检索结果-南通市图书馆

Mechanical Model on Brittle Crack Initiation and Propagation

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1996年第5期12卷 353-356页

作者： Han, GW feng, d Ye, WJ Luo, HL dept. of Superalloy Central Iron and Steel Research Institute Beijing 100081 China

A mechanical model is presented in this paper to describe the initiating and propagating of brittle cracks. Two criteria have been deduced from the model to determine the effects of such factors as local stress state, surface and grain boundary energies as well as local grain boundary orientation on the initiating and propagating of both intergranular and transgranular brittle cracks. By which the role of adding B in Ni3Al base alloys to improve their ductility temper and hydrogen embrittlements in steels and other alloys as well as the random feature of brittle crack initiation could be explained.

关键词： Crack initiation

Investigation on the Recrystallization Behaviour of Cold deformed MP159 Alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1996年第4期12卷 277-280页

作者： Han, GW feng, d Yin, M Ye, WJ Luo, HL dept. of Superalloys Central Iron and Steel Research Institute Beijing 100081 China

The recrystallization behaviour of cold drawn MP159 alloy was investigated by optical and TEM examinations. It is found that the platelet epsilon phase in the MP alloy inhibits the recrystallization, and this effect makes the MP159 alloy with high recrystallization temperature of about 920 degrees C. This inhibition mainly comes from the increasing of the interfacial energy, which results from the change of the coherent interfaces of (0001)(hcp)//(111)(fcc) into the incoherent interfaces when the recrystallizing grain fronts bypass the platelet epsilon martensite. The increasing of the interfacial energy also causes the dissolution of a few segments on the epsilon martensite platelets, which decreases the strength of the MP alloy.

关键词： Cobalt alloys

The associations between Parkinson’s disease and cancer: the plot thickens

在线全文

学校读者我要写书评

暂无评论

Translational Neurodegeneration 2015年第1期4卷 160-173页

作者： danielle d.feng Waijiao Cai Xiqun Chen MassGeneral Institute for Neurodegenerative disease Department of NeurologyMassachusetts General HospitalHarvard Medical SchoolBostonMAUSA department of Epidemiology Harvard T.H.Chan School of Public HealthBostonMAUSA Key Laboratory of Cellular and Molecular Biology Huashan HospitalFudan UniversityShanghai 200040China

Epidemiological studies support a general inverse association between the risk of cancer development and Parkinson’s disease(Pd).In recent years however,increasing amount of eclectic evidence points to a positive association between Pd and cancers through different temporal analyses and ethnic *** positive association has been supported by several common genetic mutations in SNCA,PARK2,PARK8,ATM,p53,PTEN,and MC1R resulting in cellular changes such as mitochondrial dysfunction,aberrant protein aggregation,and cell cycle ***,we review the epidemiological and biological advances of the past decade in the association between Pd and cancers to offer insight on the recent and sometimes contradictory findings.

关键词： cancer PARK thick

INTERMETALLICS AS SUBSTITUTES FOR SUPERALLOYS

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2005年第4期18卷 463-467页

作者： J. Zhang d. feng Z. Y. Zhong High Temperature Materials division Central Iron and Steel Research Institute Beijing 100081China

The application advances of TiAl, Ti3Al and Ni3Al base aUoys were denumstrated by Central Iron and Steel Research Institute, China. The recent research progresses on improving the reliability of cast TiAI were mainly presented and discussed. The characteristics of the self-oriented lamellar microstructure in cast TiAI were investigated in both as cast and as HlPed states. Based on the mechanical anisotropy of the cast lamellar microstructure, the component specific microstrueture design was proposed for a better performance and reliability of cast TiAl.

关键词： intermetallic application TiAl alloy microstructure design

dRYING OF GRANULAR MATERIALS IN AGITATEd FLUIdIZEd BEd

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2001年第2期13卷 29-31页

作者： Ma, J.H. Liu, H. feng, d.Z. dept. of Air-Condition Eng. Shandong Inst. of Civil Eng. Jinan 250014 China

An experimental study of the drying characteristics of an agitated fluidized bed dryer is presented and discussed. In the study, the citric acid particles were used as bed material with the diameters ranging from 0.2 mm to 1.3 mm. The variables affecting apparently the drying rate were found to be the mass flow rate, the inlet air temperature, the rotary speed of agitating mechanism and the particles feed rate. Comparing with other variables considered, mass flow rate was found to have the least important influence on the drying rate. The agitated fluidized bed dryer is suitable to drying agglomerating or sticky materials.

关键词： dryers (equipment) drying Experiments Mass transfer

On the formation of shear bands in a metallic glass under tailored complex stress fields

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第18期52卷 112-117页

作者： S.H.Chen T.Li W.J.Chang H.d.Yang J.C.Zhang H.H.Tang S.d.feng F.F.Wu Y.C Wu School of Mechanical Engineering Hefei University of TechnologyHefei 230009China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China School of Materials Science and Engineering Liaoning University of TechnologyJinzhou 121001China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China

The formation of shear bands in metallic glasses(MGs)was examined by tailoring localized complex stress fields(LCSFs).The findings have shown that the LCSFs in MGs can increase the localization of strained atoms and accelerate the release of accumulated deformation energy for initiating a shear band in confined and thin-layered *** findings not only add more knowledge to the formation mechanisms of shear bands in MGs,but also provide possible rationale for the discrepancies in the mechanical properties of different-sized *** compared with the bulk samples,the higher strength and larger elastic limits in nanoscaled MGs could be attributed to the elimination of stress-concentrators,which can serve as LCSFs.

关键词： Localized complex stress field Shear band Metallic glass Molecular dynamics simulation Size effect

Matched-Cladding Single-Mode Optical Fiber Optimized at 850 nm Wavelength

在线全文

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 67-69页

作者： Wang Honghai, Tu feng (R&d department of Yangtze Optical Fiber and Cable Co. Ltd., Wuhan, 430072, China R&d department of Yangtze Optical Fiber and Cable Co. Ltd. Wuhan 430072 China

A single-mode optical fiber with quadratic curve index profile in core layer is introduced. The profile is optimized at 850 ran wavelength. The 850 nm bandwidth of this fiber can reach up to 2056.35 ***. This fiber ca... 详细信息

关键词： mode be with of nm Matched-Cladding Single-Mode Optical Fiber Optimized at 850 nm Wavelength

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

在线全文

学校读者我要写书评

暂无评论

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

Shock compression and spallation damage of high-entropy alloy Al_(0.1)CoCrFeNi

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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