The wetting precursor film in liquid metal-ceramic system was first found by Snbased active solders in this paper.The results show that the formation of the film depend on thekinds of the active metal in the solder,ceramics,the third element in the solder

A dynamic recrystallization nucleated by subgrain tilt was discovered by investi-gating hot deformation of 8090Al-Li alloy.The nucleation by subgrain tilt and the effect ofstrains on the nucleation were analyzed.It is pointed out by investigations that th

Explosive hardening,rolled hardening and shot peening were practised on thesurface hardening of 1Cr18Ni9Ti steel.After explosive hardening twin paling,dense dislocationlines with definite orientations and martensites were observed in the hardened layer;So

This paper deals with solidification characters of superfine directional columnargrains in cast nickel-base superalloy K405 with rapid directional solidification equipment withsuper-high temperature gradient.Experimetal results show that superfine directi

A continuous Bi-system/Ag superconducting composite tape with dense struc-ture and even coating layer was produced by using current heat melt-painting(CHMP)tech-nique.The superconducting composite tape exhibits excellent flexibility,and no microcrack canb

YBCO bulk material with high J_c value was prepared by using melting texturedgrowth method under no special designed temperature gradient.Structure analysis shows thatthe specimen is composed of large thin plate form grains with their c axis paralls.The s

The characteristics of macro easy axis of a directional solidification specimen inSm-Ce-Co-Cu-Fe-Zr system has been studied.The directional solidification temperature anddropping velocity have remarkable effects on θ,the angle of the easy axis with the di

Variation of the stress σ,internal friction σ~(-1)and ultrasonic attenuation Δα ver-sus cyclic number under push-pull fatigue strain for 99.999wt-% Al polycrystalline specimenswas measured.The dislocation configuration at different stages of fatigue was o

Variations of the stress σ,internal friction Q~(-1)and ultrasonic attenuation Δαwith cycling number N under push-pull fatigue strain for Al-0.025wt-%Mg and 99.6wt-%Alpolycrystalline specimens were measured.Experimenial results indicate that the existance

Two different kinds of internal friction peak located at the high-temperatureside of grain boundary peak(GBP)(denoted as P_1 and P_2 were observed in Al-Sn polycrystals.They are related to the grain boundaries because of their disappearence in Al-Sn singl

Fe_(78)B_(13)Si_9 nanocrystalline alloy was prepared by means of crystallization inamorphous alloy and its microhardness was measured.When grain sizes lie in nanometers,theHall-Petch relationship is still valid.The microhardness of the nanocrystalline FeB

Damage and annealing effect of x,y and z cut LiNbO_3 implanted by 350keVhigh energy Ti(1.5×10~(17)/cm~2)were studied.The damage caused by ion implantation is re-moved by high temperatures annealing in dry oxygen atomsphere at different temperatures andtim

Surface optical properties of x,y,z cut LiNbO_3 single crystal specimen im-planted by 350 keV high energy Ti ions(implantation dose is 1.5x10~(17)/cm~2)were studied inthis paper.Exeperiments about transmission and refractive index of x,y,z cut implantedLi

The nanometer-sized silicon nitride solids(NANO-SNS),heated-treated atdifferent conditions,were systematically studied in terms of X-ray patterns and TEM observa-tions.The basic characterizations of the structure and the bond for NANO-SNS were re-vealed.T

An investigation was made of the effect of Al_2O_3 compound on the formation ofBa_2Ti_9O_(20)phase in the solid state reactions.The formation of Ba_2Ti_9O_(20)crystal,which is diffi-cult in the BaO-TiO_2 binary system because of stress arising along the c

TiO_2 ultrafine particles were prepared from Ti(SO_4)_2 by using collidal chemicalmethod.The most favorable experiment conditions for the preparation of TiO_2 UFP have beenresearched.The spherical amorphous ultrafine TiO_2 product has average diametcrs of

Influence of coupling agents on the interfacial structure between fillers(calciumsilicate and mica)and polypropylene,and consequently effecting the mechanical properties andrheologic behaviour of filled polypropylene were studied.The results show that the

A graft polymer was synthesized through the copolycondensation of a hydroxylterminated poly(methyl phenyl siloxane),PMPS and bisphenol A type epoxy resin,Ep.Themorphology of the polymer was examined by means of SEM.A heterogeneous structure ofPMPS domain

SiC_w and SiC_p reinforced Al-alloy matrix composites were fabricated viavacuum hot pressure technology.This paper describes the research works on effects of workingprocess,reinforcement content,size,type and matrix alloys on the plasticity of above-men-t