The carbonyl iron ultrafine powders(UFCIP)of the size ranging from 5 to30nm and the laser-made SiCB ultrafine powders of the size ranging from 30 to 80nmwere characterized by CTEM,EELS,HREM and microdiffraction.It was found that thecarbonyl iron ultrafine

The microstructures produced in a normalized 55SiMnMo steel consisted ofcarbide-free upper and lower bainite,martensite and retained austenite.Both the upperand lower bainite contained midribs,subunits and dislocations;the martensite was twinned;and the r

After loading a distocation-free zone(DFZ)was found in model Ⅰprecracked bulk Al single crystals.It was shown by analysis that DFZ has its own threedimensional characteristics,this conclusion was verified directly by a Pseudo Kossel meth-od.A new formatio

The effects of the addition of misch metal on the hot plasticity andmicrostructure of an Al-Mg-Si alloy(6063)have been investigated by using the hottorsional test,SEM and TEM.The results show that the hot plasticity of the 6063 alumi-num alloy is obviousl

An investigation of the fracture path of pearlite,dislocation arragement andinterface structure of the two phases in an eutectoid pearlitic steel have been carried out bymeans of TEM and SEM.Both in proeutectoid ferrite and in the ferrite of the pearlite,

Short cabon fiber-copper composite were made by means of powder me-tallurgy.The fibers in composite were homgeneously distributed in the matrix and orientedrandomly.The tensile strength of the composite increases as the volume of fiber from 0 to2%,but dec

Ni-32.5%Sn eutectic alloy has been undercooled by up to 302K(0.215T_E)throughdenucleating with a special boron-silicate glass 70% Na_2SiO_3+17.7% Na_2B_4O_7+12.3%B_2O_3.Its rapidsolidification behaviour during recalescence was studied by means of high spe

M_2C carbide and its decomposition products have been studied by SEM.Inthe cast state,the morphology of M_2C on the grain boundies is like″fan″,″lameller″or″stranger″.M_2C carbide is metastable at high temperature and will normally decompose toMC and M_6C

The effect of hydrogen on the diffusion of Al and V in pure titanium wereinvestigated by diffusion couple experiments.It was shown that hydrogen can enhance thediffusivities of both Al and V.An order of increasing the diffusivity of Al has beenobtained.Th

Fractal dimension of different parts of a fracture surface formed by slowcrack propagation induced by the combining effect of hydrogen and static bending momentwere determined by using the method of fracture profile analysis.The results show that thefract

The vertical section method is employed to measure fractal dimensions ofcross section profile of fractured surfaces under plane strain conditions.It is shown that thevertical section method could describe further the roughness of fractured surfaces as com

The morphology and microstructure of YBaCuO superconducting thinfilms deposited on sapphire,ZrO_2 and SrTiO_3 single crystal by RF magnetron reactivesputtering were studied by SEM and TEM.The relationship between the microstructureand the superconductivit

The effects of Ge content(0—8.7at-%)on the Neel transition of γ-Fe-Mn alloys havebeen investigated by magnetic susceptibility(χ)measurement and M(?)ssbauer spectrum anlysis.With in-creasing Ge content,the magnetic susceptibility increases and the Neel tem

Stress-controlled tension-tension fatigue tests(R=0.1,σ_u=275,325,375MPa)were per-formed on 914C/TS-5 graphite/epoxy laminates of(O_2, Φ_2)_s stacking order.Some of layers in thelaminates were cut in order to create a favourable condition for mode Ⅱ fract

An experimental study has been made on the apparent transfer phenomena for Ti and Si inmolten Cu-Ti-Si alloys contacted with TiO_2 and SiO_2 by a constant P_(H_2O)/P_(H_2)at 1500℃.Linear rela-tions between apparent mass-transfer coefficients k′_(Ti) and k

Vacuum evaporating device which was designed by us is used to grow dia-mond films on the substrate of silicon single crystals from a mixture of CH_4 and H_2 gasesat lower pressure by hot-filament CVD method.The results of X-ray diffraction,Ramanspectrum a

The surface,the interface and the microstructures of the undoped hydrogenated amorphoussilicon films by RF plasma chemical vapor deposition are investigated.The whisker-like microstructures(amorphous silicon whisker)are observed by transmission electron m

The structure and properties of photocrosslinked polyethylene inLDPE-BP-TAIC system were studied.The results of X-ray diffraction and DSCmeasurement show that the effect of crosslinking of the crystallinity was very limited,butthe crosslinks can affect th

″Raspberrylike″and″Void″composite polymer paritcle were prepared by seeding emulsionpolymerization.The formative reasons of the morphology are inferred.It is considered that the hydrophilicdifference is primary factor to control the morphology.