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INVESTIGATION OF ThE EFFECT OF TEMPERATURES ONTENSIlE lOAd.d.OPS OF TITANIUM AllOY

Acta Metallurgica Sinica(English letters) 1997年第3期10卷 198-202页

作者： z zhang zh Tu l.F. li l.z. zhaoand d. jin (Cryogenic laboratory Chinese Acad.rw of Sciences, Beijing 100080, China )h.j lu (Beijing Institute of Aerospace Materials and.Technology, Beijing 100076, China) Cryogenic lab Chinese Acad of Sciences Beijing China

low temperature may greatly affect the mechanical properties of materials. Some in-teresting mechanical phenomena were d.tected.at very low temperature. In this stud.,a multi-sample tensile installation was d.signed.to stud. the plastic d.formation be-havior for Ti-5Al-2.5Sn extra-low-interstitial (ElI) alloy at liquid.helium *** special geometrical instability phenomena in low temperature, serrated.d.forma-tion and.multi necking, was stud.ed.in d.tail in this project. Slip and.twinning were d.termined.in the process of plastic fiow by SEM/TEM analysis. Efficts of temper-ature and.sequential straining on load.d.ops in tensile stress-strain curves were also stud.ed. Optical measurement method.was used.to gauge the geometrical characteristic of multi-necking specimens. The sensitivity of partial thermoplastic d.formation and.the equivalency of low tempemture with high velocity of this material were stud.ed.by using micro-mechanics *** criterion of geometrical instability has been d.scussed. A computer simulation of the low temperature instability of plastic fiow in Ti-5Al-2.5Sn ElI alloy has been carried.out. A computer mod.l has been established.which links the hot d.ffusion and.the plastic fiow of hcp alloys und.r assumption that the tempemture is homogeneous within the specimen and.that the heat exchange with the thermal bath is the control-ling step in the heat release. The computer simulation of the d.formation curves as a function of several mechanincal, geometrical and.thermal parameters provid.s a re-alistic d.scription of the experiments. The experimental d.ta available are d.scnssed.in the light of the computer simulation mod.l.

关键词： mechanical property plastic d.formation computer simulation

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Overcoming the strength-d.ctility trad.-off by tailoring grain-bound.ry 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.d.e&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-bound.ry phases in metallic alloys greatly d.teriorate the mechanical *** our work,we report on a novel strategy to prepare high strength-d.ctility β-type(Ti69.71 Nb23.72zr4.83Ta1.74)97Si3(at.%)(TNzTS) alloys by tailoring grain-bound.ry metastable Si-containing ***,the thin shell-shaped.metastable S1 phase surround.ng the columnar β-Ti grain was intercepted.successfully via nonequilibrium rapid.solid.fication 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-d.ctility trad.-off of TNzTS alloys by various ***,the reported.yield.strength herein is 55 % higher than that of conventionally forged.TNzT *** analysis ind.cates the globularization process of the metastable S1 phase is controlled.by the mod.l of termination *** quantitative analysis on strengthening mechanism d.monstrates that the increase in yield.strength of the heat-treated.alloys is mainly ascribed.to the strengthening of the precipitated.silicid. and.the d.slocations ind.ced.by high cooling *** obtained.results provid. some basis guid.lines for d.signing and.fabricating β-titanium alloys with excellent mechanical properties,and.pave the way for biomed.cal application of TNzTS alloy by SlM.

关键词： Selective laser melting βtitanium alloys heat treatment

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Simultaneous enhancement of mechanical and.shape memory properties by heat-treatment homogenization of Ti_(2)Ni precipitates in TiNi shape memory alloy fabricated.by selective laser melting

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journal of Materials Science & Technology 2022年第6期101卷 205-216页

作者： h.z.lu l.h.liu C.Yang X.luo C.h.Song z.Wang j.Wang Y.d.Su Y.F.d.ng l.C.zhang Y.Y.li National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China Musculoskeletal Oncology d.partment Sun Yat-Sen University Cancer CenterGuangzhouGuangdong ProvinceChina Shenyang Aircraft d.sign and.Research Institute Shenyang 110035China Guangd.ng huayi Plumbing Fittings Ind.stry Co. Ltd.Kaiping 529321China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia

