Laser hardening can increase the hardness of Cr12 steel up to about1100HV and fine its microstructure.It is mainly due to the improvement of dissolution ofcarbides and homogenity of elements diffusion,by which the composition of austenite,po-sition of Ms

Laser surface modifying of as-cast Ni-based superalloy with Y-alloy pow-der was conducted and mictrostructure,phase composition,element profile of the layerformed have also been examined.The effects of laser processing condition on alloying pro-cess were

NiCoCrAlY cladding has been remelted on the GH140 alloy surface by2kW—CO2 gas laser.The results show that,by controlling proper laser technologicalparameters,structure can be fined,coating compactness and adhesion be obviously en-hanced and the compositio

It is difficult to activate TiFe alloy for hydrogen sorption.In this report amicro-electric-arc oxidation treatment was developed and it was found that TiFe alloycould be activated at the room temperature by such a surface oxidation treatment.It is be-lie

The composition of the corrosion product,black rust,on mild steel coatedwith zinc phosphate/alkyd primer has been determined by XPS technique.The resultsshow that the black rust consists of FeO,Fe,Fe~(3+)and Zn(OH)_2.It is believed that the initi-ation of

The microstructure of GCrl5 steel surface melted by laser has been investi-gated.The strengthening mechanisms of surface melting are discussed.It shows that thestrengthening mechanisms of surface melting are the twinning strengthening of martensite,the de

Effects of Si on the composition and stability of M_6C carbide inFe-16Mo-0.9C alloy and W3Mo2Cr4V high speed steel were investigated.The relation-ship between the stabiltity of(M,Si)_6C and secondary hardness of high speed steels is dis-cussed in detail.I

The phenomena of strain bursts have been studied in an Al-3.36 wt-%Mgsolid solution alloy during cyclic creep at intermediate temperature.The strain bursts of thisalloy occurring only at the certain cyclic stress and test temperature are different form th

A dynamic observation was carried out on uniaxial tensile test ofSn-3.36wt% Bi superplastic alloy at ε=1×10~(-3)min~(-1)and 20℃ by using the S_4-10 SEM.Itwas found that the morphology of grains was obviously chenged;the grains or grain groupswere rotated;

The effect of small amount of boron on CuZnAl shape memory alloy hasbeen systematically studied by electrical resistence method,quantitaive measurement ofmetallurgraph,tensile test and scanning elecrton microscopy.It is found that,by addingsmall amount of

The Fe-Mn alloys display paulli paramagnetism in the temperature rangeof T>T_N.The T_N point increases and the susceptibility decreases with increasing Mn con-tent,because the positive exchange interaction of Fe-Mn atoms is smaller than negative ex-change

Directional columnar crystal specimens of NdFeB alloy have been obtainedby LMC directional solidification technique.The width of columnar crystal is 60—120μm,which decreases with increase of the drawing velocity.It has been found that the columnarcrystal

The effect of Cu on the transformation temperature and latent heat of trans-formation in NiTi shape memory alloys has been studied by means of DSC.It is shown thatthese alloys exhibit excellent shape memory properties.The transformation temperatureand lat

Novel technique of electrochemical etch-stop for high-precision thicknesscontrol of silicon membrane was presented in this paper.The influences of light irradiationand ohm contact of electrode on etch characterization were discussed.Quality of the silicon

The Nd ion distribution in YAG and YAP single crystal fibers has been de-termined with method of X-ray electronic probe.It is shown that Nd ion distribution ishomogeneous along lognitudinal direction but nonhomogeneous among horizontal section,higher in c

A new technology of electroplating graphite powder with metals wasstudied.it has been found that continuous metal coating including Cu,Ni and Co can beavailable on the powder during an intermitten stirring process by the use of a special auxil-iary cathod

The reaction between silane coupling agent/SiO_2 and epoxy resin withoutcuring agents has been studied by means of FT-IR and XPS.Bothr-aminopropyltrimethoxysilane(r-APS)and r-sulfhydrylpropyltrimethoxysilane(r-SPS)on SiO_2 can react with epoxy resin.Howev

The bromization of poly(4-methyl-pentene-1),tactic and atacticpolypropylene was investigated.The substitution proceeds by free-radical mechanizm.Thesubstitution of bromine atoms is on the tertiary carbon of main-chain of the polymersprimally.The solublene

This paper describes the application of an acoustic emission(AE)techniquefor locating the positions of fiber breaks,and thus determing the length distribution of thefiber fragments resulting when a composite specimen containing a single fiber is loaded to

The phase composition,whisker microstructure and whisker-matrix inter-face of hot-pressing SiC-Al_2O_3 composite ceramic were studied by XRD,SEM,TEM andHREM.The results show that the whisker in the composite ceramics is 15R SiC and thematrix is triclinic