Alcufe Department Of Quasicrystals Is Similar To The Phase Formation And Research

Quasicrystal material have aroused many material scientists' interests because of its remarkable high hardness,low friction coefficient,low thermal conductivity,low electric conductivity,oxidation-resistance,erosion-resistance and special optical property.As project supported by Chinese Natural Science Foundation,this dissertation reported the study in preparation Al,Cu,Fe films by means of electrodeposition method on the copper substrate and the formation of AlCuFe quasicrystal or its approximants by solid state diffusion and its morphology,hardness and physical property.In the case of theory analysis,the dissertation summarized the electron structural and atom structural relation between quasicrystals and approximants. It is founded that approximants have the same valence electron concentration as quasicrystals and have local structure of quasicrystals.Meanwhile,excellent Al-Cu-Fe multi-plating layer was obtained by the electrodeposition of aluminium from a molten aluminium chloride-sodium chloride bath,the electrodeposition of iron from FeSC solution and the electrodeposition of copper from CuSO4 solution. The influence of technics parameters on the layer was studied too.Finally,T-AUCug and AlCuFe approximants was prepared by anneal heat-treatment. The influence of iron-copper ratio,temperture and time on the formation of approximants was analyzed. At the same time,we analyzed in detail their morphology and EDS energy spectrum on surface and section place and tested Vickers hardness,specific resistance and magnetism. By those we found Y-AUCug and AlCuFe approximants have high Vickers hardness and high specific resistance and show resist magnetism.