The Study On One Dimensional Cu-Zn-Al Alloy Nano-structures

Cu-Zn-Al shape memory alloy is a kind of function material with fineperformance and low cost. When we studied it, some new one dimensional alloynano-structures were attained by chance including alloy nanotubes, alloy nanowires,alloy nanorodes, and some zero dimension separated alloy nanoparticals in normaltemperature and pressure . Through a mass of experiments, it was found that the alloynano-structures would be attained when the annealed Cu-Zn-Al alloy was treated bymixed acid include HNO3, HCl, H3PO4, HAC. And it was confirmed that twin-jetelectrolytic polishing and ionization had nothing to do with growth of alloynano-structures by large number of experiments. The alloy nano-structures wereattributed by TEM, SEM and EDX. The outer diameter of nanotubes were about40nm, and their inner diameter were from 10nm to 40nm. The top end of somenanotubes were enclosed by nanoparticals and the others top end were open. Thediameter of nanowires and nanorods were from 10nm to 40nm, and the most length ofnanowires and nanorods were over micron. The grain size of nanoparticals were from10nm to 40nm, and their dispersity were fine. The main ingredients of alloynano-structures were Cu, Zn and Al, and the structures of them were polycrystal.In the process of researching growth mechanics of alloy nano-structures, it wasconfirmed that "quasi-fluid cell", a kind of non-liner oscillation phenomenon in thealloy, was the critical factor. The alloy atoms motion rules of cell were researcheddeeply by metallographic, TEM, SEM, AFM, X-ray and so on. According to theexperimental data, the chaotic movement of the quasi-fluid cell oscillation thim seriesin solid is analyzed, The dynamical system phase space was reconstructed;the systemparameters were calculated, such as Lyapunov exponents, Kolmogorov entropy, andHurst exponents. The results proved that the quasi-fluid is a very complex activity,and it is an obvious process from chaos into order. According to the characters ofquasi-fluid cell such as chaotic, self-organizing and similarity with fluid, the questionsabout where the energy and atoms which composing alloy nano-structures come from,how the alloy nanotubes nucleat and why the atoms can grow directionly could beexplained reasonably. So the grow model of one dimensional alloy nano-structureswere put forward in response to quasi-fluid state.