The thesis studies the microstructure evolution rule during Cu-Sn alloy preparation and processing process and its influence on material performance, provides necessary theoretical support for industrialization development of Cu-Sn contact wire for high-speed railway.
The microstructures and properties of AgCuO composites were researched after severe plastic deformation. The results showed that CuO particles secondly were dispersed along with increasing of true strain. The purpose of microstructure homogenization was achieved. The value of density, tensile strength and resistivity was increasing along. The value of hardness was reduced. The value of the elongation was increasing before true strain 8.0 and decreasing after true strain 8.0 in AgCuO composites.
The volume change of ITO target sintering at different temperature of 1673K,1773K,1793K,1823K,1853K and 1873K were investigated by means of molecular dynamics simulation. The experimental results revealed that the rate of reduction in bulk was very fast in prior period of ITO green sintering process, and it was slow in later period. The atomic model of ITO green got the smallest value of 890.918nm3 at the 1853K, and the ITO green can receive the highest densification at this temperature. The simulation results can provide theoretical direction for ITO target normal pressure sintering method.
The First-principles based on plane-wave pseudo-potentials methods was applied to investigate the lattice parameter, electronic structure and optical property of pure Si doped with transition metal. The calculation result show that the lattice parameter decrease for Si doped with Cr and therefore the more stable structure, Si doped with Sc, Ti, V have opposite trend. Hybrid and electron transfer display intensely for Si doped with Cr from that with Sc, Ti, V. the absorption peak is located at the region of 2.42eV-2.80eV and the absorption coefficient increase intensely for doped Cr system.
Four kinds of fermi energy of lead anode plate were calculated by using first-principles. Different metals and different alloy elements of the fermi energy level were compared, the minimum electrode potential lead base alloy anode materials is known. The results calculations show that the adding alloy elements can reduce the electrode potential of the lead anode plate, four kinds of alloy systems Pb-Ag, Pb-Sb, Pb-Sr, Pb-Sn were calculated, the highest of fermi energy was Pb-Sb alloy. So the Pb-Sb alloy is expected to become the electrode potential minimum lead base alloy anode materials.
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