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Dynamic mechanical properties,deformation and damage mechanisms of eutectic high-entropy alloy AlCoCrFeni_(2.1)under plate impact

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Journal of Materials science & Technology 2023年第3期134卷 178-188页

作者： s.P.Zhao Z.D.Feng L.X.Li X.J.Zhao L.Lu s.Chen n.B.Zhang Y.Cai s.n.luo The Peac Institute of Multiscale sciences ChengduChina Key Laboratory of Advanced Technologies of Materials Ministry of EducationSouthwest Jiaotong UniversityChengduChina

shock compression and spallation of a eutectic high-entropy alloy(HEA)AlCoCrFeni_(2.1)with lamellar structure are investigated via plate impact loading with free-surface velocity *** as-cast and postmortem samples are characterized with transmission electron microscopy,electron back-scatter diffraction and scanning electron *** accurate Hugoniot equation of state is ***-ter shock compression to∼12 GPa,both the L1_(2)and B_(2)phases retain their ordered *** dislocations in the{111}slip planes,stacking faults and deformation twins are found in the L1_(2)phase,along with fewer dislocations in the{110}slip bands in the B(2)***-induced deformation twin-ning within the L1_(2)phase of this HEA is observed as a new deformation mechanism under various load-ing *** spallation,both ductile and brittle damage modes are *** micro voids and cracks prefer to nucleate at the phase boundaries chiefly,then in the B(2)*** similar shock stress,the spall strength of AlCoCrFeni_(2.1)HEA is about 40%higher than those of other reported dual-phase HEAs due to the high stability of its semi-coherent phase boundaries.

关键词： High-entropy alloy Hugoniot spall damage Microstructure

Multiple ballistic impacts on 2024-T4 aluminum alloy by spheres:Experiments and modelling

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Journal of Materials science & Technology 2021年第35期94卷 164-174页

作者： J.C.Cheng s.P.Zhao D.Fan H.W.Chai s.J.Ye C.Li s.n.luo Y.Cai J.Y.Huang school of Materials science and Engineering Southwest Jiaotong UniversityChengduSichuanP.R.China The Peac Institute of Multiscale sciences ChengduSichuanP.R.China

Multiple ballistic impacts are carried out on a 2024-T4 aluminum alloy by spherical steel projectiles(5-mm diameter)at~400 m s^(-1),to investigate its dynamic deformation and *** ballistic impact process is captured with high-speed *** samples are characterized with optical imaging,three-dimensional laser scanning,microhardness testing and electron backscatter *** increasing number of impacts,crater diameter increases slightly,but crater depth and crater volume increase significantly,and strain accumulation leads to microhardness increase *** parameters all follow power-law relations with the number of ***-like deformation bands and macroscopic deformation twins are produced by impact as a result of spontaneous dislocation self-pinning under high strain rate,large shear *** multiple impacts,shear strain accumulation in the arc-shaped region of the crater induces deformation twinning when it exceeds a critical value(~1.1-1.6).It is highly possible that the deformation twins are related to deformation bands,since they both share one set of the{111}pole with the initial matrix grain.A finite element method model is optimized to reproduce experimental observations and interpret deformation mechanisms.

关键词： 2024Al-T4 alloy Multiple impacts Twin-like deformation band Deformation twinning Finite element method

shock compression and spallation damage of high-entropy alloy Al_(0.1)CoCrFeni

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Journal of Materials science & Technology 2022年第33期128卷 1-9页

作者： n.B.Zhang J.Xu Z.D.Feng Y.F.sun J.Y.Huang X.J.Zhao X.H.Yao s.Chen L.Lu s.n.luo Key Laboratory of Advanced Technologies of Materials Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China The Peac Institute of Multiscale sciences Chengdu 610031China Department of Engineering Mechanics South China University of TechnologyGuangzhou 510641China

shock compression and spallation damage of a face-center cubic phase high-entropy alloy(HEA)Al_(0.1)CoCrFeni were investigated via plate impact experiments along with free surface velocity *** samples were characterized with transmission electron microscopy and electron backscatter *** Hugoniot equation of state and spall strength at different impact strengths were *** exists a power-law relation between spall strength and strain *** spall strength of Al_(0.1)CoCrFeni HEA is about 50%higher than those of previously studied HEAs and comparable to those widely applied structural stainless steels at the same shock *** glide and stacking faults are the important deformation mechanisms in the Al_(0.1)CoCrFeni *** are only observed at high shock *** in the Al_(0.1)CoCrFeni HEA is ductile in *** are nucleated preferentially in grain interiors,and the intragranular voids show a strong dependence on grain boundary misorientation and peak stress.

