Ti-1023 is a typical near-β titanium alloy, which has attracted extensive attention for such particular advantages as good damage tolerance and deeper hardenability as compared with its congeners. In present article, individual and collective effects of primary and secondary  phase on tensile property and fracture toughness were systematically investigated on Ti-1023 titanium alloy. It was found that the volume fraction of primary  phase (p) plays the main role in influencing the tensile properties by way of altering the concentration of solute atoms in metastable β phase, while the p morphology plays the minor role. Pronounced effect of secondary  phase (s) on tensile properties was observed, depending on the amount, morphology and size of s. And the strengthening effect secondary  phase is weakened with increasing of the volume fraction of p. Limited effect of p on fracture toughness of Ti-1023 alloy was found and better balance between fracture toughness and strength can be achieved by way of lowering volume fraction of p and increasing amount and size of s particles.

The solidification microstructure of Cu-20%Pb hypomonotectic alloy was investigated by means of combination of melted glass denucleation and cyclical superheating. The variation of thermomechanical parameters related to solidification of undercooled Cu-20%Pb hypomonotectic alloy was calculated based on the BCT-LKT dendritic growth model, thus the solidification mechanism of the alloy was discussed. The experimental results shows that the microstructure of Cu-20%Pb hypomonotectic alloy combines α(Cu) dendrites with Pb phases distributed between them at little undercooling solidification. Dendrites get refined and uniformed as undercooling increases. It can be concluded that the reason of dendrite refinement at different undercooling is not same. The melt can be heated above the solidus temperature due to release of latent heat during rapid solidification of the undercooled melt, thus part of solidified dendrites can be melted and refined when the undercooling is smaller than 200K. When undercooling is high, the contraction of different parts of dentrites and flow velocity of the melt are so high that the dendrites are impacted and become fragmented. Thus when undercooling is above 200K, dentrites will be refined by dendrite remelting and dendrite fragmentation together.

A CuSiN self-aligned layer with 4nm thickness was synthesized using RF-plasma-enhanced chemical vapor deposition system. The microstructure of Si/SiO2/TaN/Ta/Cu(CuSiN)/SiC:H/SiOC:H multi-layer stacks were investigated by using high-resolution transmission electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction . The result indicates that the thermal stability of the interface of Cu/SiC:H dielectric barriers can be improved by introducing CuSiN self-aligned layer. This is attributed to its suppress copper or vacancy diffusion along the interface and into SiC:H/SiOC:H dielectric film.

Fully epitaxial Fe/MgO/Fe(001) magnetic tunneling junctions (MTJs) were fabricated on GaAs(001)-4亊6 surface. The in-situ longitudinal magneto-optical Kerr effect (MOKE) measurements showed a typical two steps MOKE loop when the magnetic field applied along [1-10] direction. It was found that the coercivity of bottom Fe electrode (200 Oe) is about 20 times higher than that of top Fe layer. A remarkably increase of the coercivity in the bottom Fe layer was attributed to the pinning effect at MgO/Fe/GaAs(001) interfaces. Spin-resolved valence band photoemission spectroscopy measurements showed that upon MgO overlayer the spin polarization at Fermi level of bcc Fe(001) reverses the sign from negative into positive. The sign reversion of the spin polarization is ascribed to a selective modification of the electronic states mainly in minority ∆5伀 symmetry involved at the MgO/Fe(001) interface.

Effects of Sr addition on dendrite growth and phase precipitation of AZ91D alloy was studied. The experimental results showed that addition of 0.01-0.1wt%Sr to AZ91D alloy decreased the grain size obviously and promoted formation of globular grains. With the increase of Sr content the morphology of β-Mg17A112 phase in the alloy was changed and the amount of the phase increased. Meanwhile, the needle-like or pole-like Al4Sr phase adhering to the β-Mg17A112 phase at grain boundaries was observed. The enrichment of Sr element at solidification interface front, especially at the tip of α-Mg dendrite, restricts the growth of α-Mg dendrite and changes the preferential growth of α-Mg, which results in the grain refinement and modification of α-Mg dendrite.

Based on the planar assumption, the solute boundary layer in lamellar eutectic growth in steady-state is estimated by means of modifying the conservation of mass at solid/liquid interface. It is found that the solute boundary layer along the growth direction is related to that along the solid/liquid interface. For transparent organic system CBr4-C2Cl6 of eutectic composition, the difference in average composition of the solids and that of the liquid at solid/liquid interface increases with increasing in growth velocities. The average composition in the liquid at solid/liquid interface still closes to the eutectic one as the initial composition of the alloy is apart from the eutectic point. In addition, for a fixed growth rate, the variation of ratio of the difference in average composition to the lamellar widths of the two solid phases with initial composition of the alloy is noticeably distinct.

