The superplastic m-δ curves can be classified into m_L=m_(max) and m_L=m_(min) types.All of them can be expressed by the following C.L.m-6 equa-tion:δ(%)=〔Cε~((m-m_0))-1〕×100When δ=δ_0=0,m=m_0≠0,C=C_0=k_0/k_0=1.When δ=δ_1(δ_(11),δ_(12),δ-(13),…),m=m_1(m_(

Production of oxygen-enriched air by membrane is a rapidly developingtechnology.There are two primary applications of oxygen-enriched air,firstfor home use by asthmatics and others who have lung diseases.However,the large market for oxygen-enriched air is

A kinetic and thermodynamic analysis of B_2→DO_3 ordering process ina Cu-25.83Zn-3.96Al(wt-%)alloy has been made.It is shown that the shaperecovery rate η,which is directly correlated with the ordering degree S,increases near linearly with the holding tim

The influence of pre-strain in materials state on the shape memory effectin a CuZnAl alloy has been analyzed thermodynamically.The relationshipbetween shape recovery temperature T_s and the pre-strain ε can be deductedas T_s=(Aε~2-Bε+A_s)/(1+Dε),When ε is

The central atoms model(CAM)is used to calculate the driving forceand M_s for martensitic transformation in Pe-C alloys.The thermodynamicconstants needed to use this model are evluated from published activitydata for Fe-C alloys.The results show that when

Based on a great number of experimental measurment results and theore-tic analysis,the formation and distribution rules of K-filled bubbles in K,Si,Al-doped W wire had been investigated.The model for K-filled bubbles for-ming and distributing and formulae

The mechanism of hydrogen cracking in α-Fe has been studied by posi-tron annihilation technique and transmission electron microscope.It wasrevealed that microvoids were promoted by hydrogen-vacancy complex andmicrocracks were intiated by coalescence and g

The microstructure of rapidly quenched Al-Si alloys was studied by opticaland transmission electron microscopy.Exprimental results show that rapidsolidification refines the grain size,makes the structure more homogeneousand completely changes the shape an

The effect of annealing on anti-oxidation of glassy alloys Cu50Zr50,Cu55Zr45 and Cu60Zr40 has been studied by differential scanning calorime-try(DSC)and X-ray diffraction.The alloys were prepared by using meltspinning techique in vacuum.Experimental resul

The relationship between the critical stress,preheat-induced additionalstress in welded joints and the conditions of preheat and postheat is studiedby the PRRC test.A sensitivity coefficient criterion of welding cold crackingof domestic HSLA steel has bee

Using Y_2O_3,BaCO_3 and CuO as starting materials with a ratio of Y:Ba:Cu=1:2:3,an oxide with composition YBa_2Cu_3O_(6.5+x)can be obtained.HereX,with is amount of the oxygen other than that was introduced from rawmaterial,named“acid liberatable oxygen”,i

Some investigation results about montmorillonite used as solid state elec-trolytes conducted by high-valence cations are reported in this paper.Espe-cially,study on conduction of high-valence cations in montmorillonite andapplications in corresponding fie

Carbon content,morphology of carbon and porosity,impurity crystalin construction were measured and observed.The results indicated that thecarbon content had close relations to the properties of polymers.The press-resistance of samples was no propertional

Using Y_2O_3-ZrO_2 and Al_2O_3-ZrO_2 materials,transformation from tetra-gonal to monoclinic phase has been studied and the orientation relationshipbetween both phases has been determined.An antiphase boundary has beenformed at interface in monoclinic pha

Guided by occupancies and iron magnetic moments μ~([3]),~(57)Fe Mssbauerparameters of the sublattices at 250K and in turn for other temperatureswere deduced.Plots of μ(T)in reduced coordinates through the establishedcorrelation between hyperfine field Hn

The CdSe_xTe_(1-x) thin films are obtained by cathodic deposition and ana-lysed by X-ray diffraction.It approved that the films are single phase ter-nary solid solutions on the basis of CdSe,the structure is not strict cubiczinc blende structure,it belong