The variations of friction coefficient vs temperature of Ni-Cu-Re,Ni-Re,Ni-Cu,Cu-Reand pure Ni were determined by pin on disc wear device.The structures of oxide film,wear debris and vol-atile substance were identified by X-ray diffraction;the composition

The mechanical properties and microstructures of a 2091 Al-Li alloy sheet areinvestigated extensively by tension testing,scanning and transmission electron microscopy in va-rious ageing temperatures.The paper has discussed the effect of solid solution tem

Dislocation distribution ahead of a cleavage crack tip in Zn single crystal isobserved by using etch pit technique.The results show that this distribution has the featurepredicated by the DFZ models,and both X_1,the distance from the crack tip to the firs

Based on the tests of tensile-holding under creep and fatigue complex load-ing,the results show that the creep-fatigue interaction takes place.Tensile-hiding acceler-ates the rate of crack propagation(da/dN)and reduces the fatigue life(N_f)greatly.GH33Aal

A study has been made of the microstrctures of adiabatic shear band in alow carbon steel,resulting from high speed torsional testing with about 1500 s~(-1)of the aver-age strain rate.Several fine shear bands have been found to distribute over the deformat

18-8 austenite stainless steel was nitrogenized in a mixture of hydrogen andnitrogen gases plasmagenerated by RF with the power of 130W;Mixture gases ratio was1:4 at total pressures of 133Pa and 266Pa.After nitrogenizing for 7.2ks at temperatures of923,82

The variation of fatigue dislocation structures in quench-400℃ tempered 12CrMo steel with incresing cyclic loading numbers have been investigated by using transmis-sion electron microscopy.The dislocation structure styles showing cyclic micro-hardeningand

The composition and morphology of inclusion in free-cutting plastic die steel 5CrNiMnMoVSCa have been studied.There are three types of sulfide:Linear MnS,oval(Mn·Ca)S solid dolutionwithout and with oxide nucleus.As Ca/S increases,the portion of the two la

The m-δ curves determined for the Zn-5%Al alloy with T=250℃ and ε=0.025/minwere all of the type.When the w_0/l_0 ratio was increased from 0.15 to 0.39,the m_0,m_L,and δ_F values were increased,while the δ_L and m_F values did not change very clearly.When

The spectral absorbance of some D/M unsymmetrical optical systems,which consists of a dielectric layer ″D″(D=SiO,SnO_2,CeO_2,ZnS or CdS) and a metalliclayer ″M″ (M=Al or Ag),was studied in the wavelength range of 320—1000nm.The re-suits demonstrate that t

Complex organic solid electrolyte based on montmorilionite was preparedby inorganic cation(Mg~(2+))exchange first and then displacing the layer water ofmontmorillonite with organic compound such as γ-butyrolactone.The solid electrolyteγ-BL-Mg montmorillon

ABSTRACT The study of the coal slag attack on several Al_2O_3—Cr_2O_3refractories bymeans of cup slag test was conducted.The fused(or sintered),rebonded chrome-aluminarefractories had the open pore structure and uniform textural appearance that were easil

Interpenetrating polymer networks(IPNs)based on polyepichlorohydringlycol(PECH),Toluene diiocyanate(TDI)and trihydroxymethy propane(TMP)as net-work Ⅰ and methyl methyacrylate(MMA)-ethyleneglycol dimethacrylate(EGLM)as net-work Ⅱ were synthesized by using

ABSTRACT A series of high molecular weight homopolymers of alkyl acrylates and alkylmethacrylates were prepared.The solubility,flow behavior,drag reduction effectiveness andresistance to degradation at different flow rates in relation to composition,molec

Polymethylvinylsiloxane(PDMVS)-Polyethylene(PE)alloy membraneshave been prepared with mixing mechanically or in solution and with crosslinking by γ-rayirradiation.The surface structure has been studied by means of XPS,SEM and contact an-gle measurement.Fr

The failure phenomena of viscoelastic materials consist of three factors:1)the time dependences of the bulk stress-strain relation;2)the time dependences of the fail-ure initation mechanism-the formation of overstressed polymer chains in local plastic are