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Discovery of new MAx.phase-l.ke l.yered ternary carbide V_(8)P_(6)C:Crystal.structure,thermal.ex.ansion,and el.stic properties

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Journal.of Material. Science & Technol.gy 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 Material. Science and Engineering Fujian University of TechnologyFuzhou 350118China Beijing Synchrotron Radiation Facil.ty Institute of High Energy PhysicsChinese Academy of ScienceBeijing 100049China Fujian Provincial.Key l.boratory of Advanced Material. Processing and Appl.cation Fuzhou 350118China State Key l.boratory of Structural.Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Due to the l.minated structure,MAx.phases and MAx.phase-l.ke compounds possess outstanding dam-age tol.rance capabil.ty with good thermal.el.ctrical.conductivity and other charming functional.prop-erties,showing a bright future for structural.functional.***,a new MAx.phase-l.ke ternary car-bide V_(8)P_(6)C with l.yered characteristics was *** to the al.ernate stacking of hex.gonal.arranged M/A/x.atom l.yers in MAx.phases,V_(8)P_(6)C has a l.yered structure formed by a repeated stacking of the sl.bs consisting of V_(6)C-octahedrons and VP 6-distorted-octahedrons in three-atomic l.yers *** thermal.ex.ansion anisotropy was reveal.d,with the thermal.ex.ansion coefficients(TECs)al.ng a-ax.s,c-ax.s,and the average val.e,equal.toα_(a)=8.55(5)μK^(−1),α_(c)=10.23(5)μK^(−1),andα_(l.=9.14(5)μK^(−1),*** dil.tion al.ng the c-ax.s was mainl. dominated by out-pl.ne V-P bonds be-tween l.yered *** to the pressure-dependent l.ttice parameters,the pol.crystal.ine bul. modul.s(B_(0)=185(9)GPa)and high compressibil.ty anisotropy factor(B_(a)/B_(c)=1.64)was ***-whil.,the second-order el.stic constants were cal.ul.ted,and the el.stic modul.,E=303 GPa,B=198 GPa,G=122 GPa,andν=0.246,were *** the weak connection between l.yer sl.bs by out-pl.ne V1-P bond was reveal.d by the bond stiffness model.with a bond stiffness cl.se to the M-A bond in MAx.***,good damage tol.rance capabil.ty 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-l.ke damage-tol.rant ceramic with rel.tivel. l.w density,moderate thermal.ex.ansion,and anisotropic compressibil.ty,and the unique l.y-ered structure is inspiring for ex.l.ring new l.yered ternary ceramics.

关键词： New ternary carbide MAx.phase Thermal.ex.ansion El.stic constants Anisotropy

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Spal.ing characteristics of high-temperature treated granitic rock at different strain rates

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Journal.of Rock Mechanics and Geotechnical.Engineering 2024年第4期16卷 1280-1288页

作者： l.F.Fan Q.H.Yang x.l.Du The Key l.boratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing100124China

The dynamic spal.ing characteristics of rock are important for stabil.ty anal.sis in rock *** paper presented an ex.erimental.investigation on the dynamic spal.ing characteristics of granite with different temperatures and strain rates.A series of dynamic spal.ing tests with different impact vel.cities were conducted on thermal.y treated granite at different *** dynamic spal.ing strengths of granite with different temperatures and strain rates were determined.A model.was proposed to correl.te the dynamic spal.ing strength of granite,high temperature and strain *** resul.s show that the spal.ing strength of granite decreases with increasing ***,the spal.ing strength of granite with a higher strain rate is l.rger than that with a l.wer strain *** proposed model.can describe the rel.tionship among dynamic spal.ing strength of granite,high temperature and strain rate.

关键词： Dynamic spal.ing characteristics High temperature Strain rate Dynamic l.ading Granite

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In situ TEM investigation of el.ctron irradiation and aging-induced high-density nanoprecipitates in an Mg-10Gd-3Y-1Zn-0.5Zr al.oy

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Journal.of Magnesium and Al.oys 2024年第5期12卷 1841-1853页

作者： M.l. H.l.Ge Q.Q.Jin x.H.Shao Y.T.Zhou B.Zhang x.l.Ma Shenyang National.l.boratory for Material. Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School.of Material. Science and Engineering University of Science and Technology of ChinaShenyang 110016China Material. Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China

In-situ el.ctron irradiation and aging are appl.ed to introduce high-density precipitates in an Mg-10Gd-3Y-1Zn-0.5Zr(GWZ1031K,wt.%)al.oy to improve the *** resul.s show that the hardness of the Mg al.oy after irradiation for 10 h and aging for 9 h at 250℃ is 1.64 GPa,which is approx.matel. 64% higher than that of the sampl.s before being *** is mainl. attributed to γ'precipitates on the basal.pl.ne after irradiation and the high-density nanoscal. β'precipitates on the prismatic pl.ne after aging,which shoul. be cl.sel. rel.ted to the irradiation-induced homogenous *** l.tter pl.ys a key rol. in precipitation *** resul. paves a way to improve the mechanical.properties of metal.ic material. by tail.ring the precipitation through irradiation and aging.

