published_or_final_version / Chemistry / Master / Master of Science

published_or_final_version / Chemistry / Master / Master of Science

Yeung Yeung = 電化學堆積法產生的金屬聚集物之內部結構 / 楊陽. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2006. / Includes bibliographical references. / Text in English; abstracts in English and Chinese. / Yeung Yeung = Dian hua xue dui ji fa chan sheng de jin shu ju ji wu zhi nei bu jie gou / Yang Yang. / Acknowledgement --- p.i / Abstract --- p.ii / 摘要 --- p.iv / Chapter Chapter 1 --- Introduction --- p.1 / Chapter Chapter 2 --- Mechanisms of Metallic Deposition and Dendrite Formation of Electro-chemical Deposition (ECD) / Chapter 2.1 --- Introduction --- p.6 / Chapter 2.2 --- Electrochemical Growth on the Cathode --- p.6 / Chapter 2.3 --- Dendritic Formation --- p.13 / Chapter 2.4 --- Conclusion --- p.14 / Chapter Chapter 3 --- "Studies of ""Ramified"" Structures Obtained by Electro-chemical Deposition (ECD)" / Chapter 3.1 --- Introduction --- p.16 / Chapter 3.2 --- Experimental Setup --- p.17 / Chapter 3.3 --- Results and Discussions --- p.21 / Chapter 3.4 --- Dendrite Obtained by Using Very Thin Cells --- p.38 / Chapter 3.5 --- Dendritic Aggregates Obtained by Using Other Cations --- p.44 / Chapter 3.6 --- Conclusion --- p.53 / Chapter Chapter 4 --- Electro-chemical Deposition of metallic Crystals Using Low Potential Difference / Chapter 4.1 --- Introduction --- p.57 / Chapter 4.2 --- Experimental Setup --- p.58 / Chapter 4.3 --- Results and Discussions --- p.60 / Chapter 4.4 --- Conclusion --- p.68 / Chapter Chapter 5 --- Electro-chemical Deposition in a Vertical Cell / Chapter 5.1 --- Introduction --- p.70 / Chapter 5.2 --- Background Theory --- p.71 / Chapter 5.3 --- Experimental Setup --- p.74 / Chapter 5.4 --- Results and Discussions --- p.76 / Chapter 5.5 --- Conclusion --- p.84 / Chapter Chapter 6 --- Interesting Metallic Aggregates Obtained by Electro-Chemical Deposition / Chapter 6.1 --- Introduction --- p.87 / Chapter 6.2 --- Aggregates Obtained from Thin Gap ECD --- p.87 / Chapter 6.3 --- Dendrites Formed from ECD in Bulk Solutions --- p.92 / Chapter 6.4 --- Concluding Remarks --- p.93 / Chapter Chapter 7 --- Future Outlook --- p.95

Materials which can be changed in shape and size when exposed to a magnetic field are called magnetostrictive materials. The magnetostrictive material was developed for use in the many actuator industries. A single crystal of magnetostrictive material is used to maximize its magnetostrictive response. It can be produced by the crystal growth method. However, a single crystal from this method is limited in size and shape. The growth direction of a single crystal, sometimes, is different from its magnetostrictive axis. Capacitor discharge welding (CDW) is a high power density welding process at 10���-10��� Kelvin/second. The fusion zone of CDW is very small and the heat affected zone of CDW is rarely detectable. The amount of material affected by heat in the welding process is very small. The objective of this study is to use capacitor discharge welding (CDW) to join single crystal copper and determine the effect of CDW on the microstructure of the single crystal copper. To minimize the cost of using single crystal copper, low oxygen copper C101 (polycrystalline) is used as a replacement. By maximizing the weld strength, Response Surface Methodology (RSM) is used to find the optimum condition of single crystal copper. The single crystal copper was cut at different orientations and welded together with the one that had same orientation to compare the results. The metallography was used to study voids, fusion zone and dislocations of the single crystal copper after welding. After analyzing the effect of the CDW process on the single crystal, the effect of crystal orientation upon void formation was found statistically inconclusive. Small fusion zone as 0.09154 mm was found. No heat affected zone of single crystal was detected. Also, no microstructural damage was found along the fusion zone. Dislocation density before and after CDW were not different because there was no statistically significant difference between the etch pit density in the fusion zone and that outside the fusion zone. In summary, regardless of voids, CDW may be a useful method for welding single crystal metals. / Graduation date: 1999

Thesis (M. Sc.)--University of Hong Kong, 1972. / Includes a reprint of a paper entitled Crystal structure of Trichlorobis (tri-n-butylphosphine) trimethylphosphiterhodium (III), by F.H. Allen and others, from Chemical communications, 1970. Offset from typescript.

Thesis (M. Sc.)--University of Hong Kong, 1972. / Includes a reprint of a paper entitled Crystal and molecular structure of tricarbonyl ... by K.K. Cheung and others, from Journal of the Chemical Society, 1970. Offset from typescript.

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Thesis (M.S.)--Youngstown State University, 1972. / Typescript. Includes bibliographical references (leaves 42-44).