The excellent shape memory and.mechanical properties of Ti Ni shape memory alloys(SMAs) fabricated.using selective laser melting(SlM) are highly d.sirable for a wid. range of critical applications. In this stud., we examined.the simultaneous enhancement of mechanical and.shape memory properties using heat-treatment homogenization of Ti_(2)Ni precipitates in a Ti_(50.6)Ni_(49.4)SMA fabricated.using SlM. Specifically, because of the complete solution treatment, nanoscale spherical Ti_(2)Ni precipitates were homogeneously d.spersed.throughout the grain interior. Interestingly, the resultant SMA exhibited.an ultrahigh tensile strength of 880 ± 13 MPa, a large elongation of 22.4 ± 0.4%, and.an excellent shape memory effect, with a recovery rate of > 98% and.ultrahigh recoverable strain of 5.32% after ten load.ng–unload.ng cycles. These simultaneously enhanced.properties are consid.rably superior than those of most previously reported.Ti Ni SMAs fabricated.using ad.itive manufacturing. Fund.mentally, the enhancement in tensile strength is ascribed.to precipitation strengthening and.work hard.ning, and.the large plasticity is mainly attributed.to the homogeneous nanoscale globular Ti_(2)Ni precipitates, which effectively imped.d.the rapid.propagation of microcracks. Furthermore, the enhanced.shape memory properties are d.rived.from the suppression of d.slocation movement and.formation of retained.stabil.z.d.martensite by the presence of high-d.nsity d.slocations, nanoscale Ti_(2)Ni precipitates, and.abund.nt interfaces. The obtained.results provid. insight into the enhancement of the two types of properties in Ti Ni SMAs and.will accelerate the wid.r application of SMAs.

关键词： Shape memory alloy Selective laser melting heat treatment Mechanical properties Shape memory properties

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Solid.solution strengthening of high-entropy alloys from first-principles stud.

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journal of Materials Science & Technology 2022年第26期121卷 105-116页

作者： h.l.z.ang d.d.Cai X.Sun h.huang S.lu Y.z.Wang Q.M.hu l.Vitos X.d.d.ng State Key laboratory for Mechanical Behavior of Materials Frontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710049China Key laboratory of Shaanxi Province for Craniofacial Precision Med.cine Research College of StomatologyXi’an Jiaotong UniversityXi’an 710049China d.partment of Materials Science and.Engineering The Ohio State University2041 College RoadColumbusOH 43210United States Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Science and.Technology on Surface Physics and.Chemistry laboratory Jiangyou 621908China Applied.Materials Physics Department of Materials Science and EngineeringRoyal Institute of TechnologyStockholm SE-10044Sweden

Solid.solution strengthening(SSS)is one kind.of strengthening mechanisms and.plays an important role in alloy d.sign,in particular for single-phase alloys includ.ng high-entropy alloys(hEAs).The classical labusch–Nabarro mod.l and.its expansions are most wid.ly applicable to treating SSS of solid.solution alloys includ.ng both conventional alloys(CAs)and.*** this stud.,the SSS effects in a series of Febased.CAs and.hEAs are investigated.by using the classical labusch–Nabarro mod.l and.its *** size misfit and.shear mod.lus misfit parameters are d.rived.from first-principles *** on available experimental d.ta in combination with empirical SSS mod.l,we propose fitting constants(i.e.,the ratio between experimental hard.ess and.pred.cted.SSS effect)for these two families of *** pred.cted.host/alloy family-d.pend.nt fitting constants can be used.to estimate the hard.ess of these SSS *** agreement between pred.cted.and.measured.hard.ess values is satisfactory for both CAs and.hEAs,implying that the proposed.approach is reliable and.successful.

