratory for Laser Plasmas and Department of Physics and Astronomy Collaborative Innovation Center of IFSA(CICIFSA)Shanghai Jiao Tong UniversityShanghai 200240China Institute of Physics Chinese Academy of SciencesBeijing 100190China

Although ignition had been achieved at the National Ignition Facility(NIF),recent observations of the experiments indicate novel physics that beyond theoretical predictions emerge,e.g.,the neutron analysis of experiments has revealed deviations from the Maxwellian distributions in ion relative kinetic energies of burning plasmas,with the surprising emergence of supra-thermal deuterium and tritium(DT)ions that fall outside the predictions of macroscopic statistical hydrodynamic *** our newly developed hybrid-particle-in-cell code,incorporating the newly-proposed model of large-angle collisions,we infer that that this could be attributed to the increased significance of large-angle collisions among DT ions andα-particles in the burning *** and unprecedented kinetic investigations into the implications of large-angle collisions in the burning plasma have yielded several key findings,including an ignition moment promotion by~10 ps,the presence of supra-thermal ions below an energy threshold,and approximately twice the expected deposition ofα-particles *** rationality of our findings is confirmed through the congruency between the neutron spectral moment analyses conducted by the NIF and our kinetic simulations,both highlighting progressively widening disparities between neutron spectral moment analyses and hydrodynamics predictions,which becomes more pronounced as the yield *** kinetic simulations with large-angle collisions not only provide novel insights for experiment interpretation but also open new research opportunities for the largely unexplored regime of the nuclear burning plasmas,which are distinguished by their exceptionally high energy densities and hold immense potential for illuminating the intricate physics that underpins the evolution of the early universe.

关键词： lon kinetics Supra-thermal ions Large-angle collisions Non-equilibrium ignition Inertial confinement fusion Burning plasmas

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Targeting cholesterol trafficking to mitigate axonal degeneration in hereditary spastic paraplegia

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Neural Regeneration Research 2025年第5期20卷 1397-1398页

作者： Zhenyu Chen xue-Jun Li Department of Biomedical Sciences University of Illinois College of Medicine RockfordRockfordILUSA Department of Bioengineering University of Illinois at ChicagoChicagoILUSA

Axonal degeneration underlies many debilitating diseases including hereditary spastic paraplegia(hSP),a genetically and clinically diverse group of disorders characterized by spasticity and weakness of the lower *** is one significant cause of chronic neurodisability due to the lack of effective treatments and a wide range of onset ages from early childhood to 70 years.

关键词： degeneration diseases hereditary

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PbrMYB4,a R2R3-MYB protein,regulates pear stone cell lignification through activation of lignin biosynthesis genes

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horticultural Plant Journal 2025年第1期11卷 105-122页

作者： Dongliang Liu Yongsong xue Runze Wang Bobo Song Cheng xue Yanfei Shan Zhaolong xue Jun Wu College of horticulture State Key Laboratory of Crop Genetics&Germplasm Enhancement and UtilizationNanjing Agricultural UniversityNanjingJiangsu 210095China Anhui Provincial Key Laboratoryof horticultural Crop Quality Biology Schoolof HorticultureAnhui Agricultural UniversityHefeiAnhui 230036 China State Key Laboratory of Crop Biology College of Horticulture Science and EngineeringShandong Agricultural UniversityTai'anShandong 271018China

Pear(Pyrus bretschneideri)fruit stone cells are primarily composed of lignin and have strongly lignified cell *** presence of stone cells has a negative influence on fruit texture and taste,and thus the reduction of stone cell content in pear fruit is a key goal of breeding ***,research into the key transcription factors and regulatory networks associated with pear fruit stone cell formation have been *** here used a combination of co-expression network and expression quantitative trait locus(eQTL)analyses in 206 pear cultivars with different stone cell contents to identify relevant genes;these analyses uncovered the gene PbrMYB4,a R2R3 MYB transcription factor *** was a strong positive correlation between relative PbrMYB4 expression levels in the fruit flesh and stone cell/lignin *** of PbrMYB4 significantly increased the lignin contents,whereas silencing of PbrMYB4 had the opposite effect,decreasing the contents of ***4 overexpression in pear calli significantly promoted lignin *** Arabidopsis thaliana,PbrMYB4 overexpression resulted in increasing lignin deposition,cell wall thickness of vessels and xylary fiber,and accelerating expression level of lignin biosynthetic ***4 was found to activate 4-Coumarate:Coenzyme A Ligase(Pbr4CL1)by binding to AC-I elements in the promoter regions,as demonstrated with dual-luciferase reporter assays and a yeast one-hybrid *** results demonstrated that PbrMYB4 positively regulated lignin biosynthesis in pear fruit stone cells by activating lignin biosynthesis *** study improves our understanding of the gene regulatory networks associated with stone cell formation in pear fruit,providing guidance for molecular breeding of pear varieties with low stone cell content.

关键词： Pear Stone cell R2R3-MYBs Lignin

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Perspectives on additive manufacturing for warhead applications

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Defence Technology(防务技术) 2025年第1期43卷 225-251页

作者： hao xue Qiang Zhou Chuan Xiao Guangyan huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Ordnance Science and Research Academy of China Beijing 100089China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

According to different damage modes,warheads are roughly divided into three types:fragmentation warheads,shaped charge warheads,and penetrating *** to limitations in material and structural manufacturing,traditional manufacturing methods make it difficult to fully utilize the damage ability of the *** manufacturing(AM)technology can fabricate complex structures,with classified materials composition and customized components,while achieving low cost,high accuracy,and rapid production of the *** maturity of AM technology has brought about a new round of revolution in the field of *** this paper,we first review the principles,classifications,and characteristics of different AM *** development trends of AM technologies are pointed out,including multi-material AM technology,hybrid AM technology,and smart AM *** our survey,PBF,DED,and EBM technologies are mainly used to manufacture warhead damage *** and DIW technologies are mainly used to manufacture warhead ***,the research on the application of AM technology in three types of warhead and warhead charges was reviewed and the existing problems and progress of AM technologies in each warhead were ***,we summarized the typical applications and look forward to the application prospects of AM technology in the field of warheads.

关键词： Additive manufacturing Fragmentation warhead Shaped charge warhead Penetrating warhead Warhead charge

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