关键词： Al_(0.1)CoCrFeni High-entropy alloy Hugoniot spall damage Microstructure

Effect of rotationally accelerated shot peening on the microstructure and mechanical behavior of a metastableβtitanium alloy

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Journal of Materials science & Technology 2021年第16期75卷 27-38页

作者： Xinkai Ma Zhuo Chen Dongling Zhong snluo Lei Xiao Wenjie Lu shanglin Zhang Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu 610031China state Key Laboratory of solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China national Key Laboratory of Reactor system Design Technology Nuclear Power Institute of ChinaChengdu 610041China

Microstructural evolution and deformation mechanism of a metastableβalloy(Ti-10 V-2 Fe-3 Al)processed by rotationally accelerated shot peening(RAsP)were systematically investigated with optical microscopy,X-ray diffraction,electron backscatter diffraction and transmission electron *** gradient hierarchical microstructures(gradients inα″martensite andβphase,and hierarchical twins range from the nanoscale to microscale)can be fabricated by RAsP via changing the shot peening *** hardening behavior and tensile mechanical properties of gradient hierarchical microstructure were systematically *** deformation twinning systems of{112}α″and{130}α″in the kinkedα″martensite were revealed during the tensile *** was found that stress-induced martensitic transformation,twinnedα″martensite and the related dynamic grain refinement contribute to hardness and work hardening *** improvement of strength and ductility of the metastableα″titanium alloy can be achieved by introducing a gradient hierarchical microstructure.

关键词： Titanium alloys Gradient hierarchical microstructure α″martensite Rotationally accelerated shot peening Mechanical behavior

Dynamic fracture of carbon nanotube-epoxy composites under high strain-rate loading

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Dynamic fracture of carbon nanotube-epoxy composites under h...

Exploring practical methods for detecting k-nonseparability in multipartite quantum states

第十三届全国物理力学学术会议

作者： B.X.Bie J.H.Han L.Lu X.M.Zhou H.J.Huang Z.Zhang s.n.luo school of science Wuhan University of Technology The Peac Institute of Multiscale sciences national Center for nanoscience and Technology CAs Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of China

We investigate dynamic fracture of three types of multiwalled carbon nanotube(CnT)-epoxy composites and neat epoxy under high strain-rate loading(105-106 s-1).The composites include randomly dispersed,1 wt\%,functionalized and pristine CnT-epoxy composites,as well as laminated,0 wt\%CnT-epoxy *** pristine and functionalized CnT composites demonstrate spall strength and fracture

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science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 255-256页

作者： shunlong luo Academy of Mathematics and systems science Chinese Academy of Sciences

Quantum entanglement, referred to as “spooky action at a distance” by Einstein, is not only an intriguing and fascinating feature of quantum theory challenging our classical intuitions about locality and correlations, but also has practical and profound implications for quantum technologies. Initially described by Einstein, Podolsky and Rosen, as well as by schro¨dinger, entanglement now has become a basic and crucial ingredient for both foundational and experimental investigations of the quantum world.

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Tilting homeostatic and dyshomeostatic microglial balance in health and disease:transforming growth factor-beta1 as a critical protagonist

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neural Regeneration Research 2025年第10期20卷 2895-2897页

作者： nicolas Hugues Yu luo Department of Molecular and Cellular Biosciences University of CincinnatiCincinnatiOHUSA neuroscience Graduate Program University of CincinnatiCincinnatiOHUSA Division of Immunobiology Cincinnati Children’s Hospital Medical CenterUniversity of Cincinnati College of MedicineCincinnatiOHUSA

Adult microglia,by continuously sensing changes in their environment and communicating with nearly all brain cell types,are considered to be the immune sentinels of the *** the healthy central nervous system(Cns),microglia display a unique molecular homeostatic signature(i.e.,Tmem119,P2ry12,sall1,siglech,Gpr34,and Hexb)(Figure 1A).

关键词： Figure signature critical

nucleoside modified mRnA-lipid nanoparticles as a new delivery platform for the repair of the injured spinal cord

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neural Regeneration Research 2025年第8期20卷 2311-2312页

作者： Krisztián Pajer Tamás Bellák Antal nógrádi Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary

spinal cord injury and treatment opportunities:The adult mammalian spinal cord has a very limited capacity for spontaneous regeneration due to various intrinsic molecular and cellular *** the spinal cord neurons have the capacity to regenerate their axons,the expression of growth inhibitory factors,lack or suppression of proper guidance cues,and profound inflammatory responses do not permit successful regeneration(Khyeam et al.,2021).

关键词： injured capacity modified

P2Y1 receptor in Alzheimer’s disease

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neural Regeneration Research 2025年第2期20卷 440-453页

作者： shan luo Yifei Wang Tatsuhiro Hisatsune Department of Integrated Biosciences The University of TokyoKashiwaJapan

Alzheimer’s disease is the most frequent form of dementia characterized by the deposition of amyloid-beta plaques and neurofibrillary tangles consisting of hyperphosphorylated *** amyloid-beta plaques has been a primary direction for developing Alzheimer’s disease treatments in the last ***,existing drugs targeting amyloid-beta plaques have not fully yielded the expected results in the clinic,necessitating the exploration of alternative therapeutic *** evidence unravels that astrocyte morphology and function alter in the brain of Alzheimer’s disease patients,with dysregulated astrocytic purinergic receptors,particularly the P2Y1 receptor,all of which constitute the pathophysiology of Alzheimer’s *** receptors are not only crucial for maintaining normal astrocyte function but are also highly implicated in neuroinflammation in Alzheimer’s *** review delves into recent insights into the association between P2Y1 receptor and Alzheimer’s disease to underscore the potential neuroprotective role of P2Y1 receptor in Alzheimer’s disease by mitigating neuroinflammation,thus offering promising avenues for developing drugs for Alzheimer’s disease and potentially contributing to the development of more effective treatments.

关键词： astrocytes neuroinflammation P2Y1 receptor purinergic receptor