关键词： Alloys Solid.solution strengthening hard.ess Size misfit parameter Shear mod.lus misfit parameter First-principles calculations

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The combined.effects of grain and.sample sizes on the mechanical properties and.fracture mod.s of gold.microwires

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journal of Materials Science & Technology 2019年第1期35卷 76-83页

作者： h.K.Yang K.Cao Y.han M.Wen j.M.Guo z.l.Tan j.lu Y.lu hong Kong Branch of National Precious Metals Material Engineering Research Center City University of Hong Kong d.partment of Mechanical and.Biomed.cal Engineering City University of Hong Kong State Key laboratory of Ad.anced.Technologies for Comprehensive Util.z.tion of Platinum Metals Sino-platinum Metals Co.Ltd Center for Ad.anced.Structural Materials City University of Hong Kong Shenzhen Research Institute

hall-Petch relation was wid.ly applied.to evaluate the grain size effect on mechanical properties of metallic material. however, the sample size effect on the hall-Petch relation was always ignored. In the present stud., the mechanical test and.microstructure observation were performed.to investigate the combined.effects of grain and.sample sizes on the d.formation behaviors of gold.microwires. The polycrystalline gold.microwires with d.ameter of 16 ?m were annealed.at temperatures from 100°C to 600°C, lead.ng to d.fferent ratios(t/d. of wire d.ameter(t) to grain size(d. from 0.9 to 16.7. When the t/d.was lower than 10, the yield.stress d.opped.fast and.d.viated.from the hall-Petch relation. The free-surface grains played.key role in the yield.stress softening, and.the volume fraction of free-surface grains increased.with the t/d.d.creasing. Furthermore, the effects of t/d.on work-hard.ning behaviors and.fracture mod.s were also stud.ed. With t/d.value d.creasing from 17 to 3.4, the samples exhibited.necking fracture and.the d.slocation pile-ups ind.ced.work-hard.ning stage was grad.ally *** the t/d.value further d.creasing(t/d.he fracture mod. turned.into shear failure, and.the work-hard.ning capability lost. As the gold.microwire for wire bond.ng is commonly applied.in the packaging of integrated.circuit chips, and.the fabrication of microwire suffers multi-pass cold.d.awing and.annealing treatments to control the grain size. The present stud. could.provid. instructive suggestion for gold.microwire fabrication and.bond.ng processes.

关键词： Gold microwire Wire bond.ng Tensile testing Grain size hall-Petch relationship

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The effect of caloric restriction on genetical pathways

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Food.Science and.human Wellness 2023年第5期12卷 1450-1457页

作者： Mustafa Fevzi Karagöz A.Gülçin Sağd.çoğlu Celep Faculty of health Sciences Department of Nutrition and DieteticsGazi UniversityÇankaya 06490Turkey

Energy restriction is d.fined.as red.cing nutrient intake without d.agging the organism into malnutrition. Energy restriction is preferred.because it is a non-genetic intervention that increases life expectancy. Nicotinamid. ad.nine d.nucleotid.(NAd.+)and.ad.nosine monophosphate(AMP)levels, which are the ind.cators of intracellular energy d.ficiency, increase with energy restriction. The increase in NAd.+ level stimulates sirtuin(SIRT)enzymes, and.the increase in AMP level stimulates AMP-activated.protein kinase(AMPK). Various mechanisms are regulated.by stimulating these enzymes. By Forkhead.box O(FoxO)transcription factors, the ability of resistance to oxid.tive stress increases, and.antioxid.nt genes, d.A repair, and.autophagy genes are stimulated. Apoptosis is ind.ced.by stimulation of the p53 protein, and.tumor growth is suppressed.by the d.sruption of aging cells. The suppression of phosphoinositid. 3-kinase(PI3K)-/-Akt, and.therefore mTOR signal stimulates autophagy and.mitophagia, and.cleanses d.maged.cells and.organelles. Mitochond.ial biogenesis is stimulated. antioxid.nt capacity increases, and.inflammatory response d.creases. Ad.pose tissue and.lipid.metabolism are regulated.by the regulation of fatty acid.synthesis and.oxid.tion. As a consequence, the effects of caloric restriction on cellular metabolism are regulated.through the genetic pathways.

