Study on Hot Extrusion Forming and Thermal Resistance of Magnesium Alloy Heat Sinks
| Autor: | Wen-Yao LI, 李文堯 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 This research mainly focuses on the fabrication of AZ31 and AZ61 heat sinks magnesium alloy parts by hot extrusion. Process parameters considered in this study are heating temperature of billet and extrusion speed. The influence of process parameters on extrusion load is discussed. Meanwhile, extrusion experiments under different process parameters are carried out, the effects of process parameters on mechanical properties of the products are analyzed. The mechanical properties discussed in this study are thermal resistance and bending curvature of magnesium alloy heat sinks. The comparion of thermal resistance of AZ31 and AZ61 magnesium alloys and that of A-6061 aluminum alloys are carried out. Material flow pattern of the billet inside the die cavity is analyzed by using a commercial finite element package“DEFORM 3D”. Stress and strain distribution of material in the die cavity, bending curvature of the products after extrusion are investigated. The experimental results are compared with the analytical values to verify the validity of the proposed analytical models. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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