Study of the fabrication of magnesium matrix composite materials and their mechanical properties after heat treatment
| Autor: | Pin-sen Hong, 洪品森 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 Since the 1990s, the demand of the magnesium and the magnesium alloy has been elevated constantly by taking into account the energy conservation and environmental protection of automobile industry. The magnesium alloy is one kind of the light metal, and its weight is only 23% and 67% relative to the iron and the aluminum, respectively; as far as the thickness is concerned the minimum thickness of magnesium alloy can be achieved to 1.0mm, and the advantages are high specific intensity, resistance effect of vibration, and excellent thermal radiation. Magnesium alloy can be a promising material to be extensively applied on the commodity, aerospace, and automobile industries while the lightweight is taken into account. The magnesium alloy matrix composite materials are superior to the magnesium alloy because of the outstanding mechanical properties. The pellet, short fiber, and continuous filament can be added into the matrix as the particle to make a great compatibility between the matrix and the particle in order to improve the mechanical properties. This research chose the nano-scaled aluminum-oxidation granular materials as the reinforcement particle and used the modified DMD system to integrate the particle with the AZ91D.Subsequently, the melt soup was formed with rapid set, and the different heat treatment procedures were chosen to improve the mechanical properties of the composites. In addition, the mechanical properties and the phenomena would be gained and discussed after the hardness and tensile test. According to the elevation of the weight percentage of the composite added with the reinforcement particle, the consequence is that the hardness is elevated as well. The hardness of the composite added with the particle is declined moderately under the observation of the air cooling and the water cooling. The data of the tensile test presents the ultimate strength of the composite added nano-particle is 189.55 MPa and the air cooling data is high up to 271.86 MPa; the minimum value of the ultimate strength is 191.86 MPa after water cooling. After T6 heat treatment, the hardness is improved to 78.94 HV due to the age effect, and the value of maximum ultimate strength is 254.63 MPa under the condition of the 32hr aging treatment with 1% particles. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|