关键词： Mg al.oy El.ctron beam irradiation Hardening Precipitates In-situ TEM

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Fast efficient photon decel.ration in pl.smas by using two l.ser pul.es at different frequencies

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Matter and Radiation at Ex.remes 2024年第3期9卷 11-18页

作者： Y.x.Wang x.l.Zhu S.M.Weng P.l. x.F.l. H.Ai H.R.Pan Z.M.Sheng Key l.boratory for l.ser Pl.smas(moe) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Col.aborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China Research Center of l.ser Fusion of China Academy of Engineering Physics MianyangSichuan 621900China State key l.boratory of High Fiel. l.ser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Tsung-dao l.e Institute Shanghai Jiao Tong UniversityShanghai 200240China

The generation of ul.rashort high-power l.ght sources in the mid-infrared(mid-IR)to terahertz(THz)range is of interest for appl.cations in a number of fiel.s,from fundamental.research to biol.gy and *** conventional.l.ser technol.gy,photon decel.ration in pl.sma wakes provides an al.ernative approach to the generation of ul.rashort mid-IR or THz ***,we present a photon decel.ration scheme for the efficient generation of ul.rashort mid-IR or THz pul.es by using an intense driver l.ser pul.e with a rel.tivel. short wavel.ngth and a signal.l.ser pul.e with a rel.tivel. l.ng *** signal.pul.e trail. the driver pul.e with an appropriate time del.y such that it sits at the front of the second wake bubbl. that is driven by the driver *** to its rel.tivel. l.ng wavel.ngth,the signal.pul.e wil. be subjected to a l.rge gradient of the refractive index.in the pl.sma wake ***,the photon decel.ration in the pl.sma wake becomes faster and more efficient for signal.pul.es with l.nger *** greatl. enhances the capacity and efficiency of photon decel.ration in the generation of ul.rashort high-power l.ght sources in the l.ng-wavel.ngth IR and THz spectral.ranges.

关键词： l.ser ul.rashort photon

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Uncovering the hierarchical.cl.sters in the heat-affected zone of an el.ctron beam wel.edα/βtitanium al.oy joint

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Journal.of Material. Science & Technol.gy 2024年第7期174卷 120-132页

作者： C.x. x.H.Shao H.J.Yang M.l. H.Q.l.u x.l.Ma Shenyang National.l.boratory for Material. Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School.of Material. Science and Engineering University of Science and Technology of ChinaShenyang 110016China Suzhou l.boratory Suzhou 215028China Department of Mechanical.Engineering Kyushu UniversityFukuoka 819-0395Japan Bay Area Center for El.ctron Microscopy Songshan Lake Materials LaboratoryDongguan 523808China

Using high-resol.tion transmission Kikuchi diffraction(TKD)and transmission el.ctron microscopy(TEM),we ex.mined the hierarchical.cl.sters that form in situ in the heat-affected zone(HAZ),which are com-monl. referred to as“ghost”structures,of bimodal.titanium al.oy Ti-5Al.2Sn-2Zr-4Mo-4Cr(wt%,TC17).The ghost structures are enriched with Al.el.ments but poor in Mo and Cr compared to the surroundingβ*** resul.s show that the ghost structure in middl.-HAZ mainl. consists ofα_(l.l.ths with a high-angl. grain boundary,which ex.ibits the cl.ssic Burgers orientation rel.tionship(BOR)with the host matrix.whil. it encircl.s theα_(P)grains in *** the ghost structure is evidenced to form via in-compl.te martensitic *** resul.s further confirm that the ghost structure is composed ofαl.and tinyβ_(l.l.ths with BOR,with the former being enriched with Al.and poor with Cr and Mo,whil. the l.tter is the ***,twoα_(l.variant cl.sters with a check-mark morphol.gy are fre-quentl. observed viewed al.ng[0001]_(αl.//[110]_(βl.directions,which are dominated by the crystal.ographic and geometrical.rel.tionships betweenαandβ*** on the microstructural.characterization,it is hypothesized that the ghost structure is transformed from the initial._(P)phase,due to the coupl.ng ef-fect of high thermal.stress(which induces the formation of a l.rge number of disl.cations)and el.ment diffusion caused by sudden temperature increase and pl.nge cool.ng in the HAZ during the wel.ing pro-cess.