In order to study the effect of magnesium alloy on the animals, the AZ31B magnesium alloys with different dimensions were implantated in the New-Zealand rabbits, with a titanium alloy（Ti-6Al-4V) as a control. It was found from the experiments that the osteotylus was found surround the magnesium alloy after 2 weeks implantation, and it turned into ripe bone tissue at 8 weeks. The implantation of the magnesium alloy did not influence the recirculating, immune and urinary systems of the rabbit. The magnesium calcium apatite, which was the main degradation product of the magnesium alloy, could be metabolismed by the kidney. The magnesium ions concentration in blood was in the range of normal values. It can be concluded that it is safe for the rabbit in the early stage of the magnesium alloy implantation, and the implant can be beneficial to the new bone formation.

A mathematical model for feeding strip steel process has been developed using energy conservation principle on traveling thin-cell and introduction of relative steel strip feeding speed. Model equations are solved by using the finite volume method, and computer code is made out by Visual basic language. The numerical simulation is carried out on a typical feeding steel strip in continuous casting mold. The temperature distribution of continuous casting strand and solidification state curve of feeding strip steel are obtained. Conventional temperature field and solidification behavior from surface to interior of strand are changed by a feeding strip steel process. Strip steel in mold firstly solidifies and then melts again, the superheat of molten steel and temperature gradient of strand decrease. These are beneficial for formation of equiaxed dendrite in strand. At the some time, some parametric studies such as size of feeding strip steel, casting speed and superheat are also conducted, a theoretical base is built for the industrialization of the feeding strip steel in mold.

A mathematical model was developed to study fluid flow and inclusion collision and growth in the slab continuous caster. Due to the interaction of the moving solidifying shell and the upward flow, a small corner-vortex appears near the narrow face of the mold. Such a corner-vortex leads to the peak value of inclusion’s concentration, number density and characteristic radius near the narrow face. Numerical results also showed that convective transfer of molten steel is the key factor to influence the inclusion distribution. In the upper recirculation zone, the inclusion has the annular distribution. Wall effect and inclusion’s collision and aggregation are two important factors. Under the mold, the inclusion has the “W” shape distribution in the middle plane and the “8” shape distribution in the horizontal plane. And the inclusion has the “V” shape at the narrow face and symmetry plane under the nozzle.

The effect of gradient high magnetic field on refined structures distribution has been investigated experimentally during electromagnetic vibration of Al. It was found the refining region was influenced by the magnetization force and gravity. A model responsible for the magnetization force—restrain migratation of crystal grains has been proposed based on the classical dynamics, in which the grain is treated as a spheroid. A theoretical expression was derived for the migratation of grain as a function of applied magnetic intensity and gradient. We can achieve micro-gravitational solidification and restrain “crystal shower” under gradient high magnetic field.

According to Heat flow-Temperature curves of DSC and the differential relationship between free energy increment and martensite volume fraction, a new cosine martensitic transformation model of shape memory alloy is developed. Based on the previous work of Tanaka and Liang, a new integral constitutive equation of shape memory alloy is derived. The study illustrates that Liang’s martensitic transformation model and constitutive equation are the special cases of the new martensitic transformation model and constitutive equation respectively. The new martensitic transformation model and constitutive can describe the phase transformation behavior and mechanical behavior of shape memory alloy more precisely than those previous models and equations.

BaCe0.9Y0.1O3-α，BaCe0.85Y0.15O3-α and BaCe0.9Sm0.1O3-α proton conductors were prepared by solid state reaction. X-ray Diffraction(XRD) indicated the powders doped 10%Y were single perovskite phase. The powders doped 15%Y and 10%Sm didn`t have Y2O3 and Sm2O3 respectively. It was concluded that solid sulubility limit of Y is above 0.15 and that of Sm is above 0.10 in BaCeO3. By laser light scattering paticle size analysis indicated that average particle size of powders changed larger and particles that particle size is about 5μm accounted for the most quantitatively after calcination. TG-DSC analysis displayed the sintering temperature of proton conductors was about 1360℃. SEM showed these proton conductors were composed of two particles whose size ranged from 1μm to 10μm. The Dehydrogenation result indicated deydrogenation current getted higher when the temperature of Al melt,water vapor pressure and external voltage getted higher independently. By CaZr0.9In0.1O3-α hydrogen sensor the hydrogen activity was 0.0536 and 0.0445 mlH2/100gAl when the temperature of Al melt was 780℃, PH2O was apart 4122.8Pa and 4366.0Pa.