The configurations and the motions of grain boundary dislocations(GBD)andthe interations of the GBD with the precipatation particles in the grain boundary(GB)were ob-served with the TEM.It was found that the motions of the GBD along the GB can be hindered

The model of the critical crack size α_c for low-temperature brittleness,estab-lished under the condition of three-point notch-bend,has been extended through the presentstudy to the condition of tension of center-cracked sheet.The expression of α_c has be

A direct observation has been made of dislocation behaviour at crack—tip of anickel—base superalloy single crystal during tensile deformation in a transmission electron mi-croscope.Dislocations are found to emit from the crack-tip during crack propagation

A series of experimental results reveal that the dislocations that emitted fromthe crack tip have a strong interaction with the γ/γ′interface in front of the crack tip.Thelength of the DFZ has been found to increase with the increase in the distance betwe

Response of the interlamellar of Al-Si eutectic growing under constrained condi-tions to the abrupt change of growth rate has been studied both experimentally andtheoretically.The experiments show that the response is retarded and continuous.Mechanismsof

A modified formulation is given in present paper to describe the free energychange during non-equilibrium solidification of pure metals.An expression for the entropychange is established to predict quantitatively the extent of deviation of non-equilibrium

The kinetics of the spread of molten Cu_(50)Ti_(50) alloy on sialon ceramic is investi-gated by sessile drop method,and the interface reaction products is studied by X-raydiffraction.It is found that the wetting radius of the sessile drop on sialon cerami

There exists the deformation and fracture cycle of two types of free-cuttingphase:MnS-RE_2S_3 and(Mn,Ca)S-RE_2S_3 during hot working,as the interface between thephases in them is open,the complex phase may split.

The structures of steel Cr-W-Mn by superplastic thermo-mechanical-treat-ment have been analyzed.It is shown that model of superplastic deformation mechanism of thesteel is in double phase(γ+c)range.The mechanical properties of the steel by superplasticthe

The effects of substrates temperature on the gold atomic cluster,which depos-ited on a NaCl(100)substrate,have been disscussed detailly.With the increase of thesubstrate′s temperature,the size distribution of the cluster was sharpened and the density ofth

Ceramics of Pb(Zn_(1/3)Nb_(2/3))O_3-PbTiO_3-Ba(Ti_(85)Sn_(15))O_3(PZN-PT-BTS)sys-tem are synthesized.The phases and properties are investigated.Because of Sn~(4+)ion,it is difficultto obtain PZN-PT-BTS ceramics with 100% perovskite structure.The propertie

Adding about 3wt-% SiO_2 and inserting graded coating increased adhesivestrength and thermal shock lifetime of plasma sprayed ZrO_2 ceramic coating by four to fivetimes.The improvement of addition on coating and lifetime was attributed to the changes ofco

A tribochemical study is conducted on the grinding process of β-C_2S.The gen-eration and change regularity of crystal lattice distortion and structural defect of β-C_2S duringgrinding process are researched by using PAT and measuring microstress with XRD.

The Si_3N_4 ceramics(91wt-% Si_3N_4+5wt-% Y_2O_3+4wt-% Al_20_3)of room tem-perature strength 620-760 MPa and fracture toughness 7MPa·m~(1/2)were prepared bymicrowave sintering and their phase composition,microstructure and mechanical propertieswere studie

The effect of physical aging on the viscoelasticity and the dimensional stabilityfor polypropylene(PP)was studied by the creep method.A universal creep function was derivedtheorectically by the combination of the kinetics of aging in free state and creep

In this paper,preparation and properties of the fine composites of PT ultrafinepowders with epoxy in the lower PT content were investigated.The composite samples were ob-tained under applied bias electric fields during solidification.XRD,dielectric freque

The fracture toughness K_(1c)and tensile strength σ_b of short carbon fiber(CF)re-inforced polyphenylene sulfide(PPS)and polyarylethersulfone with cardo group(PES-C)com-posites which contain volume fraction of CF in the range from 0 to 40 v.-%,have been m

In this paper fracture characters and toughening mechanisms of Al_2O_3-25 v.-%ZrO_2(2 mol% Y_2O_3)-25 v.-% SiCw(AZS)have been studied by means of XRD,SEM,TEMand three-point-bending techniques.Results have shown that the load-displacement curve ofthe mater