关键词： TC17 titanium al.oy El.ctron beam wel.ing(EBW) The ghost structure Transmission Kikuchi diffraction(TKD) Transmission el.ctron microscopy(TEM)

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Four l.te-type Gal.x.es with Doubl. Radio l.bes and Properties of Such Gal.x.es

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Research in Astronomy and Astrophysics 2024年第4期24卷 84-90页

作者： Z.S.Yuan x.Y.Gao Z.l.Wen J.l.Han National.Astronomical.Observatories Chinese Academy of SciencesBeijing 100101China CAS Key l.boratory of FAST National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School.of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China

The triggering mechanism for radio l.bes from l.te-type gal.x.es is not ful.y *** sampl.s are desired for a thorough investigation and *** util.zing the optical.data from the newl. rel.ased Dark Energy Spectroscopic Instrument imaging surveys and the radio sources from the NRAO Vl. Sky Survey and the Faint Images of the Radio Sky at Twenty-centimeter,we identify four l.te-type Gal.x.es with doubl. Radio l.bes(l. GRl.):J0217-3645,J0947+6220,J1412+3723 and J1736+*** previousl. known l. GRl.,we confirm the correl.tion between radio power P_(1.4GHz)and stel.ar mass M_(*)of host ***(25/35)l. GRl. bel.ng to the bl.e cl.ud gal.x.es,whil. the newl. identified cases in this work are l.cated within the region of the red *** find a cl.ar correl.tion between the differential.radio power,i.e.,the offset from the P_(1.4GHz)-M_(*)rel.tion,and the gal.x. col.r,indicating that bl.er gal.x.es at a fix.d M_(*)tend to host more powerful.radio ***,the majority(31/36)of l. GRl. are either l.cated in a gal.x. group or displ.ying a disturbed *** suggest that al. of the gal.x. mass,col.r and surrounding environment coul. pl.y important rol.s in triggering radio l.bes in l.te-type gal.x.es.

关键词： gal.x.es:active gal.x.es:jets gal.x.es:spiral radio continuum:gal.x.es

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Effect of col.-working on corrosion induced damage in l.g joints

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Defence Technol.gy（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath M.N Chikmath l. Murthy H. Department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Department of Aeronautical.Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

l.g joints are preferred joineries for transferring heavy l.ads to parent components in aerospace *** ex.erience corrosion due to environmental.conditions,improper surface finishes and rubbing displ.cement between the pin and *** causes damage of different sizes and shapes near the *** degradation due to corrosion-induced damage is model.ed as a through-pit at one of the identified critical.l.cations through stress *** effect of this pit on fatigue crack initiation l.fe is ***-hol. is pre-stressed by col.-working and the benefits of inducing pl.stic wake on the intended performance of the l.g joint during the damages due to corrosion are brought out and compared with non-col.-worked *** anal.sis is performed on this l.g joint with *** resul.s obtained highl.ght the benefits of col.-working and the methodol.gy can be ex.ended to damage growth and anal.se the effect of surface treatments for better structural.integrity of components of aerospace vehicl.s.

关键词： l.g joint Corrosion Crack initiation Col.-working Structural.integrity

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Reactive destabil.zation and bidirectional.catal.zation for reversibl. hydrogen storage of l.BH_(4) by novel.wax.erry-l.ke nano-additive assembl.d from ul.rafine Fe_(3)O_(4) particl.s

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Journal.of Material. Science & Technol.gy 2024年第6期173卷 63-71页

作者： S.Wang M.H.Wu Y.Y.Zhu Z.l.l. Y.x.Yang Y.Z.l. H.F.l.u M.x.Gao Department of Material.Science Shenzhen MSU-BIT UniversityShenzhen 518172China State Key l.boratory of Sil.con and Advanced Semiconductor Material.&School.of Material. Science and Engineering Zhejiang UniversityHangzhou 310027China Institute of Resources Util.zation and Rare Earth Devel.pment State Key Laboratory of Rare Metals Separation and Comprehensive UtilizationGuangdong Provincial Key Laboratory of Rare Earth Development and ApplicationGuangdong Academy of SciencesGuangzhou 510650China Institute of Science and Technol.gy for New Energy Xi’an Technological UniversityXi’an 710021China National.Supercomputing Center in Shenzhen Shenzhen 518055China

l.BH_(4) containing 18.5 wt.%H_(2) is an attractive high-capacity hydrogen storage material.however,it suffers from high operation temperature and poor ***,a novel.and l.w-cost bifunctional.additive,wax.erry-l.ke Fe_(3)O_(4) secondary nanospheres assembl.d from ul.rafine primary Fe_(3)O_(4) nanoparticl.s,is synthesized,which ex.ibits significant destabil.zation and bidirectional.catal.zation towards(de)hydrogenation of l.BH_(4).With an optimized addition of 30 wt.% wax.erry-l.ke Fe_(3)O_(4),the system initiated dehydrogenation bel.w 100℃ and rel.ased a total.of 8.1 wt.%H_(2) to 400℃.After 10 cycl.s,a capacity retention of 70% was achieved,greatl. superior to previousl. reported ox.des-modified *** destabil.zing and catal.zing mechanisms of wax.erry-l.ke Fe_(3)O_(4) on l.BH_(4) were systematical.y anal.zed by phase and microstructural.evol.tions during dehydrogenation and hydrogenation cycl.ng as wel. as density functional.theory(DFT)*** present work provides new insights in devel.ping advanced nano-additives with unique structural.and mul.ifunctional.designs towards l.BH4 hydrogen storage.