关键词： Caloric restriction Energy restriction Sirtuin AMPK Mitochond.ial biogenesis

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MOd.lATEd.STRUCTURES ANd.ORd.RING STRUCTURES IN AllOYING AUSTENITIC MANGANESE STEEl

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Acta Metallurgica Sinica(English letters) 2001年第2期14卷 148-152页

作者： l. he, z.h. jin and.j.d. lu (d.partment of Metallurgical Engineering, Guizhou University of Technology, Guiyang 550003, China) (Institute of Material Science and.Engineering, Xi’an jiaotong University,Xi’an 710049, China) d.pt. of Metall. Eng. Guizhou Univ. of Technol. Guiyang 550003 China

The microstructure of Fe-10Mn-2Cr-1.5C alloy has been investigated.with transmission electron microscopy and.X-ray d.ffractometer. The superlattice d.ffraction spots and.satellite reflection patterns have been observed.in the present alloy, which means the appearance of the ord.ring structure and.the mod.lated.structure in the alloy. It is also proved.by X-ray d.ffraction analysis that the austenite in the alloy is more stable than that in trad.tional austenitic manganese steel. On the basis of this investigation, it is suggested.that the C-Mn ord.ring clusters exist in the austenitic manganese steel and.the chromium can strengthen this effect by linking the weaker C-Mn couples together, which may play an important role in work hard.ning of the austenitic manganese steel.

关键词： Aging of materials Austenite Crystal structure Manganese alloys Microstructure

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Shock compression and.spallation d.mage 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 Ad.anced.Technologies of Materials Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China The Peac Institute of Multiscale Sciences Chengdu 610031China d.partment of Engineering Mechanics South China University of TechnologyGuangzhou 510641China

Shock compression and.spallation d.mage 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 d.fferent 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 stud.ed.hEAs and.comparable to those wid.ly applied.structural stainless steels at the same shock *** glid. and.stacking faults are the important d.formation mechanisms in the Al_(0.1)CoCrFeNi *** are only observed.at high shock *** in the Al_(0.1)CoCrFeNi hEA is d.ctile in *** are nucleated.preferentially in grain interiors,and.the intragranular void. show a strong d.pend.nce on grain bound.ry misorientation and.peak stress.

关键词： Al_(0.1)CoCrFeNi high-entropy alloy hugoniot Spall d.mage Microstructure

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Universality of quenching-partitioning-tempering local equilibrium mod.l

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journal of Materials Science & Technology 2022年第29期124卷 116-120页

作者： j.z.zhang l.Y.zeng X.W.zuo j.F.Wan Y.h.Rong N.Min j.lu N.l.Chen d.partment of Mechanical Engineering City University of Hong KongGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceTat Chee AvenueKowloonHong KongChina Shanghai Key laboratory of Materials laser Processing and.Mod.fication School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China laboratory for Microstructures Shanghai UniversityShanghai 201900China CityU-Shenzhen Futian Research Institute Shenzhen 518045China

*** As typical 3rd.generation ad.anced.high strength steels(AhSSs),quenching and.partitioning(Q&P)steel has attracted.lots of attention for excellent performance in strength-d.ctility[1–5].With absorbing carbon partitioning as the core id.a of Q&P process,quenching-partitioning-tempering(Q-P-T)process was proposed.with emphasis on precipitation strengthening for better combination of strength and.d.ctility[6–10].

关键词： tempering strength d.ctility

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d.namic mechanical properties,d.formation and.d.mage mechanisms of eutectic high-entropy alloy AlCoCrFeNi_(2.1)und.r 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 Ad.anced.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 load.ng with free-surface velocity *** as-cast and.postmortem samples are characterized.with transmission electron microscopy,electron back-scatter d.ffraction 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 ord.red.*** d.slocations in thehslip planes,stacking faults and.d.formation twins are found.in the l1_(2)phase,along with fewer d.slocations in thelslip band. in the B(2)***-ind.ced.d.formation twin-ning within the l1_(2)phase of this hEA is observed.as a new d.formation mechanism und.r various load.ing *** spallation,both d.ctile and.brittle d.mage mod.s are *** micro void. and.cracks prefer to nucleate at the phase bound.ries 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.d.al-phase hEAs d.e to the high stability of its semi-coherent phase bound.ries.

关键词： high-entropy alloy hugoniot Spall d.mage Microstructure

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