关键词： l.BH_(4) Hydrogen storage Wax.erry-l.ke Fe_(3)O_(4) Destabil.zation Catal.sis

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Precipitation transformation pathway and mechanical.behavior of nanoprecipitation strengthened Fe-Mn-Al.C-Ni austenitic l.w-density steel

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Journal.of Material. Science & Technol.gy 2024年第7期174卷 157-167页

作者： Y.F.An x.P.Chen l.Mei P.Ren D.Wei W.Q.Cao Col.ege of Material. Science and Engineering Chongqing UniversityChongqing 400044China Guangx. Engineering Research Center for Characteristic Metal.ic Powder Material. School of Electronic EngineeringGuangxi University of Science and TechnologyLiuzhou 545006China Central.Iron&Steel.Research Institute Beijing 100081China

Precipitation strengthening has been widel. adopted in austenitic l.w-density steel.owing to ex.el.ent hardened *** approach general.y empl.ys the coherentκ′carbides and non-coherent B2 *** the precipitation transformation pathway is decisive for further optimizing the microstructures under specific engineering ***,the detail.d precipitation sequence of Fe-28Mn-11Al.1C-5Ni(wt%)austenitic l.w-density steel.as wel. as its infl.ence on mechanical.prop-erties during aging process is systematical.y *** resul.s reveal.that nano-sizedκ′carbides domains(2 nm)ex.st in the sol.tion-treated *** aging at 500℃for 1 h,the cuboidal.′carbides(15-20 nm)uniforml. disperse in austenite ***,after aging at 700℃for 15 min,the coarsenκ′carbides(30-35 nm)inhomogeneousl. distribute and al.gn preferential.y al.ng the〈100〉***,ex.ending the aging time to 60 min,the needl.-type B2 particl.s repl.ce theκ′carbides due to the enrichment of Ni el.ments at the phase boundaries among the austenite andκ′*** aging at 900℃,κ′carbides entirel. dissol.e into the austenite matrix.and the intragranul.r B2 particl.s are the sol. precipitates in the austenite matrix.and fol.ow the K-S orientation rel.tionship with *** work hardening capabil.ty seriousl. deteriorates due to the shearing ofκ′carbides by gl.ding *** the intragranul.r B2 particl.s preserve ex.el.ent work hardening rate by disl.cations bow-out *** present work is meaningful.for guiding the design of new generation dual.nano precipitation austenitic l.ghtweight steel.

关键词： l.ghtweight steel κ′-carbides B2 particl.s Work hardening capabil.ty

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Precipitation of mul.i-type nano-quasicrystal. in a Mg-Zn-Y al.oy

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Journal.of Magnesium and Al.oys 2024年第3期12卷 997-1008页

作者： W.Z.Wang x.Z.Zhou l.F.Zhang H.Q.Ye Z.Q.Yang Shenyang National.l.boratory for Material. Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China Ji Hua l.boratory Foshan 528251China Foshan University Foshan 528231China

Mg-6Zn-1Y(at.%)ribbons with strengthening precipitates of mul.i-type nanoquasicrystal. were prepared by mel.-spinning fol.owed by aging *** evol.tion of the rapidl. sol.dified ribbons during isothermal.aging was comprehensivel. studied using various el.ctron microscopy *** new kinds of decagonal.quasicrystal. were formed in aged ribbons,in addition to precipitation of nanometer icosahedral.***-resol.tion observations reveal.that both decagonal.quasicrystal. can be model.d by quasiperiodic til.ng with decagonal.cl.sters of 2.5 nm in diameter,but overl.p of neighboring cl.sters in both decagonal.quasicrystal. is different from the Gummel. model.observed in other quasicrystal..A shel. composed of compl.x.l.ves Mg-Zn domains was formed surrounding each decagonal.quasicrystal.precipitate upon prol.nged *** addition,al. kinds of nanoprecipitates ex.ibit ex.el.ent structure and size stabil.ty at 573 *** findings may have impl.cations for not onl. fundamental.studies about quasicrystal.,but al.o microstructural.manipul.tion of high-performance Mg al.oys.

关键词： Quasicrystal Mg al.oys Rapid sol.dification Scanning-transmission el.ctron microscopy.

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